大学C语言课后答案7

第0章习题1. 将下列十进制数分别转化为二进制数、八进制数和十六进制数：（1）128 （2）511 （3）1024 （4）65535 （5）1048575答：（1）10000000、200、80（2）111111111、777、1FF（3）10000000000、2000、400（4）1111111111111111、177777、FFFF（5）11111111111111111111、3777777、FFFFF2. 将下列二进制数转化为十进制数和十六进制数：（1）1100110101B （2）101101.1011B答：（1）821、335（2）45.6875、2D.B3. 写出下列数的原码、反码、补码：15、-20、-27/32答：（1）00001111、00000000、00001111（2）10010100、11101011、11101100（3）1.1101100、1.0010011、1.00101004. 16位无符号定点整数的数值表示范围为多少？8位补码的表示范围是多少？16位补码的表示范围是多少？答：0～65535、-128～127、-32768～327675．1968年Dijkstra提出结构化程序设计的思想的原因是什么？简要回答结构化程序设计的经典定义。

答：结构化程序设计概念的提出主要是源于程序结构的层次性与模块化使得构造出来的软件具有良好的可理解性和可维护性，随着软件规模的扩大与复杂性的提高，程序的可维护性成为程序设计者们关注的重要问题之一。

如果一个程序的代码块仅仅通过顺序、选择和循环这3种基本控制结构进行连接，并且每个代码块只有一个入口和一个出口，则称这个程序是结构化的。

6．C程序在内存中存储在哪儿？计算机的内存空间是如何分区的？分区存放不同类型的数据的目的是什么？答：C语言程序属于应用程序，程序代码本身存放在应用程序区，程序运行时处理的数据存放在应用程序数据区。

计算机的内存空间主要分为3个区：系统程序区、应用程序区和数据区，其中数据区又分为系统程序数据区和应用程序数据区两类。

第一篇：《C语言程序设计教程》(第三版)课后习题参考答案C语言程序设计课后习题参考答案习题一一、单项选择题1、C2、B3、B4、C5、D6、A7、C8、A二、填空题1、判断条件2、面向过程编程3、结构化4、程序5、面向对象方法6、基本功能操作、控制结构7、有穷性8、直到型循环结构9、算法10、可读性11、模块化12、对问题的分解和模块的划分习题二一、单项选择题1、B2、D3、C4、B5、A二、填空题1、主2、C编译系统3、结构化4、程序5、面向对象方法6、.OBJ7、库函数8、直到型循环结构习题三一、单项选择题1、D2、B3、A4、C9、B10、C11、A12、D13、C17、B18、C19、C20、D21、A25、D26、A二、填空题1、补码2、10^-138~10^1 38、15~166、A7、B6、D7、B14、B15、C22、D8、C8、D16、A24、D、A3、实4、单目运算符、自右向左5、函数调用6、65,89习题四一、单项选择题1、D2、C3、D4、A5、D6、B7、A8、C9、B10、B二、填空题1、两, ；2、5.1690003、-200 2500、i=-200，j=2500回车、i=-200回车j=2500回车4、a=98，b=765.000000，c=4321.0000005、100 25.81 1.89234、100,25.81,1.89234、100回车25.81回车1.89234回车6、0，0，37、38、scanf(“%lf %lf %lf”,&a,&b,&c);9、13 13.000000 13.00000010、c=b-a;a=b+c;习题五一、单项选择题1、B2、D3、C4、B5、B6、D7、A8、B二、填空题1、1 、02、k！=03、if（x>4||xelse printf(“error!”); 4、if(((x>=1&&x=200&&x Printf(“%d”,x);5、16、17、10! Right!8、a=09、2,110、0习题六一、单项选择题9、D1、B2、C3、C4、B5、C6、B7、C8、A二、填空题1、无穷次2、83、205、3.66、*#*#*#$7、828、d=1.0 、k++、k9、！（x习题七一、单项选择题1、B2、D3、C4、C5、A二、填空题1、1 2 4 8 16 32 64 128 256 5122、a[age]++、i=18;i3、break、i==84、a[i]>b[i]、i3、j5、b[j]=0、b[j]=a[j][k]习题八一、单项选择题1、B3、C4、A5、A9、D10、B11、A12、C13、A二、填空题1、return1、return n+sum(n-1)2、return1、n*facto(n-1)习题九一、单项选择题1、D2、C3、D4、A5、C9、B10、C11、A13、B17、C18、A19、B20、C二、填空题1、int 、return z2、*p++3、’\0’、++4、p、max*q6、A7、D6、A7、C14、C15、B6、C7、C14、A15、D8、A8、D8、C习题十一、单项选择题1、D2、D3、A4、5、B6、A7、C8、B9、D10、11、C12、D13、D14、C二、填空题1、34 122、ARRAY a[10],b[10],c[10];3、2 34、ab、cd5、（*b）.day、b->day6、adghi mnohi no7、（struct node *）、！=’\n’、p=top;8、p1=p1->next9、（struct list *）、(struct list *)、return (n)习题十一一、单项选择题1、A2、A3、B4、A5、B9、A10、B11、B12、B13、C17、D二、填空题1、ASCII(文本)、二进制2、pf=fopen(“A:\zk04\data xfile.dat”,”w”);3、fputc()、fputs()、fscanf()、fread()4、（后两个空）文件结束符、非0值7、B14、C15、D8、A16、A第二篇：C语言程序设计教程课后习题参考答案《C语言程序设计教程》课后习题参考答案习题1 1. （1）编译、链接.exe （2）函数主函数（或main函数）（3）编辑编译链接2.（1）-（5）：DDBBC （6）-（10）：ABBBC 3.（1）答：C语言简洁、紧凑，使用方便、灵活；C语言是高级语言，同时具备了低级语言的特征；C 语言是结构化程序设计语言，具有结构化的程序控制语句；C语言有各种各样的数据类型；C语言可移植性好；生成目标代码质量高，程序执行效率高。

