(完整word版)一些简单的C语言程序代码

C语言程序大全一、概述C语言是一种十分常用的编程语言，广泛应用于多个领域，包括操作系统、嵌入式系统、游戏开发等。

本文将为您提供一份C语言程序大全，涵盖了常见的C语言程序示例，帮助您更好地理解和运用C语言。

二、基本语法1. Hello, World! 程序示例```c#include <stdio.h>int main() {printf("Hello, World!\n");return 0;}```以上代码是C语言的经典入门示例，它会在控制台输出"Hello, World!"。

通过此示例，您可以了解到C语言的基本语法，如#include 指令、main函数等。

2. 变量和数据类型示例```c#include <stdio.h>int main() {int num1 = 10;float num2 = 3.14;char ch = 'A';printf("num1 = %d\n", num1);printf("num2 = %f\n", num2);printf("ch = %c\n", ch);return 0;}```以上代码展示了如何声明和初始化变量，并输出它们的值。

通过此示例，您可以学习到C语言的基本数据类型，如整型、浮点型、字符型等。

3. 条件语句示例```c#include <stdio.h>int main() {int num = 10;if (num > 0) {printf("num is positive.\n");} else if (num < 0) {printf("num is negative.\n");} else {printf("num is zero.\n");}return 0;}```以上代码展示了如何使用条件语句来进行判断。

C语言简单程序代码以下代码亲自运行成功，可黏贴到vc中运行gets和puts函数 #include\void main() { char str[20]; gets(str);//输入字符串 puts(str);//输出字符串 }整型、字符、字符串、一维数组的初始化、输入和输出 #include\#include\voidmain() { int i = 2; printf(\请输入一个int型\ int ii; scanf(\ printf(\//字符类型 char c = 'x'; printf(\请输入一个char型\ char cc; scanf(\ //cc = getchar(); printf(\ //putchar(cc); //字符串型 char str[] = \ printf(\请输入一个字符串类型\ char strr[100];//必须指定大小 //scanf(\字符数组名就代表了地址gets(strr);//字符串输入函数 //printf(\ puts(strr); //一维数组int a[5] = {1,2,3,4,5}; for(int j = 0;j < 5;j ++)printf(\ int b[3]; printf(\请输入三个数字\\n\ for(int k = 0;k < 3;k ++) { scanf(\ } printf(\输入三个数字是：\\n\ for(k = 0;k < 3;k ++) printf(\}//结构体 struct student { char name[9]; int score[3];//存放3门课成绩 }; student stu[2];//定义两个学生的数组 for(int i = 0;i < 2;i ++){ printf(\请输入第%d个学生的信息：\\n\ printf(\姓名：\ scanf(\ for(int j= 0;j < 3;j ++) { printf(\成绩%d:\ scanf(\ } }字符串输出void main() { char str[]= \ int i; char c; for(i = 0;i <strlen(str);i++) { printf(\输出abcd } for(i = 0;(c = str[i]) != '\\0';i++) { printf(\输出4个# } }单个输出整数的每个数字 #include\void main() { int a = 12342139; int i;do { i = a ; printf(\ a = a / 10; }while(a); }整型，字符串，数组的指针及输出 #include\#include\#include\ int *p; voidmain() {/* char *str = \最初指向V str++; printf(\输出后面的字符串zz int a[3]= {1,2,3}; p=a;//最初指向1 p++;//移动一个，指向2 printf(\*/ char * month[3] = {\ month[0]++; printf(\输出Wie：anuary }各数值类型所占字节数 #include\void main() { printf(\ printf(\ printf(\ printf(\ printf(\ printf(\}字符串和指针 #include\#include\#include\void main() { char *str = \最初指向V str++;//后来指向x str++;//变成指向z printf(\输出单个字符z printf(\输出后面的字符串zz }递增操作符#include\void main() { int a = 2; int b = 0; int c = 0; b = a++;//2，先赋值后加1 c = ++a;//4，先加1后赋值printf(\}函数判断最大值int max(int a,int b,int c) { int temp; temp = a > b ? a : b; temp = temp > c ? temp : c; return temp; }输入字符，如果是大写变成小写 #include\void main() { char ch; printf(\请输入一个字母\\n\ scanf(\ch = (ch >= 'A' && ch <= 'Z')?(ch + 32):ch;//小写比大写大32 printf(\ }输入一行字符，判断其中的英文字母，空格，数字和其他字符的个数 char ch; while((ch = getchar()) != '\\n') { if((ch >= 'A' && ch <= 'Z')||(ch >= 'a' && ch <= 'z') letters ++; else if(ch == ' ') space ++; else if(ch >= '0' && ch <= '9') digit ++; else others ++; }猜数字#include\#include\void main() { int count = 0;//猜数次数感谢您的阅读，祝您生活愉快。

