c++ primer plus(第六版)第二至第五章课后编程练习答案

第5章运算符、表达式和语句编程练习1．编写一个程序。

将用分钟表示的时间转换成以小时和分钟表示的时间。

使用#define或者const来创建一个代表60的符号常量。

使用while循环来允许用户重复键入值，并且当键入一个小于等于0的时间时终止循环。

#include<stdio.h>#define HOUR 60int main(void){int minutes;printf("Please input the minutes:");scanf("%d",&minutes);while(minutes>0){printf("%d hours and %d minutes\n",minutes/HOUR,minutes%HOUR);printf("Please input the minutes:");scanf("%d",&minutes);}return(0);}2．编写一个程序，此程序要求输入一整数，然后打印出从（包括）输入的值到（包括）比输入的值大10的所有整数值（也就是说，如果输入为5，那么输出就从5到15）。

要求在各个输出值之间用空格、制表符或换行符分开。

#include<stdio.h>int main(void){int num,i=0;printf("Please input the number:");scanf("%d",&num);while(i++<11)printf("%d ",num++);}return(0);}3．编写一个程序，该程序要求用户输入天数，然后将该值转换为周数和天数。

例如，此程序将把18天转换成2周4天。

用下面的格式显示结果：使用一个while循环让用户重复输入天数；当用户输入一个非正数（如0或-20）时，程序将终止循环。

Chapter 2PE 2-1/* Programming Exercise 2-1 */#include <stdio.h>int main(void){printf("Anton Bruckner\n");printf("Anton\nBruckner\n");printf("Anton ");printf("Bruckner\n");return 0;}PE 2-3/* Programming Exercise 2-3 */#include <stdio.h>int main(void){int ageyears; /* age in years */int agedays; /* age in days *//* large ages may require the long type */ageyears = 44;agedays = 365 * ageyears;printf("An age of %d years is %d days.\n", ageyears, agedays);return 0;}PE 2-4/* Programming Exercise 2-4 */#include <stdio.h>void jolly(void);void deny(void);int main(void){jolly();jolly();jolly();deny();return 0;}void jolly(void){printf("For he's a jolly good fellow!\n");}void deny(void){printf("Which nobody can deny!\n");}PE 2-5/* Programming Exercise 2-5 */#include <stdio.h>int main(void){int toes;toes = 10;printf("toes = %d\n", toes);printf("Twice toes = %d\n", 2 * toes);printf("toes squared = %d\n", toes * toes);return 0;}/* or create two more variables, set them to 2 * toes and toes * toes */PE 2-7/* Programming Exercise 2-7 */#include <stdio.h>void one_three(void);void two(void);int main(void){printf("starting now:\n");one_three();printf("done!\n");return 0;}void one_three(void){printf("one\n");two();printf("three\n");}void two(void){printf("two\n");}Chapter 3PE 3-2/* Programming Exercise 3-2 */#include <stdio.h>int main(void){int ascii;printf("Enter an ASCII code: ");scanf("%d", &ascii);printf("%d is the ASCII code for %c.\n", ascii, ascii);return 0;}PE 3-4/* Programming Exercise 3-4 */#include <stdio.h>int main(void){float num;printf("Enter a floating-point value: ");scanf("%f", &num);printf("fixed-point notation: %f\n", num);printf("exponential notation: %e\n", num);return 0;}PE 3-6/* Programming Exercise 3-6 */#include <stdio.h>int main(void){float mass_mol = 3.0e-23; /* mass of water molecule in grams */ float mass_qt = 950; /* mass of quart of water in grams */ float quarts;float molecules;printf("Enter the number of quarts of water: ");scanf("%f", &quarts);molecules = quarts * mass_qt / mass_mol;printf("%f quarts of water contain %e molecules.\n", quarts,molecules);return 0;}。