第一章C语言初步一、选择题1.C2.D3.D4.A5.D6.B7.B 8.B 9.C 10.A二、思考与应用题1．A．字符串常量B．字符串常量C．整型常量D．浮点型常量（double）2．A．long doubleB．long intC．floatD．字符型常量3．A．整型常量B．字符型常量C．字符串常量D．字符串常量4．FirstExample: 10,w is Yz is 5.125．int main(void){return 0;}6．#include<stdio.h>int main(void){print f("Hello World");return 0;}7．#include<stdio.h>int main(void){printf("We are to learn correct");printf("C language here");return 0;}/*main*/8．#include<stdio.h>int main(void){/*Local Definition*/int a;float b;char c;/*Statements*/printf("The end of the program."); return 0;}/*main*/9．#include<stdio.h>int main(void){/*Local Definition*/int a;float b;char c,d;/*Statements*/printf("The end of the program."); return 0;}/*main*/10．#include<stdio.h>int main(void){/*Local Definition*/int a;char b,c,d;float e,f;/*Statements*/printf("The end of the program."); return 0;}/*main*/11．A．char option;B．int sum=0;C．float produce=1;12．A．short code;B．float salesTax=.0825;C．double sum=0;13．#include<stdio.h>int main(void){float cost=172.53;printf("The sales total is: $ %6.2f\n",cost);printf("^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^");return 0;}14．#include<stdio.h>int main(void){printf("******\n");printf("******\n");printf("******\n");printf("******\n");return 0;}15．#include<stdio.h>int main(void){printf("*\n");printf("**\n");printf("***\n");printf("****\n");return 0;}16．#include<stdio.h>int main(void){int x1=1;int x2=10;int x3=100;int x4=1000;int x5=10000;printf("%d %d %d %d %d\n",x1,x2,x 3,x4,x5);printf("%f %f %f %f %f\n",x1,x2,x 3,x4,x5);return 0;}17．#include<stdio.h>int main(void){int x;printf("Please enter an integer:\n");scanf("%d",&x);printf("The number as a character:%c\n",x);printf("The number as a decimal:%d\n",x);printf("The number as a float:%f\n",x);return 0;}三、编程题1．#include<stdio.h>int main(void){int x1;int x2;int x3;printf("Please enter three numbers:");scanf("%d%d%d",&x1, &x2, &x3);printf("\nYour numbers forword:\n");printf("%8d\n%8d\n%8d\n",x1,x2,x3 );printf("Your numbers reversed:\n");printf("%8d\n%8d\n%8d\n",x3,x2,x1 );return 0;}2．#include<stdio.h>int main(void){int x1;int x2;int x3;int x4;int x5;int x6;int x7;int x8;int x9;int x10;printf("Please enter 10 numbers:\n");scanf("%d%d%d%d%d%d%d%d%d%d",&x1, &x2, &x3, &x4, &x5, &x6, &x7, &x8, &x9, &x10);printf("\nYour numbers are:\n");printf("%8d%8d\n",x1,x10);printf("%8d%8d\n",x2,x9);printf("%8d%8d\n",x3,x8);printf("%8d%8d\n",x4,x7);printf("%8d%8d\n",x5,x6);return 0;}3．#include<stdio.h>int main(void){int x1;int x2;int x3;int x4;int x5;int x6;int x7;int x8;int x9;printf("Input:\n");printf(" ");scanf("%d%d%d%d%d%d%d%d%d",&x1, &x2, &x3, &x4, &x5, &x6, &x7, &x8, &x9);printf("\nOutput\n");printf("%8d,%d,%d\n",x1,x2,x3);printf("%8d,%d,%d\n",x4,x5,x6);printf("%8d,%d,%d\n",x7,x8,x9);return 0;}第二章表达式与简单程序设计一、选择题1.A2.D3.C4.B5.B6.D7.B二、思考与应用题1．A．2 B．8 C．8 D．0 E．11 2．A．4，4B．4，4 C．4，4 D．2，3 E．4，53．A．12 B．-27 C．14 D．2 E．4 4．A．22.52 B．4.5 C．13.333333 D．0.882353 E．0.075．ABCEF6．A．5 B．2 C．4 D．1 E．7．A．5 B．2 C．4 D．-3 E．6 8．A．5 B．294 C．4 D．29 E．9 9． 50 50 100 2510．#include<stdio.h>int main(void){float x;float y;float p;float s;float total;printf("Please enter x and y:\n");scanf("%f%f",&x,&y);p=x*y;s=x+y;total=s*s+p*(s-x)*(p+y);printf("total=%f",total);return 0;}11．#include<stdio.h>int main(void){int x,y,z;printf("Please enter two integers:\n");scanf("%d%d",&x,&y);z=x*y;printf("%d*%d=%d",x,y,z);return 0;}12．#include<stdio.h>int main(void){float x;int y;printf("Please enter a floating point number:\n");scanf("%f",&x);y=(int)x%10;printf("%d",y);return 0;}13．#include<stdio.h>int main(void){float x;int y;printf("Please enter a floating point number:\n");scanf("%f",&x);y=(int)x/10%10;printf("%d",y);return 0;}14．#include<stdio.h>int main(void){float x;float y;float c;float s;p rintf("Please enter length and width:\n");s canf("%f%f",&x,&y);c=2*(x+y);s=x*y;p rintf("The circumference is %f\n",c);p rintf("The measure of area is %f",s);r eturn 0;}15．#include<stdio.h>int main(void){int a;f loat r;p rintf("Please enter an angle(integer):\n");s canf("%d",&a);r=a/57.295779;p rintf("%d°is %.5f radians",a,r);r eturn 0;}16．#include<stdio.h>int main(void){float c;float F;printf("Please enter centigrade:\n");scanf("%f",&c);F=32+(c*180.0/100.0);printf("Fahrenheit is %f ",F);return 0;}17．（1）double m,v,KinEn;KinEn=m*v*v/2;（2）double b,c,res;res=(b+c)/（2*b*c）;18．（1）#include<stdio.h>int main(void){int x=25;x=x+5;printf("%d\n",x);x=x+5;printf("%d\n",x);return 0;}（2）#include<stdio.h>int main(void){int x=10;x=x+2;printf("%d\n",x);x=x+2;printf("%d\n",x);return 0;}（3）#include<stdio.h>int main(void){int x=32;x=x*2;printf("%d\n",x);x=x*2;printf("%d\n",x);return 0;}三、编程题1．A．#include<stdio.h>int main(void){float x;float y;printf("Please enter an number(inch):\n");scanf("%f",&x);y=x/12;printf("%f inches is %f feet ",x,y);return 0;}B．#include<stdio.h>int main(void){float x;float y;printf("Please enter an number(inch):\n");scanf("%f",&x);y=x/36;printf("%f inches is %f yards ",x,y);return 0;}C．#include<stdio.h>int main(void){float x;float y;printf("Please enter an number(inch):\n");scanf("%f",&x);y=x*2.54;printf("%f inches is %f centimeters ",x,y);return 0;D．#include<stdio.h>int main(void){float x;float y;printf("Please enter an number(inch):\n");scanf("%f",&x);y=x/39.37;printf("%f inches is %f meters ",x,y);return 0;}2．#include<stdio.h>int main(void){int fib1;int fib2;int fib3;fib1=13+21;fib2=21+fib1;fib3=fib1+fib2;printf("%d,%d,%d",fib1,fib2,fib3);return 0;}3．#include<stdio.h>int main(void){int x;int b1;int b2;int b3;int b4;int b5;printf("Please enter an integer(0-32767):\n");scanf("%d",&x);b1=x%10;b2=x/10%10;b3=x/100%10;b4=x/1000%10;b5=x/10000%10;printf("%4d%4d%4d%4d%4d\n",b5,b4,b3,b2,b1);printf("%4d%4d%4d%4d%\n",b4,b3,b2,b1);printf("%4d%4d%4d\n",b3,b2,b1);printf("%4d%4d\n",b2,b1);printf("%4d",b1);return 0;}第三章分支程序设计一、选择题1.C2.D3.A4.B5.B6.A7.C8.C 9.A二、思考与应用题1．A．0 B．1 C．1 D．0 E．0 2．A．x>=y B．x<y C．x!=y D．x==y E．x>y3．A．0 B．1 C．1 D．1 E．0 4．x=4,y=3,z=25．x=4,y=1,z=26．x=4,y=2,z=27．x=4,y=1,z=28．x=0,y=0,z=19．x=2,y=0,z=210．x=0,y=0,z=111．x=0,y=0,z=112．x=-1,y=0,z=013．x=0,y=1,z=014．x=1,y=3,z=115．x=1,y=3,z=116．x=4,y=3,z=017．if(aChar=='E'){c++;printf("Value is E\n");}18．switch(ch){case ‘E’:case ‘e’:countE++;break;case ‘A’:case ‘a’:countA++;break;case ‘I’:case ‘i’:countI++;break;default:printf("Error-Not A,E,or I\a\n"); }三、编程题1．#include<stdio.h>main( ){int x,x1,x2,x3;char grade;printf("please enter three text scores(0-100):\n");scanf("%d%d%d",&x1,&x2,&x3);x=(x1+x2+x3)/3;if(x>=90)grade='A';else if(x>=70&&x<90)if(x3>90)grade='A';elsegrade='B';else if(x>=50&&x<70)if((x2+x3)/2>70)grade='C';elsegrade='D';else if(x<50)grade='F';printf("%c\n",grade);}2．#include<stdio.h>main( ){int year;printf("please enter a year:\n");scanf("%d",&year);if(year%4==0&&year%100!=0||year%400==0)printf("%d is a leap year!\n",year);elseprintf("%d is a non-leap year!\n",year);}3．#include<stdio.h>main( ){i ntyearNow,monthNow,dayNow,year,month,day,x;printf("Please enter the date today(month day year):\n");scanf("%d%d%d",&monthNow,&dayNow,&yearNow);printf("Please enter your birthday(month day year):\n");s canf("%d%d%d",&month,&day,&year);if(monthNow<month)x=yearNow-year-1;else if(monthNow==month)if(dayNow<day)x=yearNow-year-1;elsex=yearNow-year;elsex=yearNow-year;printf("You are %d years old!\n",x);}4．#include<stdio.h>#include<stdlib.h>#include<time.h>main( ){int number,Ynumber;srand(time(NULL));number=rand()%20+1;printf("I am thinking of a number between 1 and 20.\n");printf("Can you guess what it is?");scanf("%d",&Ynumber);if(Ynumber==number)printf("Congratulations!You did it.");else{if(Ynumber>number)printf("Your guess is high.Try again:");elseprintf("Your guess is low.Try again:");scanf("%d",&Ynumber);if(Ynumber==number)printf("Congratulations!You did it.");else{if(Ynumber>number)printf("Your guess is high.Try again:");elseprintf("Your guess is low.Try again:");scanf("%d",&Ynumber);if(Ynumber==number)printf("Congratulations!You did it.");else{if(Ynumber>number)printf("Your guess is high.Try again:");elseprintf("Your guess is low.Try again:");scanf("%d",&Ynumber);if(Ynumber==number)printf("Congratulations!You did it.");else{if(Ynumber>number)printf("Your guess is high.Try again:");elseprintf("Your guess is low.Try again:");scanf("%d",&Ynumber);if(Ynumber==number)printf("Congratulations!You did it.");else{printf("sorry.The number was %d.\n",number);printf("You should have gotten it by now.\n");printf("Better luck next time.");}}}}}}5．#include<stdio.h>main( ){int year,month,day,x=0,y,z;printf("Please enter your birthday:(year month day)\n");scanf("%d%d%d",&year,&month,&day);y=((year-1)*365+((year-1)/4)-((year-1)/100) +((year-1)/400))%7;switch(month){case 12:x=x+30;case 11:x=x+31;case 10:x=x+30;case 9:x=x+31;case 8:x=x+31;case 7:x=x+30;case 6:x=x+31;case 5:x=x+30;case 4:x=x+31;case 3:x=x+28;case 2:x=x+31;case 1:x=x+0;}if(year%4==0&&year%100!=0||year%400==0)day++;z=(x+day+y)%7;switch(z){case 0:printf("The day of your birthday is Sunday!");break;case 1:printf("The day of your birthday is Monday!");break;case 2:printf("The day of your birthday is Tuseday!");break;case 3:printf("The day of your birthday is Wednesday!");break;case 4:printf("The day of your birthday is Thursday!");break;case 5:printf("The day of your birthday is Friday!");break;case 6:printf("The day of your birthday is Saturday!");break;}}6．#include<stdio.h>#include<math.h>main( ){int a,b,c,p;float x1,x2;printf("Please enter a,b,c:\n");scanf("%d%d%d",&a,&b,&c);p=b*b-4*a*c;if(a==0)if(b==0)printf("There is no solution!");else{x1=-(float)c/b;printf("The solution is x1=%f",x1);}elseif(p<0)printf("There is no real solution!");else{x1=-b+sqrt(p)/(2*a);x2=-b-sqrt(p)/(2*a);printf("The solutions are x1=%f,x2=%f",x1,x2);}}。