//1.成绩判断#include <stdio.h>int main(){//成绩int score;printf("请输入你的成绩:\n");scanf("%d", &score);//判断if(score >=0 && score < 60){printf("不及格\n");}else if(60 <= score && score < 80){printf("中等\n");}else if(80 <= score && score < 100){printf("优秀\n");}else{printf("输入错误!\n");}}//2.计算1到100的和#include <stdio.h>int main(){int sum = 0;//存结果变量int i;for(i=1;i <= 100;i++){sum = sum + i;}printf("sum=%d\n", sum);}//3.最大公约数#include <stdio.h>//求m,n的最大公约数int main(){int m, n;int i, k;printf("请输入两个数:");scanf("%d %d", &m, &n);//三元运算符找较小的那个k = m < n ? m : n;//从较小的那个数倒着往前找for(i=k; i>=1; i--){//这是公约数if((m % i == 0) && (n % i ==0)){printf("最大公约数是%d\n", i);break;//跳出for循环}}}//4.最小公倍数#include <stdio.h>//求m,n的最小公倍数int main(){int m, n;int max, min;//m,n中较大,较小的那个int k;//max, 2*max, 3*max, .....printf("请输入两个数:");scanf("%d %d", &m, &n);//也可以交换m,n,保证m小n大max = m > n ? m : n;min = m < n ? m : n;k = max;//从max开始while(k % min != 0){k += max;//每次倍增}printf("最小公倍数是%d\n", k); }//5.金字塔#include <stdio.h>//金字塔int main(){int i;//外层int j;//内层for(i=1;i<=10;i++){//当前是在第i行//先补空格10-i个for(j=1;j<=10-i;j++){printf(" ");}//再打2i-1个*for(j=1;j<=2*i-1;j++){printf("*");}printf("\n");}}//6.九九乘法表#include <stdio.h>//打印九九乘法表int main(){int i,j;for(i=1;i<=9;i++)//外层一定是9行{for(j=1; j<=i; j++)//内层第几行走几遍{printf("%d*%d=%d ", i, j, i*j);}printf("\n");}}//7.百钱买百鸡#include <stdio.h>/**百钱买百鸡,类似1,2,5凑100银币问题*/int main2(){int i,j;//公鸡，母鸡个数for(i=0; i<=20; i++)//公鸡{for(j=0; j<=33; j++)//母鸡{if( (15*i + 9*j + (100-i-j)) == 300){printf("公鸡%d，母鸡%d，小鸡%d\n", i, j, 100-i-j);}}}}//1,2,5凑100银币问题int main3(){int count = 0;//情况数int i,j;//5分个数，2分个数for(i=0; i<=20; i++)//5分个数{for(j=0; j<=50; j++)//2分个数{if( ( 5*i + 2*j ) <= 100 ){count++;printf("%d: 5分%d个，2分%d 个，1分%d个\n", count, i, j, 100-5*i-2*j);}}}}//8.一维数组的最大值、最小值、平均值#include <stdio.h>#define N 10//宏定义常量int main(){int i;//下标索引int max, min;double sum = 0;//累加和int a[N] = {58, 58, 96, 100, 25, 55, 66, 88, 99, 77};max = a[0];//假设第一个最大min = a[0];//假设第一个最小for(i=1; i<N; i++){if(a[i] > max)//比最大值还大max = a[i];//你才是最大if(a[i] < min)//比最小值还小min = a[i];//你才是最小sum += a[i];}printf("max=%d, min=%d\n", max, min);printf("average = %.2lf\n", sum/N);}//9.二维数组的最大值、最小值、平均值#include <stdio.h>int main(){int i; //第几行int j; //第几列int a[3][4] = { {1,2,3,4}, {5,-6,7,8}, {9,19,39,0}};int max = a[0][0];//假设你最大int min = a[0][0];//假设你最小double average;//平均值double sum = 0; //总和for(i=0; i<3; i++)//必定3行{for(j=0; j<4; j++)//必定4列{printf("%5d ", a[i][j]);sum += a[i][j];if(a[i][j] > max)max = a[i][j];if(a[i][j] < min)min = a[i][j];}printf("\n");}average = sum / (3*4);printf("max=%d, min=%d, avg=%.2lf\n", max, min, average);}//10.二维数组转置#include <stdio.h>//二维数组转置：行变列，列变行int main(){int i; //第几行int j; //第几列int a[3][4] = { {1,2,3,4}, {5,-6,7,8}, {9,19,39,0}};int b[4][3];for(i=0; i<3; i++){for(j=0; j<4; j++){printf("%5d", a[i][j]);}printf("\n");}//矩阵转置for(i=0; i<3; i++){for(j=0; j<4; j++){b[j][i] = a[i][j];}}for(i=0; i<4; i++){for(j=0; j<3; j++){printf("%5d", b[i][j]);}printf("\n");}}//11.