Chapter 2PE 2-1/* Programming Exercise 2-1 */#include <stdio.h>int main(void){printf("Anton Bruckner\n");printf("Anton\nBruckner\n");printf("Anton ");printf("Bruckner\n");return 0;}PE 2-3/* Programming Exercise 2-3 */#include <stdio.h>int main(void){int ageyears; /* age in years */int agedays; /* age in days *//* large ages may require the long type */ageyears = 44;agedays = 365 * ageyears;printf("An age of %d years is %d days.\n", ageyears, agedays);return 0;}PE 2-4/* Programming Exercise 2-4 */#include <stdio.h>void jolly(void);void deny(void);int main(void){jolly();jolly();jolly();deny();return 0;}void jolly(void)printf("For he's a jolly good fellow!\n");}void deny(void){printf("Which nobody can deny!\n");}PE 2-5/* Programming Exercise 2-5 */#include <stdio.h>int main(void){int toes;toes = 10;printf("toes = %d\n", toes);printf("Twice toes = %d\n", 2 * toes);printf("toes squared = %d\n", toes * toes);return 0;}/* or create two more variables, set them to 2 * toes and toes * toes */PE 2-7/* Programming Exercise 2-7 */#include <stdio.h>void one_three(void);void two(void);int main(void){printf("starting now:\n");one_three();printf("done!\n");return 0;}void one_three(void){printf("one\n");two();printf("three\n");}void two(void){printf("two\n");}Chapter 3PE 3-2/* Programming Exercise 3-2 */#include <stdio.h>int main(void){int ascii;printf("Enter an ASCII code: ");scanf("%d", &ascii);printf("%d is the ASCII code for %c.\n", ascii, ascii);return 0;}PE 3-4/* Programming Exercise 3-4 */#include <stdio.h>int main(void){float num;printf("Enter a floating-point value: ");scanf("%f", &num);printf("fixed-point notation: %f\n", num);printf("exponential notation: %e\n", num);return 0;}PE 3-6/* Programming Exercise 3-6 */#include <stdio.h>int main(void){float mass_mol = 3.0e-23; /* mass of water molecule in grams */ float mass_qt = 950; /* mass of quart of water in grams */ float quarts;float molecules;printf("Enter the number of quarts of water: ");scanf("%f", &quarts);molecules = quarts * mass_qt / mass_mol;printf("%f quarts of water contain %e molecules.\n", quarts,molecules);return 0;}Chapter 4PE 4-1/* Programming Exercise 4-1 */#include <stdio.h>int main(void){char fname[40];char lname[40];printf("Enter your first name: ");scanf("%s", fname);printf("Enter your last name: ");scanf("%s", lname);printf("%s, %s\n", lname, fname);return 0;}PE 4-4/* Programming Exercise 4-4 */#include <stdio.h>int main(void){float height;char name[40];printf("Enter your height in inches: ");scanf("%f", &height);printf("Enter your name: ");scanf("%s", name);printf("%s, you are %.3f feet tall\n", name, height / 12.0);return 0;}PE 4-6/* Programming Exercise 4-6 */#include <stdio.h>#include <float.h>int main(void){float ot_f = 1.0 / 3.0;double ot_d = 1.0 / 3.0;printf(" float values: ");printf("%.4f %.12f %.16f\n", ot_f, ot_f, ot_f);printf("double values: ");printf("%.4f %.12f %.16f\n", ot_d, ot_d, ot_d);printf("FLT_DIG: %d\n", FLT_DIG);printf("DBL_DIG: %d\n", DBL_DIG);return 0;}Chapter 5PE 5-1/* Programming Exercise 5-1 */#include <stdio.h>int main(void){const int minperhour = 60;int minutes, hours, mins;printf("Enter the number of minutes to convert: ");scanf("%d", &minutes);while (minutes > 0 ){hours = minutes / minperhour;mins = minutes % minperhour;printf("%d minutes = %d hours, %d minutes\n", minutes, hours, mins); printf("Enter next minutes value (0 to quit): ");scanf("%d", &minutes);}printf("Bye\n");return 0;}PE 5-3/* Programming Exercise 5-3 */#include <stdio.h>int main(void){const int daysperweek = 7;int days, weeks, day_rem;printf("Enter the number of days: ");scanf("%d", &days);weeks = days / daysperweek;day_rem = days % daysperweek;printf("%d days are %d weeks and %d days.\n", days, weeks, day_rem);return 0;}PE 5-5/* Programming Exercise 5-5 */#include <stdio.h>int main(void) /* finds sum of first n integers */ {int count, sum;int n;printf("Enter the upper limit: ");scanf("%d", &n);count = 0;sum = 0;while (count++ < n)sum = sum + count;printf("sum = %d\n", sum);return 0;}PE 5-7/* Programming Exercise 5-7 */#include <stdio.h>void showCube(double x);int main(void) /* finds cube of entered number */{double val;printf("Enter a floating-point value: ");scanf("%lf", &val);showCube(val);return 0;}void showCube(double x){printf("The cube of %e is %e.\n", x, x*x*x );}Chapter 6PE 6-1/* pe6-1.c *//* this implementation assumes the character codes *//* are sequential, as they are in ASCII. */#include <stdio.h>#define SIZE 26int main( void ){char lcase[SIZE];int i;for (i = 0; i < SIZE; i++)lcase[i] = 'a' + i;for (i = 0; i < SIZE; i++)printf("%c", lcase[i]);printf("\n");return 0;}PE 6-3/* pe6-3.c *//* this implementation assumes the character codes *//* are sequential, as they are in ASCII. */#include <stdio.h>int main( void ){char let = 'F';char start;char end;for (end = let; end >= 'A'; end--){for (start = let; start >= end; start--)printf("%c", start);printf("\n");}return 0;}PE 6-5/* pe6-5.c */#include <stdio.h>int main( void ){int lower, upper, index;int square, cube;printf("Enter starting integer: ");scanf("%d", &lower);printf("Enter ending integer: ");scanf("%d", &upper);printf("%5s %10s %15s\n", "num", "square", "cube"); for (index = lower; index <= upper; index++){square = index * index;cube = index * square;printf("%5d %10d %15d\n", index, square, cube); }return 0;}6-6 编写一个程序把一个单词读入一个字符数组,然后反向打印出这个词.#include <stdio.h>#include <string.h>int main(void){char word[256];int len;int i;printf("Please input a word(length max is 256):");scanf("%s",word);if((len = strlen(word)) > 256){printf("word is too long...\n");return 0;}printf("The word is %s\n",word);printf("End to start:");for(i=len; i>=0;i--)printf("%c",word[i]);printf("\n");return 0;}PE 6-7/* pe6-7.c */#include <stdio.h>int main( void ){double n, m;double res;printf("Enter a pair of numbers: ");while (scanf("%lf %lf", &n, &m) == 2){res = (n - m) / (n * m);printf("(%.3g - %.3g)/(%.3g*%.3g) = %.5g\n", n, m, n, m, res); printf("Enter next pair (non-numeric to quit): ");}return 0;}PE 6-10/* pe6-10.c */#include <stdio.h>#define SIZE 8int main( void ){int vals[SIZE];int i;printf("Please enter %d integers.\n", SIZE);for (i = 0; i < SIZE; i++)scanf("%d", &vals[i]);printf("Here, in reverse order, are the values you entered:\n"); for (i = SIZE - 1; i > 0; i--)printf("%d ", vals[i]);printf("\n");return 0;}PE 6-12/* pe6-12.c *//* This version starts with the 0 power */#include <stdio.h>#define SIZE 8int main( void ){int twopows[SIZE];int i;int value = 1; /* 2 to the 0 */for (i = 0; i < SIZE; i++){twopows[i] = value;value *= 2;}i = 0;do{printf("%d ", twopows[i]);i++;} while (i < SIZE);printf("\n");return 0;}PE 6-13/* pe-13.c *//* Programming Exercise 6-13 */#include <stdio.h>#define SIZE 8int main(void){double arr[SIZE];double arr_cumul[SIZE];int i;printf("Enter %d numbers:\n", SIZE);for (i = 0; i < SIZE; i++){printf("value #%d: ", i + 1);scanf("%lf", &arr[i]);/* or scanf("%lf", arr + i); */}arr_cumul[0] = arr[0]; /* set first element */for (i = 1; i < SIZE; i++)arr_cumul[i] = arr_cumul[i-1] + arr[i];for (i = 0; i < SIZE; i++)printf("%8g ", arr[i]);printf("\n");for (i = 0; i < SIZE; i++)printf("%8g ", arr_cumul[i]);printf("\n");return 0;}PE 6-15/* pe6-15.c */#include <stdio.h>#define RATE_SIMP 0.10#define RATE_COMP 0.05#define INIT_AMT 100.0int main( void ){double daphne = INIT_AMT;double deidre = INIT_AMT;int years = 0;while (deidre <= daphne){daphne += RATE_SIMP * INIT_AMT;deidre += RATE_COMP * deidre;++years;}printf("Investment values after %d years:\n", years); printf("Daphne: $%.2f\n", daphne);printf("Deidre: $%.2f\n", deidre);return 0;}Chapter 7PE 7-1/* Programming Exercise 7-1 */#include <stdio.h>int main(void){char ch;int sp_ct = 0;int nl_ct = 0;int other = 0;while ((ch = getchar()) != '#'){if (ch == ' ')sp_ct++;else if (ch == '\n')nl_ct++;elseother++;}printf("spaces: %d, newlines: %d, others: %d\n", sp_ct, nl_ct, other);return 0;}PE 7-3/* Programming Exercise 7-3 */#include <stdio.h>int main(void){int n;double sumeven = 0.0;int ct_even = 0;double sumodd = 0.0;int ct_odd = 0;while (scanf("%d", &n) == 1 && n != 0){if (n % 2 == 1){sumodd += n;++ct_odd;}else{sumeven += n;++ct_even;}}printf("Number of evens: %d", ct_even);if (ct_even > 0)printf(" average: %g", sumeven / ct_even);putchar('\n');printf("Number of odds: %d", ct_odd);if (ct_odd > 0)printf(" average: %g", sumodd / ct_odd);putchar('\n');printf("\ndone\n");return 0;}PE 7-5/* Programming Exercise 7-5 */#include <stdio.h>int main(void){char ch;int ct1 = 0;int ct2 = 0;while ((ch = getchar()) != '#'){switch(ch){case '.' : putchar('!');++ct1;break;case '!' : putchar('!');putchar('!');++ct2;break;default : putchar(ch);}}printf("%d replacements of . with !\n", ct1);printf("%d replacements of ! with !!\n", ct2);return 0;}PE 7-7/* Programming Exercise 7-7 */#include <stdio.h>#define BASEPAY 10 /* $10 per hour */ #define BASEHRS 40 /* hours at basepay */ #define OVERTIME 1.5 /* 1.5 time */ #define AMT1 300 /* 1st rate tier */ #define AMT2 150 /* 2st rate tier */ #define RATE1 0.15 /* rate for 1st tier */ #define RATE2 0.20 /* rate for 2nd tier */ #define RATE3 0.25 /* rate for 3rd tier */ int main(void){double hours;double gross;double net;double taxes;printf("Enter the number of hours worked this week: ");scanf("%lf", &hours);if (hours <= BASEHRS)gross = hours * BASEPAY;elsegross = BASEHRS * BASEPAY + (hours - BASEHRS) * BASEPAY * OVERTIME; if (gross <= AMT1)taxes = gross * RATE1;else if (gross <= AMT1 + AMT2)taxes = AMT1 * RATE1 + (gross - AMT1) * RATE2;elsetaxes = AMT1 * RATE1 + AMT2 * RATE2 + (gross - AMT1 - AMT2) * RATE3; net = gross - taxes;printf("gross: $%.2f; taxes: $%.2f; net: $%.2f\n", gross, taxes, net);return 0;}PE 7-9/* Programmming Exercise 7-9 */#include <stdio.h>#define NO 0#define YES 1int main(void){long num; /* value to be checked */long div; /* potential divisors */long lim; /* limit to values */int prime;printf("Please enter limit to values to be checked; ");printf("Enter q to quit.\n");while (scanf("%ld", &lim) == 1 && lim > 0){for (num = 2; num <= lim; num++){for (div = 2, prime = YES; (div * div) <= num; div++)if (num % div == 0)prime = NO; /* number is not prime */if (prime == YES)printf("%ld is prime.\n", num);}printf("Please enter another limit; ");printf("Enter q to quit.