选择题1．已知：int *p, a;，则语句“p=&a;”中的运算符“&”的含义是( D )。

A．位与运算B．逻辑与运算C．取指针内容D．取变量地址2．已知：int a, x;，则正确的赋值语句是( C )。

A．a=(a[1]+a[2])/2; B．a*=*a+1; C．a=(x=1, x++, x+2); D．a="good"; 3．已知：int a, *p=&a;，则下列函数调用中错误的是( D )。

A．scanf("%d", &a); B．scanf("%d", p); C．printf("%d", a); D．scanf("%d", *p); 4．已知：char *p, *q;，选择正确的语句( C )。

A．p*=3; B．p/=q; C．p+=3; D．p+=q;5．已知：int x;，则下面的说明指针变量pb的语句( C )是正确的。

A．int pb=&x; B．int *pb=x; C．int *pb=&x; D．*pb=*x;一、选择题1．设有说明int (*ptr)[M];，其中的标识符ptr是( C )。

A．M个指向整型变量的指针B．指向M个整型变量的函数指针C．一个指向具有M列的二维数组的一行的指针D．具有M个指针元素的一维数组的指针2．已知：double *p[6];，它的含义是( C )。

A．p是指向double型变量的指针B．p是double型数组C．p是指针数组D．p是数组指针3．已知：char s[10], *p=s，则在下列语句中，错误的语句是( B )。

A．p=s+5; B．s=p+s; C．s[2]=p[4]; D．*p=s[0];4．已知：char s[100]; int i;，则在下列引用数组元素的语句中，错误的表示形式是( D )。

C语言课后习题参考答案第一章：基础知识问题1：C语言的发展历史及特点C语言是由贝尔实验室的肯·汤普逊和丹尼斯·里奇在20世纪70年代初开发的一种高级程序设计语言。

它以其简洁、高效和可移植性而闻名。

C语言被广泛应用于系统级编程、嵌入式系统和科学计算等领域，并成为其他编程语言的基础。

问题2：C语言的基本数据类型及其存储范围C语言的基本数据类型包括字符型（char）、整型（int）、浮点型（float）、双精度浮点型（double）和空类型（void）。

它们的存储范围如下：- char：-128 到 127 或 0 到 255- int：-32,768 到 32,767 或 0 到 65,535- float：3.4E-38 到 3.4E38- double：1.7E-308 到 1.7E308- void：无特定存储范围问题3：如何在C语言中输出语句？在C语言中，可以使用printf函数来输出语句。

它的基本语法为：```cprintf("要输出的内容");```问题4：定义变量的语法规则在C语言中，定义变量的语法规则如下：```c数据类型变量名;```例如，定义一个整型变量x：```cint x;```问题5：如何进行变量的赋值？变量的赋值可以使用赋值运算符（=）。