冒泡排序#include <stdio.h>#define N 10//宏定义常量int main(){int i;//下标索引int j;int tmp;//临时交换用int a[N] = {58, 58, 96, 100, 25, 55, 66, 88, 99, 77};//外层循环一定是N-1for(i=0; i<N-1; i++){//两两交换，大的往后走for(j=0; j<N-i-1; j++){//交换if(a[j] > a[j+1]){tmp = a[j];a[j] = a[j+1];a[j+1] = tmp;}}}for(i=0; i<N; i++){printf("%d ", a[i]);;}printf("\n");}//12.结构冒泡排序#include <stdio.h>//结构定义,用户自定义类型typedef struct student{char sno[20];//学号char name[20];//姓名int age;//年龄char gender;//性别char tel[20];//电话};int main(){int i;int j;double sum = 0;struct student tmp;//两两交换临时用;//结构数组struct student team[5];for(i=0; i<5; i++){printf("请输入第%d个队员的信息:\n", i+1);scanf("%s %s %d %c %s", team[i].sno, team[i].name, &team[i].age, &team[i].gender, team[i].tel);}//按年龄冒泡排序for(i=0; i<5; i++){for(j=0; j<5-i-1; j++){//两两交换if(team[j].age > team[j+1].age){tmp = team[j];team[j] = team[j+1];team[j+1] = tmp;}}}//取值printf("%-12s %-10s %-5s %-5s %-15s\n", "学号", "姓名", "年龄", "性别", "电话");for(i=0; i<5; i++){printf("%-12s %-10s %-5d %-5c %-15s\n", team[i].sno, team[i].name, team[i].age, team[i].gender, team[i].tel);}}//13.结构数组找年龄最大值#include <stdio.h>//结构定义,用户自定义类型typedef struct student{char sno[20];//学号char name[20];//姓名int age;//年龄char gender;//性别char tel[20];//电话};int main(){int i;struct student tmp;//找最大临时用//结构数组struct student team[5];for(i=0; i<5; i++){printf("请输入第%d个队员的信息:\n", i+1);scanf("%s %s %d %c %s", team[i].sno, team[i].name, &team[i].age, &team[i].gender, team[i].tel);}//取值printf("%-12s %-10s %-5s %-5s %-15s\n ", "学号", "姓名", "年龄", "性别", "电话");for(i=0; i<5; i++){printf("%-12s %-10s %-5d %-5c %-15s\ n", team[i].sno, team[i].name, team[i].age, team[i].gender, team[i].tel);}//找学号最大的那一个tmp = team[0];for(i=1; i<5; i++){if(strcmp(team[i].sno,tmp.sno) >0 ){tmp = team[i];}}printf("学号最大的队员如下:\n");printf("%-12s %-10s %-5d %-5c %-15s\ n", tmp.sno, , tmp.age, tmp.gender, tmp.tel);}//14.文件读写#include <stdio.h>#include <stdlib.h>//结构定义,用户自定义类型typedef struct student{char sno[20];//学号char name[20];//姓名int age;//年龄char gender;//性别char tel[20];//电话};//文件读写int main(){struct student * s, * p1;//个数未知FILE * fp;int i, n = 0;char buf[1024];//fgets缓冲区//打开文件fp = fopen("e:\\test.txt", "r");while(fgets(buf, 1024, fp) != NULL)n++;fclose(fp);//指向一个可以存储n个student结构的内存空间s = (struct student *)malloc(sizeof(struct student) * n);p1 = s;//不要动头位置s的值//打开文件fp = fopen("e:\\test.txt", "r");for(i=0; i<n; i++){//从文件中读入一行fscanf(fp, "%s %s %d %c %s", p1->sno, p1->name, &p1->age, &p1->gender, p1->tel);p1++;}fclose(fp);p1 = s;for(i=0; i<3; i++){printf("%s %s %d %c %s\n", p1->sno, p1->name, p1->age, p1->gender, p1->tel);}free(s);}//15.输入三角形三边长计算周长和面积#include<stdio.h>#include<math.h>int main(){double area,perimeter,s,a,b,c;printf("请输入三边长a b c:");scanf("%lf%lf%lf",&a,&b,&c);if((a+b>c) && (a+c>b) && (b+c>a)){s=(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c));perimeter=a+b+c;printf("area=%.2f,perimeter=%.2f\ n",area,perimeter);}else{printf("三边长无法构成三角形。