\n");}return 0;}PE 7-11/* pe7-11.c *//* Programming Exercise 7-11 */#include <stdio.h>#include <ctype.h>int main(void){const double price_artichokes = 1.25;const double price_beets = 0.65;const double price_carrots = 0.89;const double DISCOUNT_RATE = 0.05;char ch;double lb_artichokes;double lb_beets;double lb_carrots;double lb_total;double cost_artichokes;double cost_beets;double cost_carrots;double cost_total;double final_total;double discount;double shipping;printf("Enter a to buy artichokes, b for beets, ");printf("c for carrots, q to quit: ");while ((ch = getchar()) != 'q' && ch != 'Q'){if (ch == '\n')continue;while (getchar() != '\n')continue;ch = tolower(ch);switch (ch){case 'a' : printf("Enter pounds of artichokes: "); scanf("%lf", &lb_artichokes);break;case 'b' : printf("Enter pounds of beets: ");scanf("%lf", &lb_beets);break;case 'c' : printf("Enter pounds of carrots: ");scanf("%lf", &lb_carrots);break;default : printf("%c is not a valid choice.\n");}printf("Enter a to buy artichokes, b for beets, ");printf("c for carrots, q to quit: ");}cost_artichokes = price_artichokes * lb_artichokes;cost_beets = price_beets * lb_beets;cost_carrots = price_carrots * lb_carrots;cost_total = cost_artichokes + cost_beets + cost_carrots; lb_total = lb_artichokes + lb_beets + lb_carrots;if (lb_total <= 0)shipping = 0.0;else if (lb_total < 5.0)shipping = 3.50;else if (lb_total < 20)shipping = 10.0;elseshipping = 8.0 + 0.1 * lb_total;if (cost_total > 100.0)discount = DISCOUNT_RATE * cost_total;elsediscount = 0.0;final_total = cost_total + shipping - discount;printf("Your order:\n");printf("%.2f lbs of artichokes at $%.2f per pound:$ %.2f\n",lb_artichokes, price_artichokes, cost_artichokes); printf("%.2f lbs of beets at $%.2f per pound: $%.2f\n",lb_beets, price_beets, cost_beets);printf("%.2f lbs of carrots at $%.2f per pound: $%.2f\n",lb_carrots, price_carrots, cost_carrots);printf("Total cost of vegetables: $%.2f\n", cost_total);if (cost_total > 100)printf("Volume discount: $%.2f\n", discount);printf("Shipping: $%.2f\n", shipping);printf("Total charges: $%.2f\n", final_total);return 0;}Chapter 8PE 8-1/* Programming Exercise 8-1 */#include <stdio.h>int main(void){int ch;int ct = 0;while ((ch = getchar()) != EOF)ct++;printf("%d characters read\n", ct);return 0;}PE 8-3/* Programming Exercise 8-3 *//* Using ctype.h eliminates need to assume ASCII coding */#include <stdio.h>#include <ctype.h>int main(void){int ch;int uct = 0;int lct = 0;while ((ch = getchar()) != EOF)if (isupper(ch))uct++;else if (islower(ch))lct++;printf("%d uppercase characters read\n", uct);printf("%d lowercase characters read\n", lct);return 0;}/*or you could useif (ch >= 'A' && ch <= 'Z')uct++;else if (ch >= 'a' && ch <= 'z')lct++;*/PE 8-5/* Programming Exercise 8-5 *//* binaryguess.c -- an improved number-guesser */#include <stdio.h>#include <ctype.h>int main(void){int high = 100;int low = 1;int guess = (high + low) / 2;char response;printf("Pick an integer from 1 to 100. I will try to guess ");printf("it.\nRespond with a y if my guess is right, with");printf("\na h if it is high, and with an l if it is low.\n");printf("Uh...is your number %d?\n", guess);while ((response = getchar()) != 'y') /* get response */{if (response == '\n')continue;if (response != 'h' && response != 'l'){printf("I don't understand that response. Please enter h for\n"); printf("high, l for low, or y for correct.\n");continue;}if (response == 'h')high = guess - 1;else if (response == 'l')low = guess + 1;guess = (high + low) / 2;printf("Well, then, is it %d?\n", guess);}printf("I knew I could do it!\n");return 0;}PE 8-7/* Programming Exercise 8-7 */#include <stdio.h>#include <ctype.h>#define BASEPAY1 8.75 /* $8.75 per hour */#define BASEPAY2 9.33 /* $9.33 per hour */#define BASEPAY3 10.00 /* $10.00 per hour */#define BASEPAY4 11.20 /* $11.20 per hour */#define BASEHRS 40 /* hours at basepay */#define OVERTIME 1.5 /* 1.5 time */#define AMT1 300 /* 1st rate tier */#define AMT2 150 /* 2st rate tier */#define RATE1 0.15 /* rate for 1st tier */#define RATE2 0.20 /* rate for 2nd tier */#define RATE3 0.25 /* rate for 3rd tier */int getfirst(void);void menu(void);int main(void){double hours;double gross;double net;double taxes;double pay;char response;menu();while ((response = getfirst()) != 'q'){if (response == '\n') /* skip over newlines */continue;response = tolower(response); /* accept A as a, etc. */switch (response){case 'a' : pay = BASEPAY1; break;case 'b' : pay = BASEPAY2; break;case 'c' : pay = BASEPAY3; break;case 'd' : pay = BASEPAY4; break;default : printf("Please enter a, b, c, d, or q.\n");menu();continue; /* go to beginning of loop */}printf("Enter the number of hours worked this week: ");scanf("%lf", &hours);if (hours <= BASEHRS)gross = hours * pay;elsegross = BASEHRS * pay + (hours - BASEHRS) * pay * OVERTIME;if (gross <= AMT1)taxes = gross * RATE1;else if (gross <= AMT1 + AMT2)taxes = AMT1 * RATE1 + (gross - AMT1) * RATE2;elsetaxes = AMT1 * RATE1 + AMT2 * RATE2 + (gross - AMT1 - AMT2) * RATE3;net = gross - taxes;printf("gross: $%.2f; taxes: $%.2f; net: $%.2f\n", gross, taxes, net);menu();}printf("Done.\n");return 0;}void menu(void){printf("********************************************************""*********\n");printf("Enter the number corresponding to the desired pay rate"" or action:\n");printf("a) $%4.2f/hr b) $%4.2f/hr\n", BASEPAY1, BASEPAY2);printf("c) $%5.2f/hr d) $%5.2f/hr\n", BASEPAY3,BASEPAY4);printf("q) quit\n");printf("********************************************************" "*********\n");}int getfirst(void){int ch;ch = getchar();while (isspace(ch))ch = getchar();while (getchar() != '\n')continue;return ch;}Chapter 9PE 9-1/* Programming Exercise 9-1 */#include <stdio.h>double min(double a, double b);int main(void){double x, y;printf("Enter two numbers (q to quit): ");while (scanf("%lf %lf", &x, &y) == 2){printf("The smaller number is %f.\n", min(x,y));printf("Next two values (q to quit): ");}printf("Bye!\n");return 0;}double min(double a, double b){return a < b ? a : b;}/* alternative implementationdouble min(double a, double b){if (a < b)return a;elsereturn b;}*/PE 9-3/* Programming Exercise 9-3 */#include <stdio.h>void chLineRow(char ch, int c, int r);int main(void){char ch;int col, row;printf("Enter a character (# to quit): ");while ( (ch = getchar()) != '#'){if (ch == '\n')continue;printf("Enter number of columns and number of rows: "); if (scanf("%d %d", &col, &row) != 2)break;chLineRow(ch, col, row);printf("\nEnter next character (# to quit): ");}printf("Bye!\n");return 0;}void chLineRow(char ch, int c, int r){int col, row;for (row = 0; row < r ; row++){for (col = 0; col < c; col++)putchar(ch);putchar('\n');}return;}PE 9-5/* Programming Exercise 9-5 */#include <stdio.h>void larger_of(double *p1, double *p2);int main(void){double x, y;printf("Enter two numbers (q to quit): ");while (scanf("%lf %lf", &x, &y) == 2){larger_of(&x, &y);printf("The modified values are %f and %f.\n", x, y);printf("Next two values (q to quit): ");}printf("Bye!\n");return 0;}void larger_of(double *p1, double *p2){double temp = *p1 > *p2 ? *p1 : *p2;*p1= *p2 = temp;}PE 9-7/* Programming Exercise 9-7 */#include <stdio.h>double power(double a, int b); /* ANSI prototype */int main(void){double x, xpow;int n;printf("Enter a number and the integer power");printf(" to which\nthe number will be raised. Enter q");printf(" to quit.\n");while (scanf("%lf%d", &x, &n) == 2){xpow = power(x,n); /* function call */printf("%.3g to the power %d is %.5g\n", x, n, xpow);printf("Enter next pair of numbers or q to quit.\n");}printf("Hope you enjoyed this power trip -- bye!\n");return 0;}double power(double a, int b) /* function definition */{double pow = 1;int i;if (b == 0){if (a == 0)printf("0 to the 0 undefined; using 1 as the value\n"); pow = 1.0;}else if (a == 0)pow = 0.0;else if (b > 0)for(i = 1; i <= b; i++)pow *= a;else /* b < 0 */pow = 1.0 / power(a, - b);return pow; /* return the value of pow */}PE 9-9/* Programming Exercise 9-9 */#include <stdio.h>void to_base_n(int x, int base);int main(void){int number;int b;printf("Enter an integer (q to quit):\n");while (scanf("%d", &number) == 1){printf("Enter number base (2-10): ");scanf("%d", &b);printf("Base %d equivalent: ", b);to_base_n(number, b);putchar('\n');printf("Enter an integer (q to quit):\n");}return 0;}void to_base_n(int x, int base) /* recursive function */{int r;r = x % base;if (x >= 2)to_base_n(x / base, base);putchar('0' + r);return;}Chapter 10PE 10-1/* Programming Exercise 10-1 */#include <stdio.h>#define MONTHS 12 /* number of months in a year */#define YRS 5 /* number of years of data */int main(void){/* initializing rainfall data for 1990 - 1994 */const float rain[YRS][MONTHS] = {{10.2, 8.1, 6.8, 4.2, 2.1, 1.8, 0.2, 0.3, 1.1, 2.3, 6.1, 7.4}, {9.2, 9.8, 4.4, 3.3, 2.2, 0.8, 0.4, 0.0, 0.6, 1.7, 4.3, 5.2}, {6.6, 5.5, 3.8, 2.8, 1.6, 0.2, 0.0, 0.0, 0.0, 1.3, 2.6, 4.2}, {4.3, 4.3, 4.3, 3.0, 2.0, 1.0, 0.2, 0.2, 0.4, 2.4, 3.5, 6.6}, {8.5, 8.2, 1.2, 1.6, 2.4, 0.0, 5.2, 0.9, 0.3, 0.9, 1.4, 7.2} };int year, month;float subtot, total;printf(" YEAR RAINFALL (inches)\n");for (year = 0, total = 0; year < YRS; year++){ /* for each year, sum rainfall for each month */ for (month = 0, subtot = 0; month < MONTHS; month++)subtot += *(*(rain + year) + month);printf("%5d %15.1f\n", 1990 + year, subtot);total += subtot; /* total for all years */}printf("\nThe yearly average is %.1f inches.\n\n", total/YRS);printf("MONTHLY AVERAGES:\n\n");printf(" Jan Feb Mar Apr May Jun Jul Aug Sep Oct ");printf(" Nov Dec\n");for (month = 0; month < MONTHS; month++){ /* for each month, sum rainfall over years */for (year = 0, subtot =0; year < YRS; year++)subtot += *(*(rain + year) + month);printf("%4.1f ", subtot/YRS);}printf("\n");return 0;}PE 10-3/* Programming Exercise 10-3 */#include <stdio.h>#define LEN 10int max_arr(const int ar[], int n);void show_arr(const int ar[], int n);int main(void){int orig[LEN] = {1,2,3,4,12,6,7,8,9,10};int max;show_arr(orig, LEN);max = max_arr(orig, LEN);printf("%d = largest value\n", max);return 0;}int max_arr(const int ar[], int n){int i;int max = ar[0];/* don't use 0 as initial max value -- fails if all array values are neg */ for (i = 1; i < n; i++)if (max < ar[i])max = ar[i];return max;}void show_arr(const int ar[], int n){int i;for (i = 0; i < n; i++)printf("%d ", ar[i]);putchar('\n');}PE 10-5/* Programming Exercise 10-5 */#include <stdio.h>#define LEN 10float max_diff(const float ar[], int n);void show_arr(const float ar[], int n);int main(void){float orig[LEN] = {1.1,2,3,4,12,6,7,8,9,10}; float max;show_arr(orig, LEN);max = max_diff(orig, LEN);printf("%g = maximum difference\n", max);return 0;}float max_diff(const float ar[], int n){int i;float max = ar[0];float min = ar[0];for (i = 1; i < n; i++){if (max < ar[i])max = ar[i];else if (min > ar[i])min = ar[i];}return max - min;}void show_arr(const float ar[], int n){int i;for (i = 0; i < n; i++)printf("%g ", ar[i]);putchar('\n');}PE 10-7/* Programming Exercise 10-7 */#include <stdio.h>#define LEN1 7#define LEN2 3void copy_arr(int ar1[], const int ar2[], int n); void show_arr(const int ar[], int n);int main(void){int orig[LEN1] = {1,2,3,4,5,6,7};int copy[LEN2];。