例如，将一个整型常量10赋值给变量x：```cx = 10;```第二章：控制结构问题1：if语句的语法结构if语句用于根据条件执行不同的代码块。

它的基本语法结构如下：```cif (条件) {// 条件为真时执行的代码}```问题2：switch语句的用法及语法结构switch语句用于根据不同的表达式值执行相应的代码块。

它的基本用法及语法结构如下：```cswitch (表达式) {case 值1:// 当表达式的值等于值1时执行的代码break;case 值2:// 当表达式的值等于值2时执行的代码break;default:// 当表达式的值与所有case都不匹配时执行的代码break;}```问题3：循环语句的分类及语法结构C语言中的循环语句包括for循环、while循环和do-while循环。

#include<stdio.h>main(){int a[10],n,sum=0,i;float ave;printf("enter n:\n");scanf("%d",&n);printf("enter %d ge zheng shu:\n",n);for(i=0;i<n;i++){scanf("%d",&a[i]);sum=sum+a[i];}ave=1.0*sum/n;printf("ave=%.2f\n",ave);}/*练习7-2*/#include<stdio.h>main(){int a[10],n,i;printf("enter n:\n");scanf("%d",&n);printf("enter %d ge zheng shu:\n",n);for(i=0;i<n;i++){printf("第%d个:\n",i+1);scanf("%d",&a[i]);printf("倒序:\n");while(a[i]!=0){printf("%d",a[i]%10);a[i]=a[i]/10;}printf("\n");}}#include<stdio.h>main(){int a[5],x,i,k=0;printf("enter 5 ge zheng shu:\n");for(i=0;i<5;i++)scanf("%d",&a[i]);printf("enter x:\n");scanf("%d",&x);for(i=0;i<5;i++)if(a[i]==x){printf("xia biao wei : %d\n",i);k=1;}if(k==0)printf("Not Found\n");}/*练习7-4*/#include<stdio.h>main(){int a[10],n,i,k=0,x,max;printf("enter n:\n");scanf("%d",&n);printf("enter %d ge zheng shu:\n",n);for(i=0;i<n;i++)scanf("%d",&a[i]);max=a[0];for(i=1;i<=n-1;i++)if(max<a[i]){max=a[i];k=i;}printf("max=%d xia biao=%d",max,k);x=a[n-1];a[n-1]=a[k];a[k]=x;printf("\n");for(i=0;i<n;i++)printf(" %d ",a[i]);printf("\n");}/*练习7-11*/#include<stdio.h>main(){char str[80];int i,j,count=0;printf("输入一个以回车符结束的字符串:\n");i=0;while((str[i]=getchar())!='\n')i++;str[i]='\0';printf("再输入一个字符:\n");str[80]=getchar();for(j=0;j<=i-1;j++)if(str[80]==str[j])count++;printf("%c字符在字符串中出现的次数为:%d\n",str[80],count);for(j=0;j<=i-1;j++)putchar(str[j]);printf("\n");}/*习题七1*/#include<stdio.h>main(){int x,y,n,a[10],i,min,max;printf("输入n:\n");scanf("%d",&n);printf("输入%d个整数:\n",n);for(i=0;i<n;i++)scanf("%d",&a[i]);min=0;for(i=1;i<n;i++)if(a[min]>a[i])min=i;max=0;for(i=1;i<n;i++)if(a[max]<a[i])max=i;x=a[min];a[min]=a[0];a[0]=x;y=a[max];a[max]=a[n-1];a[n-1]=y;for(i=0;i<n;i++)printf("%4d",a[i]);printf("\n");}/*习题七2*/#include<stdio.h>main(){int x,n,a[10],i,j,max;printf("输入n:\n");scanf("%d",&n);printf("输入%d个整数:\n",n);for(i=0;i<n;i++)scanf("%d",&a[i]);for(i=1;i<n;i++){ max=i-1;for(j=i;j<n;j++)if(a[max]<a[j])max=j;x=a[max];a[max]=a[i-1];a[i-1]=x;}for(i=0;i<n;i++)printf("%4d",a[i]);printf("\n");}/*习题七4*/#include<stdio.h>main(){int m,n,a[6][6],i,j,b[6]={0};printf("输入m:\n");scanf("%d",&m);printf("输入n:\n");scanf("%d",&n);printf("输入%d和%d的矩阵:\n",m,n);for(i=0;i<m;i++){for(j=0;j<n;j++){scanf("%d",&a[i][j]);b[i]=b[i]+a[i][j];}}printf("shu chu:\n");for(i=0;i<m;i++){for(j=0;j<n;j++)printf(" %d",a[i][j]);printf("\n");}printf("shu chu hang he :\n");for(i=0;i<m;i++)printf("%4d",b[i]);printf("\n");}/*习题7.6*/#include<stdio.h>main(){char str[80];int i,j;printf("输入一个以回车符结束的字符串:\n");i=0;while((str[i]=getchar())!='\n')i++;printf("倒序输出:\n");for(j=i-1;j>=0;j--)putchar(str[j]);printf("\n");}/*新7.6*/#include<stdio.h>main(){int a[10],i,n;printf("输入整数n:\n");scanf("%d",&n);printf("输入%d个整数:\n",n);for(i=0;i<n;i++){scanf("%d",&a[i]);}printf("倒序输出:\n");for(i=0;i<n;i++){printf("%5d",a[n-1-i]);}printf("\n");}/*习题7.7*/#include<stdio.h>main(){char str[80];int i,j,count=0;printf("输入一个以回车符结束的字符串:\n");i=0;while((str[i]=getchar())!='\n')i++;printf("输出其中的大写辅音字母:\n");for(j=0;j<=i-1;j++)if(str[j]>='B'&&str[j]<='Z'&&str[j]!='E'&&str[j]!='I'&&str[j]!='O'&&str[j]!='U'){putchar(str[j]);count++;}printf("\n");printf("大写辅音字母数量为:%d\n",count);}/*习题7.8*/#include<stdio.h>main(){char str[80];int i,j,count=0;printf("输入一个以回车符结束的字符串:\n");i=0;while((str[i]=getchar())!='\n')i++;printf("输出相应交换后的字符串:\n");for(j=0;j<=i-1;j++)if(str[j]>='A'&&str[j]<='Z')str[j]=155-str[j];for(j=0;j<=i-1;j++)putchar(str[j]);printf("\n");}上文已完。

《C语言程序设计》课后习题参考答案(总23页)--本页仅作为文档封面，使用时请直接删除即可----内页可以根据需求调整合适字体及大小--高等院校计算机基础教育规划教材《C++程序设计》课后习题参考答案――武汉大学出版社习题1参考答案一、选择题1. A2. D二、填空题1. BASIC、FORTRAN、AL_GOL60和COBOL2. 83. 关键字4. 编辑、编译、链接和运行三、简答题1.答：（1）C语言具有结构化的控制语句。