/* A simple game*//＊CopyRight： Guanlin＊/ #include<stdio。

h〉＃include〈stdlib。

h〉＃include<string.h〉#include〈time。

h>＃include〈conio。

h>#include<process.h〉struct object_fix{char name[20]；char id[5];char desc［500];char action[30］;char im[5]；};struct object_move｛char name[20];char id［5];char desc[500];int loc；int pwr；int strg;char im［5］；｝;struct rover{char name［20］;char id［5];char desc［500］;int pwr；int strg；int location[2];char im［5］;};struct map /* this is the map structure*/｛char data[20］;char add_data[20］；int amount；int x； /* this were the successor keeps it's x ＆ y values*/int y;};struct location /*this structure is for the successor lister*/{float height;char obj；｝;void stats_update（int selected， struct rover ＊p_rover）{switch （selected）｛case 1：if(p_rover->pwr 〈 7)printf（"\n\nYou do not have enough power to perform this action!\n\n”）；else{(p_rover—〉pwr）—= 7;printf("You have destroyed the object！\n\n")；｝break;case 2：if（p_rover->pwr 〈 3)printf（”\n\nYou do not have enough power to perform this action！\n\n"）; else if(p_rover—〉strg > 90)printf（"\n\nYou do not have enough storage space for this object!\n\n"）；｛（p_rover-〉pwr) —= 3；(p_rover—>strg） += 10；printf（"You have collected a sample of the object！\n\n"）;}break；case 3：p_rover->pwr -= 10; /*Distance around object— value gained from mapper module. 1 square = -1 power*/printf（”You have avoided the object！\n\n”)；break；case 4：p_rover—>pwr —= 2;printf（"You have driven through the obstacle!\n\n”)；break；case 5：if（p_rover—〉pwr == 100)printf(”\n\nYou do not need to charge up!\n\n")；else{p_rover—〉pwr = 100;printf(”You have charged up your rover!\n\n”）；}break；default：printf("\n\n＊*＊＊＊ERROR＊＊＊*＊\nInvalid Selection\n\n”)；break;｝}void action（char object， struct rover ＊p_rover）｛int selection;switch(object）case 1：printf（”\nYou have encountered： A Sandy Rock\n\n"）;printf（”This object can be：\n1.\tDestroyed\n2.\tCollected\nPlease choose action 1 or 2:\t"); scanf("％d”， &selection）;stats_update(selection， p_rover)；break；case 2:printf(”\nYou have encountered: A Solid Rock\n\n"）;printf（”This object can be：\n1。