Chapter 2// pe2-2.cpp#include <iostream>int main(void){using namespace std;cout << "Enter a distance in furlongs: "; double furlongs;cin >> furlongs;double feet;feet = 220 * furlongs;cout << furlongs << " furlongs = "<< feet << " feet\n";return 0;}// pe2-3.cpp#include <iostream>using namespace std;void mice();void run();int main(){mice();mice();run();run();return 0;}void mice(){cout << "Three blind mice\n";}void run(){cout << "See how they run\n";}// pe2-4.cpp#include <iostream>double C_to_F(double);int main(){using namespace std;cout << "Enter a temperature in Celsius: ";double C;cin >> C;double F;F = C_to_F(C);cout << C << " degrees Celsius = "<< F << " degrees Fahrenheit\n";return 0;}double C_to_F(double temp){return 1.8 * temp + 32.0;}Chapter 3// pe3-1.cpp#include <iostream>const int Inch_Per_Foot = 12;int main(void){using namespace std;// Note: some environments don't support the backspace character cout << "Please enter your height in inches: ___/b/b/b ";int ht_inch;cin >> ht_inch;int ht_feet = ht_inch / Inch_Per_Foot;int rm_inch = ht_inch % Inch_Per_Foot;cout << "Your height is " << ht_feet << " feet, ";cout << rm_inch << " inch(es).\n";return 0;}// pe3-3.cpp#include <iostream>const double MINS_PER_DEG = 60.0;const double SECS_PER_MIN = 60.0;int main(){using namespace std;int degrees;int minutes;int seconds;double latitude;cout << "Enter a latitude in degrees, minutes, and seconds:\n";cout << "First, enter the degrees: ";cin >> degrees;cout << "Next, enter the minutes of arc: ";cin >> minutes;cout << "Finally, enter the seconds of arc: ";cin >> seconds;latitude = degrees + (minutes + seconds / SECS_PER_MIN)/MINS_PER_DEG; cout << degrees << " degrees, " << minutes << " minutes, "<< seconds << " seconds = " << latitude << " degrees\n";return 0;}// pe3-5.cpp#include <iostream>int main(void){using namespace std;cout << "How many miles have you driven your car? ";float miles;cin >> miles;cout << "How many gallons of gasoline did the car use? ";float gallons;cin >> gallons;cout << "Your car got " << miles / gallons;cout << " miles per gallon.\n";return 0;}// pe3-6.cpp#include <iostream>const double KM100_TO_MILES = 62.14;const double LITERS_PER_GALLON = 3.875;int main ( void ){using namespace std;double euro_rating;double us_rating;cout << "Enter fuel consumption in liters per 100 km: ";cin >> euro_rating;// divide by LITER_PER_GALLON to get gallons per 100-km// divide by KM100_TO_MILES to get gallons per mile// invert result to get miles per gallonus_rating = (LITERS_PER_GALLON * KM100_TO_MILES) / euro_rating;cout << euro_rating << " liters per 100 km is ";cout << us_rating << " miles per gallon.\n";return 0;}Chapter 4// pe4-2.cpp -- storing strings in string objects#include <iostream>#include <string>int main(){using namespace std;string name;string dessert;cout << "Enter your name:\n";getline(cin, name); // reads through newlinecout << "Enter your favorite dessert:\n";getline(cin, dessert);cout << "I have some delicious " << dessert;cout << " for you, " << name << ".\n";return 0;}// pe4-3.cpp -- storing strings in char arrays#include <iostream>#include <cstring>const int SIZE = 20;int main(){using namespace std;char firstName[SIZE];char lastName[SIZE];char fullName[2*SIZE + 1];cout << "Enter your first name: ";cin >> firstName;cout << "Enter your last name: ";cin >> lastName;strncpy(fullName,lastName,SIZE);strcat(fullName, ", ");strncat(fullName, firstName, SIZE);fullName[SIZE - 1] = '\0';cout << "Here's the information in a single string: " << fullName << endl;return 0;}// pe4-5.cpp// a candybar structurestruct CandyBar {char brand[40];double weight;int calories;};#include <iostream>int main(){using namespace std; //introduces namespace stdCandyBar snack = { "Mocha Munch", 2.3, 350 };cout << "Brand name: " << snack.brand << endl;cout << "Weight: " << snack.weight << endl;cout << "Calories: " << snack.calories << endl;return 0;}// p#include <iostream>const int Slen = 70;struct pizza {char name[Slen];float diameter;float weight;};int main(void){using namespace std;pizza pie;cout << "What is the name of the pizza company? ";cin.getline(, Slen);cout << "What is the diameter of the pizza in inches? "; cin >> pie.diameter;cout << "How much does the pizza weigh in ounces? ";cin >> pie.weight;cout << "Company: " << << "\n";cout << "Diameter: " << pie.diameter << " inches\n";cout << "Weight: " << pie.weight << " ounces\n";return 0;}Chapter 5// pe5-2.cpp#include <iostream>int main(void){using namespace std;double sum = 0.0;double in;cout << "Enter a number (0 to terminate) : ";cin >> in;while (in != 0) {sum += in;cout << "Running total = " << sum << "\n";cout << "Enter next number (0 to terminate) : ";cin >> in;}cout << "Bye!\n";return 0;}// pe5-4.cpp// book sales#include <iostream>const int MONTHS = 12;const char * months[MONTHS] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};int main(){using namespace std; //introduces namespace stdint sales[MONTHS];int month;cout << "Enter the monthly sales for \"C++ for Fools\":\n";for (month = 0; month < MONTHS; month++){cout << "Sales for " << months[month] << ": ";cin >> sales[month];}double total = 0.0;for (month = 0; month < MONTHS; month++)total += sales[month];cout << "Total sales: " << total << endl;return 0;}// pe5-6.cpp#include <iostream>struct car { char name[20]; int year;};int main(void){using namespace std;int n;cout << "How many cars do you wish to catalog?: ";cin >> n;while(cin.get() != '\n') // get rid of rest of line;car * pc = new car [n];int i;for (i = 0; i < n; i++){cout << "Car #" << (i + 1) << ":\n";cout << "Please enter the make: ";cin.getline(pc[i].name,20);cout << "Please enter the year made: ";cin >> pc[i].year;while(cin.get() != '\n') // get rid of rest of line ;}cout << "Here is your collection:\n";for (i = 0; i < n; i++)cout << pc[i].year << " " << pc[i].name << "\n";delete [] pc;return 0;}// pe5-7.cpp -- count words using C-style string#include <iostream>#include <cstring> // prototype for strcmp()const int STR_LIM = 50;int main(){using namespace std;char word[STR_LIM];int count = 0;cout << "Enter words (to stop, type the word done):\n";while (cin >> word && strcmp("done", word))++count;cout << "You entered a total of " << count << " words.\n"; return 0;}// pe5-9.cpp//nested loops#include <iostream>int main(){using namespace std; //introduces namespace stdint rows;int row;int col;int periods;cout << "Enter number of rows: ";cin >> rows;for (row = 1; row <= rows; row++){periods = rows - row;for (col = 1; col <= periods; col++)cout << '.';// col already has correct value for next loopfor ( ; col <= rows; col++)cout << '*';cout << endl;}return 0;}Chapter 6// pe6-1.cpp#include <iostream>#include <cctype>int main( ){using namespace std; //introduces namespace stdchar ch;cin.get(ch);while(ch != '@'){if (!isdigit(ch)){if (isupper(ch))ch = tolower(ch);else if (islower(ch))ch = toupper(ch);cout << ch;}cin.get(ch);}return 0;}// pe6-3.cpp#include <iostream>int main(void){using namespace std;cout << "Please enter one of the following choices:\n";cout << "c) carnivore p) pianist\n"<< "t) tree g) game\n";char ch;cin >> ch;while (ch != 'c' && ch != 'p' && ch != 't' && ch != 'g'){cout << "Please enter a c, p, t, or g: ";cin >> ch;}switch (ch){case 'c' : cout << "A cat is a carnivore.\n";break;case 'p' : cout << "Radu Lupu is a pianist.\n";break;case 't' : cout << "A maple is a tree.\n";break;case 'g' : cout << "Golf is a game.\n";break;default : cout << "The program shouldn't get here!\n"; }return 0;}// pe6-5.cpp// Neutronia taxation#include <iostream>const double LEV1 = 5000;const double LEV2 = 15000;const double LEV3 = 35000;const double RATE1 = 0.10;const double RATE2 = 0.15;const double RATE3 = 0.20;int main( ){using namespace std;double income;double tax;cout << "Enter your annual income in tvarps: ";cin >> income;if (income <= LEV1)tax = 0;else if (income <= LEV2)tax = (income - LEV1) * RATE1;else if (income <= LEV3)tax = RATE1 * (LEV2 - LEV1) + RATE2 * (income - LEV2); elsetax = RATE1 * (LEV2 - LEV1) + RATE2 * (LEV3 - LEV2)+ RATE3 * (income - LEV3);。