C语言提供了结构化程序所必需的基本控制语句，实现了对逻辑流的有效控制。

（2）C语言具有丰富的数据结构类型。

C语言除提供整型、实型、字符型等基本数据类型外，还提供了用基本数据类型构造出的各种复杂的数据结构，如数组、结构、联合等。

C语言还提供了与地址密切相关的指针类型。

此外，用户还可以根据需要自定义数据类型。

（3）C语言具有丰富的运算符。

C语言提供了多达34种运算符，丰富的数据类型与丰富的运算符相结合，使C语言的表达力更具灵活性，同时也提高了执行效率。

（4）C语言简洁、紧凑，使用方便、灵活，程序书写自由，有9种控制语句。

（5）C语言既具有高级语言的功能，又具有低级语言的许多功能，通常被称为中级计算机语言。

它既是成功的系统描述语言，又是通用的程序设计语言。

（6）C语言与汇编语言相比，可移植性好。

（7）功能强大。

C语言具有低级语言的一些功能，所以，生成目标代码质量高，程序执行效率高。

现在许多系统软件都用C语言来描述，可以大大提高了编程效率。

2.答：运行一个C语言程序，一般需要经过如下几个步骤：①上机输入并编辑源程序；②编译源程序；③与库函数连接；④生成可执行目标程序；⑤运行目标程序。

3.答：（1）操作系统的设计与实现。

C语言是一种应用非常广泛的结构化高级程序设计语言，既适合编写应用软件，又适合编写系统软件。

（2）工业控制。

由于C语言具有简洁、灵活、代码效率高、能进行位操作等优点，C语言大量应用在单板机、单片机上，以及嵌入式领域等。

5-1#include"stdio.h" void main(){char c1,c2;printf("c1:");c1=getchar();if(c1>='a'&&c1<='z') c2=c1-32;else if(c1>='A'&&c1<='Z') c2=c1+32;else c2=c1;printf("=>%c\n",c2);}5-2#include"stdio.h"void main(){char c;printf("c:");c=getchar();if(c>='A'&&c<='Z')if(c=='A') printf("没有前面的字母！");else if(c=='Z') printf("没有后面的字母!!");else printf("前面的字母=%c,后面的字母=%c",c-1,c+1);printf("\n");} 5-3#include"stdio.h"void main(){int s;char g;printf("s:");scanf("%d",&s);if(s>=0&&s<=100){switch(s/10){case 9:case 10: g='A';break;case 8: g='B';break;case 7: g='C';break;case 6: g='D';break;default: g='E';}printf("g=%c\n",g);}else printf("成绩不在百分制范围内！\n"); }5-4#include"stdio.h"void main(){int y,m,d,dok;int yy,mm,dd;printf("y,m,d:");scanf("%d,%d,%d",&y,&m,&d);switch(m){case 1: case 3: case 5: case 7: case 8: case 10: case 12:if(d>0&&d<=31) dok=4;else dok=0;break;case 4: case 6: case 9: case 11:if(d>0&&d<=30) dok=3;else dok=0;break;case 2: if(y%4==0&&y%100!=0||y%400==0)if(d>0&&d<=29)dok=2;else dok=0;elseif(d>0&&d<=28)dok=1;else dok=0;break;default: dok=0;}if(dok==0) printf("月份或日期不对！\n");else{switch(dok){case 1: if(d==28){yy=y;dd=1;mm=m+1;}else{yy=y;dd=d+1;mm=m;}break;case2:if(d==29){yy=y;dd=1;mm=m+1;}else{yy=y;dd=d+1;mm=m;}break;case3:if(d==30){yy=y;dd=1;mm=m+1;}else{yy=y;dd=d+1;mm=m;}break;case 4:if(d==31)if(m==12){yy=y+1;dd=1;mm=1;}else{yy=y;dd=1;mm=m+1;}else{yy=y;dd=d+1;mm=m;}break;}printf("Tomorrow:%d年%d月%d日\n",yy,mm,dd);}}5-5#include"stdio.h"void main(){int a,b,c,t;printf("a,b,c:");scanf("%d,%d,%d",&a,&b,&c);if(a+b>c&&b+c>a&&a+c>b){if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}if(a==b&&b==c) printf("等边三角形.");else if(a==b||b==c||a==c) printf("等腰角形.");else if(c*c==a*a+b*b) printf("直角三角形.");else printf("任意三角形.");printf("\n");}else printf("不能构成三角形！\n");}6-1#include"stdio.h"void main(){int a,b,m,n,k;printf("m,n:");scanf("%d,%d",&m,&n);a=m;b=n;k=a%b;while(k){a=b;b=k;k=a%b;}printf("%d\n",(m*n/b));}6-2#include"stdio.h"void main(){int n;int i,j,s;printf("n=");scanf("%d",&n);for(i=1;i<=n;i++){s=0;for(j=1;j<i;j++)if(i%j==0) s=s+j;if(s==i) {printf("%d:",i);for(j=1;j<i;j++)if(i%j==0) printf("%d ",j);printf("\n");}}} 6-3#include"stdio.h"#include"math.h"void main(){double x,y,zd,zx,x1,x2;zd=zx=50;for(x=0;x<=2;x=x+0.2){y=2*pow(x,3)-3*pow(x,4)+6*pow(x,5)-4*x+50;if(y>zd){ zd=y;x1=x;}if(y<zx){ zx=y;x2=x;}}printf("x=%f,max=%f\n",x1,zd);printf("x=%f,min=%f\n",x2,zx);}6-4#include"stdio.h"void main(){double x,sum=0,a,b,c;int i;printf("x=");scanf("%lf",&x);a=x;b=1.0;c=1.0;for(i=1;i<=10;i++){sum=sum+a/(b*c);a=a*x*x;b=b+2;c=c*i;}printf("y(%.2lf)=%lf\n",x,sum);}7-1/*选择排序*/#include"stdio.h"void main(){int i,j,n,k,temp;int a[10];printf("n(<10):");scanf("%d",&n);printf("Original:");for(i=0;i<n;i++) scanf("%d",&a[i]);for(i=0;i<n-1;i++){ /*趟*/k=i;for(j=i+1;j<n;j++) /*比较次数*/if(a[j]<a[k]) k=j;/*<升序，>?*/if(k!=i){temp=a[i];a[i]=a[k];a[k]=temp;}}printf("Ordered:");for(i=0;i<n;i++) printf("%d ",a[i]);printf("\n");}7-2#include"stdio.h"void main(){int a[3][3];int i,j,s=1;printf("Input:\n");for(i=0;i<3;i++)for(j=0;j<3;j++){scanf("%d",&a[i][j]);if(i==j) s=s*a[i][j];}printf("s=%d\n",s);} 7-3/*杨辉三角*/#include"stdio.h"void main(){int x[7][7];int i,j;for(i=0;i<7;i++) {x[i][0]=1;x[i][i]=1;}for(i=2;i<7;i++)for(j=1;j<i;j++)x[i][j]=x[i-1][j]+x[i-1][j-1];for(i=0;i<7;i++){for(j=0;j<=i;j++)printf("%3d",x[i][j]);printf("\n");}}7-4#include<stdio.h>#include<string.h>void main(){char str[21];int i,j;printf("str:");gets(str);for(i=0,j=strlen(str)-1;i<=j;i++,j--)if(str[i]!=str[j]) break;if(i>j) printf("%s是回文\n",str);else printf("%s不是回文\n",str);}7-5/*输入一维数组的10个元素，并将最小值与第1个数交换，最大值与最后一个数交换，然后输出交换后的结果*/#include<stdio.h>void main(){int a[10],i,zx,zd;printf("Input:\n");zx=zd=0;for(i=0;i<10;i++){scanf("%d",&a[i]);if(a[i]<a[zx]) zx=i;if(a[i]>a[zd]) zd=i;}if(zx!=0){int t;t=a[0];a[0]=a[zx];a[zx]=t;}if(zd!=9){int t;t=a[9];a[9]=a[zd];a[zd]=t;}for(i=0;i<10;i++)printf("%d ",a[i]);printf("\n");} 8-2#include"stdio.h"double xexp(double x,int n){double c;if(n==0) c=1.0;else c=x*xexp(x,n-1);return c;}void main(){int n;double x;printf("x:");scanf("%lf",&x);printf("n:");scanf("%d",&n);printf("Result=%g\n",xexp(x,n));}8-3#include"stdio.h"int find(int x[],int n,int y){int i,pos=-1;for(i=0;i<n;i++)if(x[i]==y) pos=i;return pos;}void main(){int a[10]={11,1,13,15,18,7,19,27,3,8};int i,y,pos;for(i=0;i<10;i++) printf("%d ",a[i]);printf("\ny:");scanf("%d",&y);pos=find(a,10,y);if(pos==-1) printf("Not found!\n");else printf("Position=%d\n",pos);}8-1#include"stdio.h"#include"conio.h" //getch()#include"stdlib.h" //srand(),rand(),system("cls") #include"time.h" //time()void main(){void init(int a[][5],int m,int n);void input(int a[][5],int m,int n);void output(int a[][5],int m,int n);int min(int b[][5],int m,int n);int a[5][5],ch='0';while(1){system("cls"); //清屏printf("1.初始化 2.键盘输入0.结束程序:");printf("\n");if(ch=='0') break;else if(ch=='1'){init(a,5,5);output(a,5,5);}else if(ch=='2'){input(a,5,5);output(a,5,5);}else printf("Error!\n");printf("Min element:%d\n",min(a,5,5));printf("按任意键继续！\n");getch();}}void init(int a[][5],int m,int n){int i,j;srand(time(0)); //time(0)表示以当前的时间做种子,增加每次运行的随机性for(i=0;i<5;i++)for(j=0;j<5;j++)a[i][j]=rand()%100; //随机数范围:0~32767,将它控制在0~99的范围}void input(int a[][5],int m,int n){int i,j;printf("Input Array 5X5:\n");for(i=0;i<m;i++)for(j=0;j<n;j++)scanf("%d",&a[i][j]);}void output(int a[][5],int m,int n){int i,j;printf("Output Array 5X5:\n");for(i=0;i<5;i++){for(j=0;j<5;j++)printf("%2d ",a[i][j]);printf("\n");}}int min(int b[][5],int m,int n){int i,j,zx;zx=b[0][0];for(i=0;i<m;i++)for(j=0;j<n;j++)if(i==j&&b[i][j]<zx) zx=b[i][j];return zx;}8-4#include"stdio.h"float pave,nave;void saver(float a[],int n){int i,z,f;float psum,nsum;psum=nsum=0.0;z=f=0;for(i=0;i<n;i++)if(a[i]<0) {nsum=nsum+a[i];z++;}else if(a[i]>0) {psum=psum+a[i];f++;}else continue;pave=(z!=0?psum/z:0.0);nave=(f!=0?nsum/f:0.0);}void main(){float a[10]={1.0,11.0,3.0,-1.5,-5.5,-2};saver(a,10);printf("pave=%.1f,nave=%.2f\n",pave,nave); } 8-5#include"stdio.h"#include"math.h"void p1(int a,int b){printf("has two equal roots:%\n",-b/(2*a));}void p2(int a,int b, int disc){float x1,x2;x1=(-b+sqrt(disc))/(2*a);x2=(-b-sqrt(disc))/(2*a);printf("Has distant real roots:% and %\n",x1,x2);}void p3(int a,int b, int disc){float real,image;real=-b/(2*a);image=sqrt(-disc)/(2*a);printf("Has complex roots:\n");printf("%+%8.4fi\n",real,image);printf("%-%8.4fi\n",real,image);}void main(){ int a,b,c,disc;printf("a,b,c:");scanf("%d,%d,%d",&a,&b,&c);disc=b*b-4*a*c;if(fabs(disc)<=1e-6) p1(a,b);else if(disc>1e-6) p2(a,b,disc);else p3(a,b,disc);}8-6#include"stdio.h"#include"stdlib.h"#include"conio.h"#include"time.h"void main(){void printaverage(int score[][5],int m,int n);void printname(int score[][5],int m,int n);int score[10][5];int i,j;srand(time(0));for(i=0;i<10;i++)for(j=0;j<5;j++)score[i][j]=50+rand()%50+1;printf("Output Students' score:\n");printf("Course 1 2 3 4 5\n");printf("-------------------------\n");for(i=0;i<10;i++){printf("No.%2d:",i+1);for(j=0;j<5;j++)printf("%3d ",score[i][j]);printf("\n");}printaverage(score,10,5);printname(score,10,5);} void printaverage(int score[][5],int m,int n){int i,j,sum;printf("\nAverage score:\n");for(i=0;i<m;i++){sum=0;for(j=0;j<n;j++)sum=sum+score[i][j];printf("No.