C语言入门基础代码（20条案例）下面是20条基础案例：1. 输出Hello, World!#include <stdio.h> // 使用标准输入输出库int main() {printf("Hello, World!\n"); // 输出字符串return 0; // 返回程序执行成功}2. 判断一个数是否为偶数#include <stdio.h> // 使用标准输入输出库int main() {int num; // 定义变量printf("请输入一个整数：");scanf("%d", &num); // 从控制台输入一个整数if(num % 2 == 0) { // 如果余数为0说明是偶数printf("%d 是偶数\n", num);} else {printf("%d 是奇数\n", num);}return 0;}3. 计算两个数的和#include <stdio.h> // 使用标准输入输出库int main() {int a, b; // 定义变量int sum; // 定义变量printf("请输入两个整数：");scanf("%d%d", &a, &b); // 从控制台输入两个整数sum = a + b; // 求和printf("%d + %d = %d\n", a, b, sum); // 输出结果return 0;}4. 求一个数的平方#include <stdio.h> // 使用标准输入输出库int main() {int num; // 定义变量int square; // 定义变量printf("请输入一个整数：");scanf("%d", &num); // 从控制台输入一个整数square = num * num; // 求平方printf("%d 的平方是%d\n", num, square); // 输出结果return 0;}5. 判断一个字符是否为数字#include <stdio.h> // 使用标准输入输出库#include <ctype.h> // 使用字符函数库int main() {char ch; // 定义变量printf("请输入一个字符：");scanf("%c", &ch); // 从控制台输入一个字符if(isdigit(ch)) { // 判断是否为数字printf("%c 是数字\n", ch);} else {printf("%c 不是数字\n", ch);}return 0;}6. 计算数组元素的平均值#include <stdio.h> // 使用标准输入输出库int main() {int arr[] = {1, 2, 3, 4, 5}; // 定义数组int len = sizeof(arr) / sizeof(int); // 数组长度int sum = 0; // 定义变量int avg; // 定义变量for(int i = 0; i < len; i++) { // 遍历数组sum += arr[i]; // 累加求和}avg = sum / len; // 求平均值printf("数组的平均值是%d\n", avg); // 输出结果return 0;}7. 按照下标访问数组元素#include <stdio.h> // 使用标准输入输出库int main() {int arr[] = {1, 2, 3, 4, 5}; // 定义数组int len = sizeof(arr) / sizeof(int); // 数组长度for(int i = 0; i < len; i++) { // 遍历数组printf("arr[%d] = %d\n", i, arr[i]); // 输出每个元素}return 0;}8. 使用指针访问数组元素#include <stdio.h> // 使用标准输入输出库int main() {int arr[] = {1, 2, 3, 4, 5}; // 定义数组int len = sizeof(arr) / sizeof(int); // 数组长度int *p = arr; // 把数组首地址赋给指针变量for(int i = 0; i < len; i++) { // 遍历数组printf("arr[%d] = %d\n", i, *(p + i)); // 输出每个元素}return 0;}9. 求Fibonacci 数列的第n 项#include <stdio.h> // 使用标准输入输出库int main() {int n; // 定义变量int a = 0, b = 1, c; // 定义变量printf("请输入一个正整数：");scanf("%d", &n); // 从控制台输入一个整数for(int i = 1; i <= n; i++) { // 求Fibonacci 数列的第n 项c = a + b;a = b;b = c;}printf("Fibonacci 数列的第%d 项是%d\n", n, a); // 输出结果return 0;}10. 使用递归计算阶乘#include <stdio.h> // 使用标准输入输出库int factorial(int n) { // 定义递归函数if(n == 0 || n == 1) {return 1;} else {return n * factorial(n - 1);}}int main() {int n; // 定义变量printf("请输入一个非负整数：");scanf("%d", &n); // 从控制台输入一个整数int result = factorial(n); // 调用递归函数计算阶乘printf("%d 的阶乘是%d\n", n, result); // 输出结果return 0;}11. 判断一个数是否是质数#include <stdio.h>#include <stdbool.h>bool isPrime(int num) {if(num <= 1) {return false; // 小于等于1的数都不是质数}for(int i = 2; i * i <= num; i++) { // 只要从2到根号num遍历就可以了if(num % i == 0) {return false; // 如果存在因子，则不是质数}}return true;}int main() {int num;printf("请输入一个整数：");scanf("%d", &num);bool result = isPrime(num); // 调用isPrime函数if(result) {printf("%d 是质数\n", num);} else {printf("%d 不是质数\n", num);}return 0;}12. 