C PRIMER PLUS 第五章正确答案.txtPE 5-1/* Programming Exercise 5-1 */#include <stdio.h>int main(void){const int minperhour = 60;int minutes, hours, mins;printf("Enter the number of minutes to convert: ");scanf("%d", &minutes);while (minutes > 0 ){hours = minutes / minperhour;mins = minutes % minperhour;printf("%d minutes = %d hours, %d minutes\n", minutes, hours, mins);printf("Enter next minutes value (0 to quit): ");scanf("%d", &minutes);}printf("Bye\n");return 0;}PE 5-3/* Programming Exercise 5-3 */#include <stdio.h>int main(void){const int daysperweek = 7;int days, weeks, day_rem;printf("Enter the number of days: ");scanf("%d", &days);weeks = days / daysperweek;day_rem = days % daysperweek;printf("%d days are %d weeks and %d days.\n", days, weeks, day_rem);return 0;}PE 5-5/* Programming Exercise 5-5 */#include <stdio.h>int main(void) /* finds sum of first n integers */ {int count, sum;int n;printf("Enter the upper limit: ");scanf("%d", &n);count = 0;sum = 0;while (count++ < n)sum = sum + count;printf("sum = %d\n", sum);return 0;}PE 5-7/* Programming Exercise 5-7 */#include <stdio.h>void showCube(double x);int main(void) /* finds cube of entered number */{double val;printf("Enter a floating-point value: ");scanf("%lf", &val);showCube(val);return 0;}void showCube(double x){printf("The cube of %e is %e.\n", x, x*x*x );}#include <stdio.h>void Temperatures(double f);int main (void) {double a;printf("input a float Fahrenheit ,and this program will output centigrade and kelvin\n");printf("enter q or other character to quit\n");while(scanf("%lf",&a) == 1) {Temperatures((double)a);}printf("done!\n");return 0;}void Temperatures(double f) {double c,k;c = 1.8 * f + 32.0;k = c + 273.16;printf("%.2f f = %.2f c = %.2f k\n",f,c,k);}。