%d:%.1f\n",i+1,sum/5.0);}}void printname(int score[][5],int m,int n){int i,j,max0,row0;for(j=0;j<5;j++){max0=score[0][j];for(i=0;i<10;i++)if(score[i][j]>max0){max0=score[i][j];row0=i;}printf("Course %d,max score=%d,student:No.%d\n",j+1,max0,row0+1);}}大学英语I词汇练习题Choose the best one to complete each sentence.1. She felt like ____C___ frustration, but she was determined not to lose her self-control.A. to cry out ofB. to cry forC. crying out ofD. crying for2. The method he used turned out to be ___A____ in improving the students' English.A. effectiveB. abilityC. responseD. explicit3. Measures had to be taken in face of the housing problem that ____C____ in the city.A. foundedB. raisedC. aroseD. produced4. Without electronic computers, much of today's advanced technology ___D____.A. haven't been achievedB. wouldn't be achievedC. hadn't been achievedD. wouldn't have been achieved5. Jane said to her husband, "Don't worry. There is no cause for __B______ about our daughter'sability to manage herself."A. careB. concernC. attentionD. love6. The tap won't ____A____, and there is water all over the floor.A. turn offB. turn downC. turn onD. turn up7. Wearing the right shoes and clothes ____B____ being fit can make all the difference.A. in additionB. as well asC. alsoD. too8. She didn't try to do anything for her daughter, and ____B____ it's too late now.A. in caseB. in any caseC. at this caseD. in case of9. The girl said she hated _____C___ he smiled at her.A. that wayB. this wayC. the wayD. all the way10. I'll call the hotel. I'll tell them we'll ____A____ tomorrow morning and stay there for two nights.A. check inB. check outC. check offD. check over11. My father didn't go to New York; the doctor suggested that he ___C____ there.A. not to goB. won'tC. not goD. not to go to12. She _____C____ him to find answers to her problems.A. learned fromB. came intoC. leaned onD. subjected to13. The large wings of that bird ______B_____ it to fly high and fast.A. makeB. enableC. forceD. realize14. If he ____D___ the policeman honestly, he would not have been arrested.A. would answerB. answerC. should answerD. had answered15. I intended ___A____ you last Sunday, but I had no time.A. to have called onB. calling onC. to be calling onD. to be called on16. If you try to learn too many things at a time, you may get ____D___.A. alarmedB. scaredC. surprisedD. confused17. I haven't read this book, and my brother hasn't ____A____.A. eitherB. neitherC. alsoD. too18. No sooner ____B_____ than the truck started off.A. his luggage was loadedB. had his luggage been loadedC. loaded his luggageD. his luggage was being loaded19. At the end of the game, the whole crowd ____C____ their feet and cheered wildly.A. emerged fromB. rose fromC. got toD. stood up20. Darren has decided to give ___D_____ football at the end of this season.A. inB. forC. offD. up21. Neither his friends nor his mother ____B____ his marriage to that girl.A. acceptB. acceptsC. agreeD. agrees22. Most people believe that he is quite _____A___ of lying to get out of trouble.A. capableB. enabledC. ableD. skilled23. We were told that most of our luggage would be _____B___ by sea.A. approachedB. transportedC. handledD. communicated24. The Broadcasting Museum also offers Saturday workshops to _____B___ children with the world of radio.A. contriveB. acquaintC. acquireD. admit25. Without a passport, leaving the country is ____D___.A. out of questionB. without questionC. in the questionD. out of the question26. She states her views very ___A______.A. definitelyB. definiteC. infiniteD. infinitely27. You need to ____D____ the employers that you can do the job.A. convictB. confuseC. confirmD. convince28.The little boy was so lucky to have ___B_____ the earthquake.A. surviveB. survived C .surviving D. survival29. It is ___B___ that later in life you will see each other again.A. likeB. likelyC. likedD. seemed30.Women’s social ____B____ has changed much over the years.A. stateB. statusC. statesD. statement31.The novel _____D____ the imagination of thousands of readers.A. caterB. cateredC. captureD. captured32.There are good chances of ______D______ working in this firm.A. prospectB. portionC. positionD. promotion33.If you are ______A_____ a night owl, having the first class start in the afternoon might be thebest thing that could ever happen to you.A. more ofB. more thanC. much moreD. more34. The conference discussed the fair ______A_____of income and wealth.A. distributionB. distributeC. contributionD. contribute35. I was so ___C__ in today's history lesson that I didn't understand anything.A. amazedB. confusingC. confusedD. amazing36. ___B___ in England, Anne Bradstreet both admired and imitated several English poets.A. Having born and educatedB. Born and educatedC. Since born and educatedD. To be born and educated37. You will see this product ___B___ wherever you go.A. to be advertisedB. advertisedC. advertiseD. advertising38. I never forget my __B__ with you for the first time.A. to meetB. meetingC. to have metD. having to be meeting39.She was so angry that she left like __B__ something at him.A. to throwB. throwingC. to have thrownD. having thrown40. We are ___C__ in different kinds of extracurricular activities on campus.A. having involvedB. to involveC. involvedD. involving41.Let me assure you that it was not done ______D_____.A. intensiveB. intensivelyC. intentionalD. intentionally42.This medicine can ____A____ the pain in no time.A. lessenB. lessC. looseD. loosen43.Advertising is often the most ____A____ method of product promotion.A. effectiveB. effectedC. emotionalD. efficient44.It is at 5 a.m. _C___ the train from Beijing to Guangzhou will arrive.A. forB. withC. thatD. when45.Things might have been much worse if the mother _B___ on her right to keep the baby.A. has been insistingB. had insistedC. would insistD. insisted46.Had he worked harder, he __B__ the exams.A. must have got throughB. would have got throughC. permitted are freshmenD. are permitted freshmen47.God knows, how can I ____A____ six exams a week?.A. endureB. tolerateC. bear D .suffer48.All their attempts ______C______ the child from the burning building were in vain.A. rescuedB. to have rescueC. to rescueD. in rescuing49，Could you find someone ______C_______ for me to play tennis with?A. to fitB. fitC. fittingD. suit50. The smooth space flight marks a big ______D______ for Chinese scientists.A. breakB. breakingC. breakupD. breakthrough51 Economic crises destroy the capitalist system, and they grow in size and ____A____.A. durationB. duringC. endureD. enduringpanies will have to do more than this if they are to ___B_____ the earthquake.A. survivedB. surviveC. survivesD. surviving53. The baby felt ____C____ by her parents.A. hateB. loveC. ignoredD. ignore54. There are good chances of ______D______ in this firm.A. moveB. motiveC. motionD. promotion55. She tried to ______D______ our friendship.A. underminedB. keptC. maintainedD. undermine56. The new airport will ______C___ tourism.A. helpedB. useC. facilitateD. benefited57. They were full of ____B____ when they saw my new car.A. jealousB. envyC. pitifulD. loves58. This medicine can ____A____ the pain in no time.A. lessenB. lessC. leastD. little59.He _______A_____ her on her last physics paper.A. complimentedB. complimentC. completeD. completed60. Mrs. Hill is _______B____ on Tom’s marrying Susan.A. awareB. keenC. kindD. keep61. Let me assure you that it was not done ______C_____.A. internationalB. purposeC. intentionallyD. intentional62.The novel _____D_____ the imagination of thousands of readers.A. seizeB. catchC. captureD. captured63. If you yell ___A____ someone, you