计算圆的面积和周长#include <stdio.h>const double PI = 3.1415926;int main() {double r, area, perimeter;printf("请输入圆的半径：");scanf("%lf", &r);area = PI * r * r; // 计算面积perimeter = 2 * PI * r; // 计算周长printf("圆的面积是%.2f，周长是%.2f\n", area, perimeter);return 0;}13. 计算斐波那契数列的前n 项#include <stdio.h>int main() {int n;printf("请输入要输出的斐波那契数列项数：");scanf("%d", &n);int a = 0, b = 1, c; // 定义三个变量for(int i = 1; i <= n; i++) { // 输出前n项斐波那契数列printf("%d ", a);c = a + b;a = b;b = c;}printf("\n"); // 换行return 0;}14. 嵌套循环输出九九乘法表#include <stdio.h>int main() {for(int i = 1; i <= 9; i++) { // 控制行数for(int j = 1; j <= i; j++) { // 控制列数printf("%d*%d=%-2d ", j, i, i * j); // 左对齐输出}printf("\n"); // 换行}return 0;}15. 获得数组的最大值和最小值#include <stdio.h>int main() {int arr[] = {3, 5, 8, 1, 4, 9, 6, 2, 7};int len = sizeof(arr) / sizeof(int);int max = arr[0], min = arr[0]; // 假设第一个元素既是最大值也是最小值for(int i = 1; i < len; i++) {if(arr[i] > max) { // 更新最大值max = arr[i];}if(arr[i] < min) { // 更新最小值min = arr[i];}}printf("数组的最大值是%d，最小值是%d\n", max, min);return 0;}16. 判断一个数是否为回文数```c#include <stdio.h>#include <stdbool.h>bool isPalindrome(int num) {if(num < 0) { // 负数不是回文数return false;}int temp = num, reversed = 0; // 定义需要用到的变量while(temp != 0) { // 反转整数reversed = reversed * 10 + temp % 10;temp /= 10;}return (num == reversed); // 如果反转后等于原来的数，则为回文数}int main() {int num;printf("请输入一个整数：");scanf("%d", &num);bool result = isPalindrome(num);if(result) {printf("%d 是回文数\n", num);} else {printf("%d 不是回文数\n", num);}return 0;}17. 将字符串反转输出#include <stdio.h>#include <string.h>int main() {char str[100];printf("请输入一个字符串：");scanf("%s", str);int len = strlen(str);for(int i = len - 1; i >= 0; i--) { // 倒序输出printf("%c", str[i]);}printf("\n"); // 换行return 0;}18. 将一个二维数组按列排序#include <stdio.h>void sortCols(int arr[][3], int rows) {for(int j = 0; j < 3; j++) { // 按列排序for(int i = 0; i < rows - 1; i++) {for(int k = i + 1; k < rows; k++) {if(arr[i][j] > arr[k][j]) { // 比较大小并交换int temp = arr[i][j];arr[i][j] = arr[k][j];arr[k][j] = temp;}}}}}int main() {int arr[][3] = {{2, 5, 9}, {7, 6, 1}, {4, 3, 8}};int rows = sizeof(arr) / sizeof(arr[0]); // 计算数组的行数sortCols(arr, rows); // 调用函数排序for(int i = 0; i < rows; i++) { // 输出排序后的数组for(int j = 0; j < 3; j++) {printf("%d ", arr[i][j]);}printf("\n"); // 换行}return 0;}19. 判断一个字符串是否为回文串#include <stdio.h>#include <string.h>#include <stdbool.h>bool isPalindrome(char str[]) {int len = strlen(str);for(int i = 0; i < len / 2; i++) { // 判断左右字符是否一样if(str[i] != str[len - i - 1]) {return false;}}return true;}int main() {char str[100];printf("请输入一个字符串：");scanf("%s", str);bool result = isPalindrome(str); // 调用函数判断是否为回文串if(result) {printf("%s 是回文串\n", str);} else {printf("%s 不是回文串\n", str);}return 0;}20. 将一个整数转换成二进制数并输出#include <stdio.h>void decToBin(int num) {if(num > 1) { // 递归调用decToBin(num / 2);}printf("%d", num % 2); // 每次输出余数}int main() {int num;printf("请输入一个十进制数：");scanf("%d", &num);printf("%d 的二进制数为", num);decToBin(num); // 调用函数输出二进制数printf("\n"); // 换行return 0;}。