C Primer Plus第六版中文版习题答案Github: /zhayujie/C-Primer-Plus第一章1.#include <stdio.h>int main(void) {double inch, cm;printf("Please input the inches: ");scanf("%lf", &inch);cm = inch * 2.54;printf("%g cm\n", cm);return 0;}第二章3.#include<stdio.h>int main(void){int days,years=21;days=years*365;printf("我的年龄是%d岁，%d天\n",years,days);return 0;}4.#include<stdio.h>void jolly(void);void deny(void);int main(void){jolly();jolly();deny();return 0;}void jolly(void){printf("For he's a jolly good fellow!\n"); }void deny(void){printf("Which nobody can deny!\n");}5.#include<stdio.h>void br(void);void ic(void);int main(void){br();printf(",");ic();printf("\n");ic();printf("\n");br();printf("\n");return 0;}void br(void){printf("Brazil,Russia");}void ic(void){printf("India,China");}6.#include<stdio.h>int main(void){int toes=10;int toes_2,toes2;toes_2=2*toes;toes2=toes*toes;printf("toes是%d,toes的两倍是%d,toes的平方是%d\n",toes,toes_2,toes2); return 0;}8.#include<stdio.h>void one_three(void);void two(void);int main(void){printf("starting now\n");one_three();}void one_three(void){printf("one\n");two();printf("three\n");printf("done!\n");}void two(void){printf("two\n");}第三章2.#include<stdio.h>int main(void){char ch;printf("please input a number:");scanf("%d",&ch);printf("%c\n",ch);return 0;}4.#include<stdio.h>int main(void){float a;printf("Enter a floating-point value: ");scanf("%f",&a);printf("fixed-point notation: %f\n",a);printf("exponential notation: %e\n",a);return 0;}5.#include<stdio.h>int main(void){int age;double seconds;printf("please input your age: ");scanf("%d",&age);seconds=age*3.156e7;printf("the corresponding seconds are: %e\n",seconds);return 0;}7.#include<stdio.h>int main(void){float inches,cms;printf("input your height(inch): ");scanf("%f",&inches);cms=inches*2.54;printf("your height(cm): %f\n",cms);return 0;}8.#include<stdio.h>int main(void){float pint,ounce,soupspoon,teaspoon,cup;printf("input the number of cups: ");scanf("%f",&cup);pint=cup/2;ounce=cup*8;soupspoon=ounce*2;teaspoon=soupspoon*3;printf("they are equivalent of:\n%f pint\n%f ounce\n%f soupspoons\n%f teaspoons\n",pint,ounce,soupspoon,teaspoon);return 0;}第四章1.#include<stdio.h>int main(void){char firstname[40],lastname[40];printf("Input your firstname: ");scanf("%s",firstname);printf("Input your lastname: ");scanf("%s",lastname);printf("Your name is %s,%s\n",firstname,lastname);return 0;}2.#include<stdio.h>#include<string.h>int main(void){char name[40];int width;printf("Input your name: ");scanf("%s",name);width=strlen(name)+3;printf("%*s\n",width,name); //输入的名和姓中间不能分隔return 0;}4.#include<stdio.h>int main(void){float height;char name[40];printf("Input your height(cm) and name: ");scanf("%f%s",&height,name);height=height/100;printf("%s, you are %.3fm tall\n",name,height);return 0;}5.#include<stdio.h>int main(void){float speed,size,time;printf("Input the download speed(Mb/s) and the file size(MB):\n"); scanf("%f%f",&speed,&size);time=size/speed*8.0;printf("At %.2f megabits per second, a file of %.2f megabytes\n",speed,size);printf("downloads in %.2f seconds.\n",time);return 0;}6.#include<stdio.h>#include<string.h>int main(void){char firstname[40],lastname[40];printf("Input your firstname: ");scanf("%s",firstname);printf("Input your lastname: ");scanf("%s",lastname);printf("%s %s\n",firstname,lastname);printf("%*d %*d\n",strlen(firstname),strlen(firstname),strlen(lastname),strlen(lastname)); printf("%s %s\n",firstname,lastname);printf("%*d %*d\n",-strlen(firstname),strlen(firstname),-strlen(lastname),strlen(lastname) );return 0;}7.#include<stdio.h>#include<float.h>int main(void){double a=1.0/3.0;float b=1.0/3.0;printf("%.6f %.6f\n",a,b); //左侧double型右侧float型printf("%.12f, %.12f\n",a,b);printf("%.16f, %.16f\n",a,b);printf("DBL_DIG: %d\n",DBL_DIG);printf("FLT_DIG: %d\n",FLT_DIG);return 0;}8.#include<stdio.h>#define GALLON 3.758 //1 gallon=3.785 liters#define MILE 1.609 //1 mile=1.609 kilometersint main(void){float gallon,mile;printf("Input miles and gallons: ");scanf("%f%f",&mile,&gallon);printf("Miles per gallon: %.1f\n",mile/gallon);printf("Litre per 100 kilometers: %.1f\n",gallon*GALLON/(mile*MILE)*100);return 0;}第五章1.#include<stdio.h>#define H_P_M 60 //1h=60minint main(void){int hour,min,left;printf("Enter the number of minutes: ");scanf("%d",&min);while(min>0){hour=min/H_P_M;left=min%H_P_M;printf("%d minutes is %d hours and %d minutes.\n",min,hour,left); printf("Enter your next value: ");scanf("%d",&min);}printf("Good bye!\n");return 0;}2.#include<stdio.h>int main(void){int num,count;printf("Input a integer: ");scanf("%d",&num);count=0;while(count++<11){printf("%d ",num);num++;}printf("\n");return 0;}3.#include<stdio.h>#define DAYS_PER_WEEK 7 //一周7天int main(void){int day,week,left;printf("Input the number of days: ");scanf("%d",&day);while(day>0){week=day/DAYS_PER_WEEK;left=day%DAYS_PER_WEEK;printf("%d days are %d weeks, %d days.\n",day,week,left); printf("Next input: ");scanf("%d",&day);}return 0;}4.#include<stdio.h>#define CM_PER_FEET 30.48 //1feet=30.48cm#define CM_PER_INCH 2.54 //1inch=2.54cmint main(void){int feet;float cm,inch;printf("Enter a height in centimeters: ");scanf("%f",&cm);while(cm>0){feet=(int)(cm/CM_PER_FEET);inch=(cm-feet*CM_PER_FEET)/CM_PER_INCH;printf("%.1f cm = %d feet, %.1f inches\n",cm,feet,inch); printf("Enter a height in centimeters (<=0 to quit): "); scanf("%f",&cm);}printf("bye\n");return 0;}5.#include<stdio.h>int main(void){int count,sum,days;printf("Input the number of days: ");scanf("%d",&days);count=sum=0;while(count++<days)sum=sum+count;printf("The money you earned: %d\n",sum);return 0;}6.#include<stdio.h>int main(void){int count,sum,days;printf("Input the number of days: ");scanf("%d",&days);count=sum=0;while(count++<days)sum=sum+count*count;printf("The money you earned: %d\n",sum);return 0;}7.#include<stdio.h>void cube(double n);int main(void){double num;printf("Input a number: ");scanf("%lf",&num);cube(num);}void cube(double n){printf("The cube of %f is %f\n",n,n*n*n);}8.#include<stdio.h>int main(void){int num1,num2;printf("This program computes moduli.\n");printf("Enter an integer to serve as the second operand: ");scanf("%d",&num1);printf("Now enter the first operand: ");scanf("%d",&num2);while(num2>0){printf("%d %% %d is %d\n",num2,num1,num2%num1);printf("Enter next number for first operand (<= 0 to quit): "); scanf("%d",&num2);}printf("Done\n");}9.#include<stdio.h>void Temperatures(double fah);int main(void){double fah,cel,kel;//华氏温度，摄氏温度，开氏温度printf("Input the Fahrenheit temperature: ");while(scanf("%lf",&fah)==1){Temperatures(fah);printf("Next input: ");}printf("Done.\n");}void Temperatures(double fah){const double a=5.0,b=9.0,c=32.0,d=276.13; printf("%.2f ℉ is %.2f ℃, %.2f K.\n",fah,a/b*(fah-c),a/b*(fah-c)+d);}第六章1.#include<stdio.h>#define SIZE 26int main(void){char ch[SIZE];int index;for(index=0;index<SIZE;index++){ch[index]='a'+index;printf("%c ",ch[index]);}printf("\n");return 0;}2.#include<stdio.h>int main(void){int i,j;for(i=1;i<=5;i++){for(j=1;j<=i;j++)printf("$");printf("\n");}return 0;}3.#include<stdio.h>int main(void){int i,j;for(i=1;i<=6;i++){for(j=0;j<i;j++)printf("%c",'F'-j); printf("\n");}return 0;}4.#include<stdio.h>#define ROWS 6int main(void){char ch;int i,j;for(ch='A',i=0;i<ROWS;i++) {for(j=0;j<=i;j++)printf("%c",ch++); printf("\n");}return 0;}5.#include<stdio.h>#define ROWS 5int main(void){char ch='A';int i,j;for(i=1;i<=ROWS;i++){for(j=1;j<=ROWS-i;j++)printf(" ");for(j=0;j<i;j++)printf("%c",ch+j);for(j=i-2;j>=0;j--)printf("%c",ch+j);printf("\n");}return 0;}6.#include<stdio.h>int main(void){int max,min,num;printf("Input the min and max: ");scanf("%d%d",&min,&max);printf("%10s%10s%10s\n","number","square","cube");for(num=min;num<=max;num++)printf("%10d%10d%10d\n",num,num*num,num*num*num); return 0;}7.//与题目不同打印的是句子#include<stdio.h>#include<string.h>#define SIZE 40int main(void){int i,index=-1;char ch[SIZE];printf("Input a word: ");do{ index++;scanf("%c",&ch[index]);}while(ch[index]!='\n');for(i=index+1;i<=40;i++)ch[i]='\0';for(index=strlen(ch);index>=0;index--)printf("%c",ch[index]);printf("\n");return 0;}8.#include<stdio.h>int main(void){double n1,n2;printf("Input two numbers: ");while(2==scanf("%lf%lf",&n1,&n2)){printf("%f\n",(n1-n2)/n1*n2);printf("Input your next pair of numbers: ");}printf("Bye!\n");return 0;}9.#include<stdio.h>double calculate(double n1, double n2);int main(void){double num1, num2;printf("Input two numbers: ");while (2 == scanf("%lf%lf", &num1, &num2)) //输入两个浮点数 {printf("%f\n", calculate(num1, num2)); //函数调用printf("Input your next pair of numbers: ");}printf("Bye!\n");return 0;}double calculate(double n1, double n2){return ((n1 - n2) / (n1 * n2)); //返回运算结果}10.#include <stdio.h>int main(void){int lower, upper;int num, sum;printf("Enter lower and upper integer limits: ");scanf("%d%d", &lower, &upper);while (lower < upper){for (sum=0, num=lower; num <= upper; num++)sum = sum + num * num; //计算平方和printf("The sums of the squares from %d to %d is %d\n", lower * lower, upper * upper, sum); //输出结果printf("Enter next set of limits: ");scanf("%d%d", &lower, &upper); //下一次输入}printf("Done\n");return 0;}11.#include <stdio.h>#define SIZE 8int main(void){int num[SIZE];int index;printf("Enter 8 integers: ");for (index=0; index<SIZE; index++) //输入8个整数scanf("%d", &num[index]);for (index=SIZE-1; index >= 0; index--) //倒序输出printf("%d ", num[index]);printf("\n");return 0;}12.#include <stdio.h>int main(void){double sum1=0, sum2=0;int count, items, sign;printf("Enter the items: ");scanf("%d", &items); //输入序列的项数for (count=1, sign=1; count <= items; count++, sign *= -1){sum1 += 1.0 / count;sum2 += 1.0 * sign / count;} //分别计算两序列的和 printf("1.0 + 1.0/2.0 + 1.0/3.0 + 1.0/4.0 + ... = %f\n", sum1); printf("1.0 - 1.0/2.0 + 1.0/3.0 - 1.0/4.0 + ... = %f\n", sum2);return 0;}13.#include <stdio.h>#define SIZE 8int main(void){int index, count, num[SIZE];for (index = 0, count = 1; index < SIZE; index++){count *= 2;num[index] = count;} //for循环将数组元素设为2的前8次幂 index=0; //初始化index的值doprintf("%d ", num[index++]);while (index < SIZE); //do while循环显示数组元素的值printf("\n");return 0;}14.