should apologize.A. atB. outC. ofD. under64. He came over and ____B____ a piece of paper into my hand.A. shoveB. shovedC. shovesD. shoving65. The girl student whose father is a senior engineer used to ___A____ abroad.A. studyB. studyingC. studiesD. studied66.The doctor tried to help ____D____ the function of his limbs.A. storeB. storesC. restoresD. restore67. Women’s social ____B____ has changed much over the years.A. placeB. statusC. landD. work68. It was he ___A___ knew he didn’t need to be afraid to make mistakes at that moment.A. whoB. whomC. whichD. whose69. A dropped cigarette is being ____C____ for the fire.A. firedB. fireC. blamedD. blame70. Advertising is often the most _____D___ method of promotion.A. effectB. affectC. affectedD. effective71.In time you’ll _____A_____ the beauty of this language.A. appreciateB. appreciatesC. appreciatedD. appreciating72. ______B___ is his favorite toy is hard for the kid to decide.A. whoB. whichC. howD. where73. After dinner, I took a ____A____ around the park.A. strollB. divingC. runD. walking74. The boy really enjoyed the useful and ____B____ work in science.A. creationB. creativeC. createdD. creator75. Some professions are _____A_______ with people who have not grown up.A. stuffedB. stuffC. stiffD. stiffed76. Economic crises destroy the capitalist system, and they grow in size and ____A____.A. durationB. duringC. endureD. enduring77. The new airport will ____C_____ tourism.A. helpedB. useC. facilitateD. benifited78. Let me assure you that it was not done _____C______.A. internationalB. purposeC. intentionallyD. intentional79. The girl student whose father is a senior engineer used to ___A____ abroad.A. studyB. studyingC. studiesD. studied80. Advertising is often the most ____D____ method of promotion.A. effectB. affectC. affectedD. effective81. It was he ___A___ knew he didn’t need to be afraid to make mistakes at that moment.A. whoB. whomC. whichD. whosepanies will have to do more than this if they are to _____B___ the earthquake.A. survivedB. surviveC. survivesD. surviving83. The baby felt ____C____ by her parents.A. hateB. loveC. ignoredD. ignore84. If you yell ___A____ someone, you should apologize.A. atB. outC. ofD. under85. Mrs. Hill is ______B_____ on Tom’s marrying Susan.A. awareB. keenC. kindD. keep86. _____A____ college takes hard work!A. SurvivingB. SurviveC. SurvivesD. To surviving87. It is absolutely ____A___ for the human beings to do something to save the earth.A. necessaryB. necessarilyC. unnecessaryD. unnecessarily88. An employer is more ____D____ to choose the candidate with high grades.A. likeB. probablyC. possiblyD. likely89. I don’t like this young woman. She seems a social ___D____.A. flowerB. workerC. negotiatorD. butterfly90. How should this ___B____ girl see the coldness of the letter?A. blindB. innocentC. warmD. pretty91. Be careful not to ___B____ yourself in their local conflicts.A. attendB. involveC. take part inD. participate92. Home prices are holding ____C___ in most regions, and people live with steady income.A. flexibleB. fierceC. stableD. shortage93. He was ______C______ by a newspaper reporter at that time.A. being interviewB. interviewC. being interviewedD. to interview94. They were full of ____C____ when they saw my new car.A. enviousB. envilyC. envyD. envies95. ________C_________, it is a very stable pattern producing results through effort .A. ContraryB. ConverseC. On the contraryD. Diverse96. The teacher doesn’t permit _____B____ in classA. smokeB. smokingC. to smokeD. to have a smoke97. The man in the corner confessed to ___A____ a lie to the manager of the company.A. have toldB. be toldC. being toldD. having told98. I never forget __B____ you for the first time.A. to meetB. meetingC. to have metD. having to be meeting.99. _______A___ a man has, ___________ he wants.A. The more, the moreB. More, moreC. The more, moreD. More, the more100. I see no _____B____ of his success.A. possibleB. possibilityC. possibilitiesD. probable101. He could be ____B____ about everything else in the world, but not about Manet, his loving child.A. visualB. criticalC. favoriteD. essential102. Some see themselves as the provider of ideas, ____C____ others view their role as essentially managerial.A. whenB. thereforeC. whileD. otherwise103. The idea ____A____ to him so much that he took it without hesitation.A. appealedB. interestedC. drewD. attracted104. The teacher evaluated the performance of each of his students who ____B____ evaluated his performance.A. by turnB. in turnC. at turnD. on turn105. Disease _____A____ during the journey and many passengers had to be rushed to hospital for treatment.A. broke outB. broke downC. started offD. started out106. The products have been _____A_____ to strict tests before leaving the factory.A. subjectedB. adjustedC. objectedD. constricted107. Our television set is out of order. Could you come and _____C_____ it for us?A. see throughB. see outC. see toD. see over108. _____C_____ they have taken matters into their hands, the pace of events has quickened.A. As thatB. So thatC. Now thatD. For that109. Our neighbor said if we made more noise he would _____B____ us to the police.A. inform ofB. complain aboutC. report toD. care for110. People working in the government should not _____A______ business affairs that might affect their political decisions.A. engage inB. hope forC. choose betweenD. pick on111. It's not easy to ______B______ to the top in show business.A. make outB. make itC. make upD. make them112. Carter is in charge of the office while I'm ______C______.A. leavingB. on leavingC. on leaveD. on relief113. We must ____B____ our attention on the question of reducing our cost.A. payB. focusC. absorbD. promote 114. Snap judgments, if ___B_____, have usually been considered signs of immaturity or lack of common sense.A. taking seriouslyB. taken seriouslyC. take seriouslyD. to be taken seriously115. Being with his family for a few days, I gained one or two insights ____A____ the reason he behaves the way he does.A. intoB. ofC. onD. off116. ___D___ your age or knowledge of the language, you'll be 100% involved in your studies from the first lesson to the last.A. As a result ofB. In spiteC. Despite ofD. Regardless of117. He said he had caught a bad cold and told me to ____D____ him.A. stay atB. stay upC. stay inD. stay away from118. Good managing of a company ___A_____ great efforts.A. calls forB. calls outC. calls inD. calls at119. I've looked ___C_____ all my papers but I still can't find the contract.A. uponB. outC. throughD. in120. When I'm going out in the evening I use the bike if I can, ___B_____ the car.A. regardless ofB. more thanC. other thanD. rather than121. We can't speak ___A____ our teacher.A. too highly ofB. too high ofC. highly of tooD. to highly of122. No one in our class ____D___ in sports than he.A. are more interestedB. are much interestedC. is much interestedD. is more interested123. As a teacher you have to ____B____ your methods to suit the needs of slower children.A. enlargeB. adjustC. affectD. afford124. ________A___ the hotel before soldiers armed with pistols and clubs charged into the crowd.A. Scarcely had they leftB. Scarcely they had leftC. Scarcely they leftD. Scarcely left they125. In the film, the peaceful life of a monk _____D_____ the violent life of a murderer.A. is compared withB. is compared toC. is contrasted toD. is contrasted with126 I didn't realize the food problem was so _____B___ in this city; with winter coming, many people would starve to death without more help.A. essentialB. criticalC. explicitD. effective127. Female socialization places importance on getting along with others, _____B___ male socialization places importance on becoming independent.。