#include<stdio.h>main(){float pi=3.14159265,r;printf("enter radius:\n");scanf("%f",&r);printf("r=%.2f,c=%.2f,area=%.2f\n",r,2*pi*r,pi*r*r);system("pause");}#include<stdio.h>main(){int m,n,x,y;printf("inputm,n:\n");scanf("%d%d",&m,&n);if (n%2==1){printf("error!! n bu shi ji shu!\n",n);return;}/*n在这里不能是奇数*/x=(4*m-n)/2;y=(n-2*m)/2;if((x>=0)&&(y>=0))printf("x=%d,y=%d\n",x,y);elseprintf("shu ru cuo wu!\n");getch();}#include<stdio.h>#include<math.h>#include<stdlib.h>main(){float a,b,C;printf("enter 3number(a,b,C):\n"); scanf("%.2f %.2f %.2f",&a,&b,&C); s=0.5*a*b*sinC;printf("s=%.2f\n",s);system("pause");}#include<stdio.h>main(){int ds,nl,yf;char c;printf("shu ru ds;\n");scanf("%d",&ds);if (ds<14||ds>1184){printf("input error!press any end...\n");scanf("%c",&c);exit(0);}/*输入的数字必须是-14~1184之间*/nl=(ds+115)%100;yf=(ds+115)/100;printf("nl=%d,yf=%d\n",nl,yf);system("pause");}#include<stdio.h>#include<string.h>main(){char s1[100],s2[100],s3[100],s4[100];printf("input a string:\n");gets(s1);strcpy(s1,s2);strcat(s1,"--------------");strcpy(s3,strcat(s1,"--------------"));strcat(strcpy(s3,strcat(s1,"--------------")),s2);strcpy(s4,strcat(strcpy(s3,strcat(s1,"--------------")),s2)); puts(s4);system("pasue");getch();}#include<stdio.h>#include<math.h>main(){float x1,x2,a,b,c;printf("input 3 number(a,b,c):\n"); scanf("%f%f%f",&a,&b,&c);x1=(-b+sqrt(b*b-4*a*c))/(2*a);x2=(-b-sqrt(b*b-4*a*c))/(2*a); printf("x1=%f,X2=%f\n",x1,x2); system("pause");getch();}#include<stdio.h>main(){int a,b,c,t;printf("input 3 number:\n");scanf("%d%d%d",&a,&b,&c);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;}printf("1:%d,2:%d,3:%d\n",a,b,c);system("pause");}#include<stdio.h>#include<stdlib.h>#include<conio.h>main(){float pi=3.14159265,r;textbackground(YELLOW);/* 设置背景色为黄色，注意颜色应该大写，可更改 */ textcolor(RED); /* 设置文件颜色为红色，可更改 */clrscr(); /* 清屏，使设置生效 */printf("enter radius:");scanf("%f",&r);if(r<0)printf("Enter Error!\n");elseprintf("r=%.2f,c=%.2f,area=%.2f\n",r,2*pi*r,pi*r*r);system("pause");/* 暂停，按任一键继续 */#include<stdio.h>#include<math.h>#include<conio.h>main(){float a,b,c,delt,x1,x2,p,q;textcolor(YELLOW);clrscr();printf("Input a b c:\n");scanf("%f%f%f",&a,&b,&c);if(a==0){printf("It's not a quadratic equation!