#include <stdio.h>#define SIZE 8int main(){double num1[SIZE], num2[SIZE];int index1, index2, index;printf("Enter 8 numbers to the first array:\n");for (index1 = 0; index1 < SIZE; index1++)scanf("%lf", &num1[index1]); //向第一个数组输入8个数 num2[0] = num1[0];for (index1 = 1, index2 = 1; index1 < SIZE; index1++, index2++) num2[index2] = num2[index2-1] + num1[index1];//为第二个数组赋值（是第一个数组对应的元素之和）printf("The first array: ");for (index=0; index < SIZE; index++) {printf("%6.2f", num1[index]);} //输出第一个数组的内容 printf("\nThe second array: ");for (index=0; index < SIZE; index++) {printf("%6.2f", num2[index]); //输出第二个数组的内容 }printf("\n");return 0;}15.#include <stdio.h>#include <string.h>#define SIZE 255int main(void){int index;char ch[SIZE];printf("Enter a line: ");for(index = 0, scanf("%c", &ch[0]); ch[index] != '\n';){index++;scanf("%c", &ch[index]);} //输入内容到字符数组中,回车时结束for(index += 1; index < SIZE; index++)ch[index] = '\0'; //将数组剩余空间补充为'\0'for(index = strlen(ch); index >=0; index--)printf("%c", ch[index]); //倒序输出内容printf("\n");return 0;}16.#include <stdio.h>#define RATE_DAPHNE 0.1#define RATE_DEIRDRE 0.05 //两人的利率#define MONEY 100int main(void){int year;double daphne = MONEY, deirdre = MONEY; //两人的初始投资额相同for (year = 1; daphne >= deirdre; year++){daphne += MONEY * RATE_DAPHNE;deirdre += deirdre * RATE_DEIRDRE;}//计算Deirdre投资额超过Daphne需要的年数和当时的金额printf("After %d year, Deirdre's investment will be more than Daphne's,\n""Daphne's investment will be $%lf,\nand Deirdre's investment will be $%lf.\n",year, daphne, deirdre); //输出结果return 0;}17.#include <stdio.h>#define INITIAL_MONEY 100 //账户初始金额为100万元#define ANNUAL_RATE 0.08 //年利率为8%int main(void){int year;double money;for(year = 1, money=INITIAL_MONEY; money>0; year++)money += money * ANNUAL_RATE - 10; //计算每年年终的账户余额printf("After %d years, Chuckie will draw all money from his account.\n", year);return 0;}18.#include <stdio.h>#define INITIAL_NUMBER 5 //初始朋友数为5人#define DUNBAR_NUMBER 150 //邓巴数int main(void){int week;int number = INITIAL_NUMBER;for (week = 1; number <= DUNBAR_NUMBER; week++){number = (number - week) * 2; //计算每周的朋友数量printf("After %d week, the number of Rabnud's friends is %d\n", week, number);}return 0;}第七章1.#include <stdio.h>int main(void){char ch;int n_space = 0; //空格数int n_newline = 0; //换行数int n_others = 0; //其他字符数printf("Enter some text; Enter # to quit.\n"); while ((ch = getchar()) != '#'){if (ch == ' ')n_space++;else if (ch == '\n')n_newline++;elsen_others++;}printf("Spaces: %d, newlines: %d, others: %d\n", n_space, n_newline, n_others);return 0;}2.#include <stdio.h>#define CHARS_PER_LINE 8 //每行字符数int main(void){char ch;int n_chars = 1; //字符数printf("Enter some characters(# to quit):\n"); while ((ch = getchar()) != '#'){printf("%3c(%3d) ", ch, ch);if (n_chars++ % CHARS_PER_LINE == 0)printf("\n");}printf("\n");return 0;}3.#include <stdio.h>int main(void){int num;int n_even = 0, n_odd = 0; //偶数和奇数个数int sum_even = 0, sum_odd = 0; //偶数和奇数和printf("Enter some integers(0 to quit):\n");scanf("%d", &num);while (num != 0){if (num % 2 == 0){n_even++;sum_even += num;} //计算偶数个数和偶数和else{n_odd++;sum_odd +=num;} //计算奇数个数和奇数和scanf("%d",&num);}printf("The number of even numbers is %d, ""and the everage of even numbers is %.2f\n",n_even, (n_even == 0) ? 0 : (float)sum_even / n_even); printf("The number of odd numbers is %d, ""and the everrage of odd numers is %.2f\n",n_odd, (n_odd == 0) ? 0 : (float)sum_odd / n_odd);return 0;}4.#include <stdio.h>int main(void){char ch;int n_repl = 0; //替换次数printf("Enter some texts(# to quit):\n");while ((ch = getchar()) != '#') {if (ch == '.'){ch = '!';n_repl++;} //替换句号else if (ch == '!'){printf("!");n_repl++;} //替换感叹号printf("%c", ch);}printf("\n%d substitutions were made.\n", n_repl);return 0;}5.#include <stdio.h>int main(void){char ch;int n_repl = 0; //替换次数printf("Enter some texts(# to quit):\n");while ((ch = getchar()) != '#') {switch (ch){case '.': ch = '!';n_repl++;break;case '!': printf("!");n_repl++;break;default: break;} //利用switch语句进行替换 printf("%c",ch);}printf("\n%d substitutions were made.\n", n_repl);return 0;}6.#include <stdio.h>int main(void){char ch;char last_ch = 0; //前一个字符int count=0;printf("Enter some texts(# to quit):\n");while ((ch = getchar()) != '#'){if ((ch == 'i') && (last_ch == 'e'))count++;last_ch = ch; //出现ei时，计数+1}printf("\"ei\" appeared %d times.\n", count);return 0;}7.#include <stdio.h>#define BASE 1000 //基本工资 100美元/h#define TIME 40 //超过40h为加班#define MUL 1.5 //加班时间算作平时的1.5倍#define RATE1 0.15 //前300美元的税率#define RATE2 0.2 //300-450美元的税率#define RATE3 0.25 //大于450美元的税率#define BREAK1 300 //税率的第一个分界点#define BREAK2 450 //税率的第二个分界点int main(void){double hour, tax, gross;printf("Input your work hours in a week: ");scanf("%lf", &hour);if (hour <= TIME)gross = hour * BASE;elsegross = TIME * BASE + (hour - TIME) * MUL * BASE; //计算总收入if (gross <= BREAK1)tax = gross * RATE1;else if (gross <= BREAK2)tax = BREAK1 * RATE1 + (gross - BREAK1) * RATE2;elsetax = BREAK1 * RATE1 + (BREAK2 - BREAK1) * RATE2+ (gross - BREAK2) * RATE3;//计算税金printf("Your gross income is $%.2lf\nYour tax is $%.2lf\n""Your net income is $%.2lf\n",gross, tax, (gross - tax));return 0;8.#include <stdio.h>#define BASE1 8.75#define BASE2 9.33#define BASE3 10.00#define BASE4 11.20//四种等级的基本工资#define TIME 40 //超过40h为加班#define MUL 1.5 //加班时间算作平时的1.5倍#define RATE1 0.15 //前300美元的税率#define RATE2 0.2 //300-450美元的税率#define RATE3 0.25 //大于450美元的税率#define BREAK1 300 //税率的第一个分界点#define BREAK2 450 //税率的第二个分界点int main(void){double base, hour, tax, gross;int count, num;const int LENGTH = 65; //*的长度printpart: for (count = 0; count < LENGTH; count++)printf("*");printf("\nEnter the number corresponding to the desired pay rate or action:\n");printf("%-36s%s","1) $8.75/hr", "2) $9.33/hr\n");printf("%-36s%s","3) $10.00/hr", "4) $11.20/hr\n");printf("%s\n", "5) quit");for (count = 0; count < LENGTH; count++)printf("*");printf("\n");//打印表格while (scanf("%d", &num) == 1) {switch (num){case 1: base = BASE1;break;case 2: base = BASE2;break;case 3: base = BASE3;break;case 4: base = BASE4;break;case 5: printf("quit.\n");return 0;default: printf("Please input the right option.\n");goto printpart;} //选择基本工资等级printf("Input your work hours in a week: ");scanf("%lf", &hour);if (hour <= TIME)gross = hour * base;elsegross = TIME * base + (hour - TIME) * MUL * base;//计算总收入if (gross <= BREAK1)tax = gross * RATE1;else if (gross <= BREAK2)tax = BREAK1 * RATE1 + (gross - BREAK1) * RATE2;elsetax = BREAK1 * RATE1 + (BREAK2 - BREAK1) * RATE2+ (gross - BREAK2) * RATE3;//计算税金printf("Your gross income is $%.2lf\nYour tax is $%.2lf\n" "Your net income is $%.2lf\n",gross, tax, (gross - tax));printf("\nYour next choice:\n");}return 0;}9.#include <stdio.h>int main(void){int div, prime;int num, count;int flag;printf("Input a positive integer: ");scanf("%d", &num);printf("The prime numbers in range:\n");for (prime = 2; prime <= num; prime++) //外层循环显示所有素数 {flag = 1;for (div = 2; (div * div) <= prime; div++){if (prime % div == 0)flag = 0;} //内层循环检验是否为素数 if (flag) //利用标记flag判断printf("%d ",prime);}printf("\n");return 0;}10.#include <stdio.h>#define RATE1 0.15#define RATE2 0.28#define SINGLE 17850 //单身人群的税率分界点#define HOST 23900 //户主人群的税率分界点#define MAR_SHA 29750 //已婚共有人群的分界点#define MAR_DEV 14875 //已婚离异人群的分界点int main(void){int num;double income, tax_break, tax;printpart: printf("Please enter Corresponding""figures to select the type\n");printf("1 single, 2 host, 3 married and shared, ""4 married but devoced and 5 to quit.\n");scanf("%d", &num);switch (num){case 1: tax_break = SINGLE;break;case 2: tax_break = HOST;break;case 3: tax_break = MAR_SHA;break;case 4: tax_break = MAR_DEV;break;case 5: printf("quit.\n");return 0;default: printf("Please input right number.");goto printpart; //回到输入阶段}printf("Enter your income: "); //指定种类和收入while (scanf("%lf", &income) == 1){if (income <= tax_break)tax = income * RATE1;elsetax = tax_break * RATE1 + (income - tax_break) * RATE2; //计算税金printf("The tax is $%.2lf.\n", tax);printf("Your next input: \n");goto printpart; //回到输入阶段}return 0;}11.#include <stdio.h>#include <ctype.h>#define ARTICHOKE 2.05 //洋蓟2.05美元/磅#define BEET 1.15 //甜菜1.15美元/磅#define CARROT 1.09 //胡萝卜1.09美元/磅#define DISCOUNT_LIMIT 100//包装费和运费打折要求订单100美元#define DISCOUNT_RATE 0.05 //折扣为%5#define BREAK1 5#define BREAK2 20 //装运费的分界点#define FEE1 6.5#define FEE2 14#define FEE3_RATE 0.5//不同重量区间的装运费，其中超过20磅的每续重一磅//增加0.5元int main(void){double weight;double weight_artichoke = 0;double weight_beet = 0;double weight_carrot = 0; //购买三种蔬菜的重量double total_weight; //总重量double veg_cost; //三种蔬菜总共花费double order_cost; //订单总额double total_cost; //费用总额double pack_tran_fee; //装运费double discount;int count = 0;char ch;printf("Please select the vegetables you want to buy:\n");printf("a: artichoke $%.2f/lb\n", ARTICHOKE);printf("b: beet $%.2f/lb\n", BEET);printf("c: carrot $%.2f/lb\n", CARROT);printf("q: quit.\n");//打印选择信息while ((ch = tolower(getchar())) != 'q'){// if (ch == '\n')// continue; //滤掉回车switch (ch){case 'a': printf("Input the weight of artichoke in pound: "); scanf("%lf", &weight);weight_artichoke += weight;count++;printf("Continue entering a, b, c or q: ");break;case 'b': printf("Input the weight of beet in pound: ");scanf("%lf", &weight);weight_beet += weight;count++;printf("Continue entering a, b, c or q: ");break;case 'c': printf("Input the weight of carrot in pound: ");scanf("%lf", &weight);weight_carrot += weight;count++;printf("Continue entering a, b, c or q: ");break;default: printf("Please enter the right character.");}while (getchar () != '\n')continue; //滤掉输入重量后面的所有字符}if (!count){printf("Bye.\n");return 0;} //开始输出q，直接退出total_weight = weight_artichoke + weight_beet + weight_carrot;veg_cost = weight_artichoke * ARTICHOKE + weight_beet * BEET+ weight_carrot * CARROT;discount = 0;if (veg_cost >= DISCOUNT_LIMIT){discount = veg_cost * DISCOUNT_RATE;order_cost = veg_cost - discount;}elseorder_cost = veg_cost; //折扣计算if (total_weight <= BREAK1)pack_tran_fee = FEE1;else if (total_weight <= BREAK2)pack_tran_fee = FEE2;elsepack_tran_fee = FEE2 + (total_weight - BREAK2) * FEE3_RATE;//装运费计算total_cost = order_cost + pack_tran_fee;printf("\nHere is what you choose:\n");if (weight_artichoke) {printf("artichoke Price: $%.2f/lb weight: %.2f pounds cost: $%.2f\n",ARTICHOKE, weight_artichoke, weight_artichoke * ARTICHOKE); }if (weight_beet) {printf("beet Price: $%.2f/lb weight: %.2f pounds cost: $%.2f\n",。