C语言程序设计第四版第七章答案-谭浩强第七章函数7.1写两个函数，分别求两个整数的最大公约数和最小公倍数，用主函数调用这两个函数，并输出结果两个整数由键盘输入。

maxyueshu(m,n)int m,n;{ int i=1,t;for(;i<=m&&i<=n;i++){if(m%i==0&&n%i==0)t=i;}return(t);}minbeishu(m,n)int m,n;{int j;if(m>=n) j=m;else j=n;for(;!(j%m==0&&j%n==0);j++);return j;}main()整数，输出是否是素数的消息。

psushu(m)int m;{int i=2,t;for(;i<=m;i++)if(m%i==0&&i<m) break;if(m-i==0) t=1;else t=0;return m;}main(){int a,s;printf("enter sushu is \n");scanf("%d",&a);s=psushu(a);if(s==1) printf("a is sushu\n");else printf("s is not sushu\n");}7.4写一个函数，使给定的一个二维数组（３×３）转置，即行列互换。

int zhuangzhi(b)int b[3][3];{int i,j,t;for(i=0;i<3;i++)for(j=0;j>=i&&j<3-i;j++){t=b[i][j];b[i][j]=b[j][i];b[j][i]=t;}}main(){int a[3][3];int i,j;for(i=0;i<3;i++)for(j=0;j<3;j++)scanf("%d",&a[i][j]);for(i=0;i<3;i++){for(j=0;j<3;j++)printf(" %d",a[i][j]);printf("\n");}zhuangzhi(a);for(i=0;i<3;i++){for(j=0;j<3;j++)printf(" %d",a[i][j]);printf("\n");}}7.5写一函数，使输入的一个字符串按反序存放，在主函数中输入输出字符串。