第一章概览编程练习1．您刚刚被MacroMuscle 有限公司( Software for Hard Bodies )聘用。

该公司要进入欧洲市场，需要一个将英寸转换为厘米(1 英寸= cm)的程序。

他们希望建立的该程序可提示用户输入英寸值。

您的工作是定义程序目标并设计该程序(编程过程的第 1 步和第2步)。

1. 将英寸值转化为厘米值2. 显示“输入英寸值” ->得到该值-> 转换为厘米值->存储-> 告知用户已结束第二章 C 语言概述编程练习1 ．编写一个程序，调用printf() 函数在一行上输出您的名和姓，再调用一次printf() 函数在两个单独的行上输出您的名和姓，然后调用一对printf() 函数在一行上输出您的名和姓。

输出应如下所示(当然里面要换成您的姓名) ：Anton BrucknerAntonBrucknerAnton Bruckner第一个输出语句第二个输出语句仍然是第二个输出语句第三个和第四个输出语句#include<>int main(void){printf("He Jin\n");printf("He\n");printf("Jin\n");printf("He Jin\n");return(0);}2 ．编写一个程序输出您的姓名及地址#include<>int main(void){ printf("Name:He Jin\n");printf("Address:CAUC\n");return(0);}3 ．编写一个程序，把您的年龄转换成天数并显示二者的值。

不用考虑平年( fractional year) 和闰年(leapyear) 的问题。

#include<>int main(void){int age=22; printf("Age:%d\n",age);printf("Day:%d\n",age*356);return(0);}4 ．编写一个能够产生下面输出的程序：For he's a jolly good fellow!For he's a jolly good fellow!For he's a jolly good fellow!Which nobody can deny!程序中除了main() 函数之外，要使用两个用户定义的函数：一个用于把上面的夸奖消息输出一次：另一个用于把最后一行输出一次。

C++PrimerPlus中文第六版第五章编程练习//刚接触C++,学习过程中自己编写的课后练习。

只用了一个main函数,用注释把各个题目分开了// practice.cpp : 定义控制台应用程序的入口点。

//#include"stdafx.h"#include<iostream>#include<string>//#include <cstring>int main(){using namespace std;//1/*int min_int,max_int;long count = 0;cout << "请输入第一个较小的整数：";cin >> min_int;cout << "请输入第二个较大的整数：";cin >> max_int;for (;min_int <= max_int;min_int++){count += min_int;}cout << "整数和：" << count << endl;cout << "Press any key to return.";cin.get();cin.get();return 0;*///3/*int shu,he = 0;cout << "输入一个数(输入则结束): ";cin >> shu;while ( shu!=0 ){he += shu;cout << "目前为止输入累计和= " << he << endl;cout << "请输入下一个数(输入则结束): ";cin >> shu;}cout << "Press any key to return.";cin.get();cin.get();return 0;*///4/*const double yuanshizijin = 100;const double danli = 0.1;const double fuli = 0.05;double Daphne,Cleo;Daphne = yuanshizijin;Cleo = yuanshizijin;cout << "Daphne的原始存款为：" << Daphne << endl;cout << "Cleo的原始存款为：" << Cleo << endl;int i;for (i = 1;(Cleo < Daphne) || (i == 1);i++){Daphne = yuanshizijin + yuanshizijin * danli * i;Cleo = Cleo + Cleo * fuli;cout << i << "年后，Daphne的存款总额为：" << Daphne << ", Cleo 的存款总额为：" << Cleo << endl;}cout << "第" << i << "年，Cleo的存款总额超过Daphne的存款总额\n";cout << "此时，Daphne的存款总额为：" << Daphne << ", Cleo的存款总额为：" << Cleo << endl;cout << "Press any key to return.";//cin.get();cin.get();return 0;*///5/*string * pt[12];string months[12] = {"请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: ","请输入月份的图书销售量: "};int shuliang[13];int i;for(i = 0;i < 12;i++){pt[i] = &months[i];cout << *pt[i];cin >> shuliang[i];}for (i = 0,shuliang[12] = 0;i < 12;i++){shuliang[12] += shuliang[i];}cout << "全年图书总销量：" << shuliang[12] << endl;cout << "Press any key to return.";cin.get();cin.get();return 0;*///6/*int three_years[3][13] = {};int i,j;for (i = 0;i < 3;i++){cout << "输入第" << i+1 << "年个月的图书销量：\n";for (j = 0;j < 12;j++){cout << "输入" << j+1 << "月的图书销量：";cin >> three_years[i][j];three_years[i][12] += three_years[i][j];}}for (i = 0;i < 3;i++){cout << "第" << i+1 << "年个月的图书总销量为：" <<three_years[i][12] << endl;}cout << "三年图书总销量为：" << three_years[0][12] +three_years[1][12] + three_years[2][12] << endl;cout << "Press any key to return.";cin.get();cin.get();return 0;*///7/*struct car{string shengchanshang;int year;};int qicheshu;cout << "输入汽车数：";cin >> qicheshu;cin.get();//避免getline()读入空行car * pt = new car[qicheshu];int i;for (i = 0;i < qicheshu;i++){cout << "输入第" << i +1 << "辆汽车生产商：";getline(cin,(pt + i) -> shengchanshang);cout << "输入第" << i +1 << "辆汽车生产年份：";cin >> (pt + i) -> year;cin.get();//避免getline()读入空行}cout << "这是你输入的汽车信息：\n";for (i = 0;i < qicheshu;i++){cout << (pt + i) -> year << " " << (pt + i) -> shengchanshang << endl;}delete [] pt;//切记释放内存cout << "Press any key to return.";cin.get();return 0;*///8/*char word[30];int count = 0;cout << "Enter words (to stop, type the word done)\n";cin >> word;while (strcmp(word,"done") != 0){count++;cin >> word;}cout << "You entered a total of " << count << " words" << endl;cout << "Press any key to return.";cin.get();cin.get();return 0;*///9/*string str;int count = 0;cout << "Enter words (to stop, type the word done)\n";cin >> str;while (str != "done"){count++;cin >> str;}cout << "You entered a total of " << count << " words" << endl;cout << "Press any key to return.";cin.get();cin.get();return 0;*///10int star;cout << "Enter number of rows: ";cin >> star;int i,j;for (i = 1; i <= star;i++){for (j = 0;j < star - i;j++){cout << ".";}for (;j < star;j++){cout << "*";}cout << endl;}cout << "Press any key to return.";cin.get();cin.get();return 0;}。