\n"); system("pause");return;}delt=b*b-4*a*c;if(delt>=0){x1=(-b+sqrt(delt))/(2*a);x2=(-b-sqrt(delt))/(2*a);printf("x1=%.3f x2=%.4f\n",x1,x2);}else{p=-b/(2*a);q=sqrt(-delt)/(2*a);printf("p=%.4fq=%.4f\n",p,q);}system("pause");getch();}}#include<stdio.h>main(){float pi=3.14159265,r;int k=0;while(k<=3){printf("enter radius:\n");scanf("%f",&r);printf("r=%.2f,c=%.2f,area=%.2f\n",r,2*pi*r,pi*r*r); printf("press any key to continue\npress esc to exit."); k++;}}#include<stdio.h>#include<stdlib.h>#include<time.h>#include<conio.h>main(){int a,b,c,oper;long limit,i=0;char char1;textcolor(GREEN);/*设置字体颜色为绿色*/clrscr(); /*清屏，是设置生效*/while(i<=3){printf("qing xuan ze jia huo jian(1or2,1:+,2:-\n"); scanf("%d",&oper);printf("Enter max (<10000):\n");scanf("%ld",&limit);srand((unsigned long)time(0));a=rand()*limit/RAND_MAX;b=rand()*limit/RAND_MAX;while((a<b)&&(oper==2)){a=rand()*limit/RAND_MAX;b=rand()*limit/RAND_MAX;}char1=(oper==2?'-':'+');printf("%d%c%d\n",a,char1,b);scanf("%d",&c);if((oper==2&&a-b==c)||(oper!=2&&a+b==c))printf("OK!You are very clever!\n");elseprintf("The result is not correct!\n");i++;}getch();}#include<stdio.h>#include<conio.h>main(){int y,i=0;textcolor(YELLOW);/*天下事无难易之分只有做与不做之别*/ textbackground(GREEN);clrscr();/*清屏，是设置生效*/while(i<=3){printf("Input year:\n");scanf("%d",&y);if(y%4==0){if(y%100==0){if(y%400==0)printf("y shi run nian!\n");elseprintf("y bu shi run nian !\n");}elseprintf("y shi run nian!\n");}elseprintf("y bu shi run nian!");i++;}getche();}#include<stdio.h>#include<time.h>#include<string.h>main(){int xz,wday1,hour1;struct tm *timeptr;time_t secsnow;char s1[30],s2[30],s3[30];printf("input whom do you say to?:\n"); scanf("%d",&xz);if(xz==1)strcpy(s1,"mother");else if(xz==2)strcpy(s1,"father");elsestrcpy(s1,"");time(&secsnow);timeptr=localtime(&secsnow); wday1=timeptr->tm_wday;if(wday1==6)strcpy(s2,"Happy saturday!"); else if(wday1==0)strcpy(s2,"Happy sunday"); elsestrcpy(s2,"");hour1=timeptr->tm_hour;if(hour1>=4&&hour1<=10) strcpy(s3,"Good morning!"); else if(hour1>=17&&hour1<=22) strcpy(s3,"Good afternoon!"); elsestrcpy(s3,"Good evening!"); printf("%s%s%s",s1,s2,s3); getch();}#include<stdio.h>#include<conio.h>main(){int day,year,month,i=0;textbackground(BROWN);clrscr();while(i<=3){printf("Input 2 number:\n");scanf("%d%d",&year,&month);switch(month){case 1:case 3:case 5:case 7:case 8:case 10:case 12: day=31;break;case 4:case 6:case 11:day=30;break;case 2:day=28;if((year%4==0&&year%100!=0)||year%400==0)day=29;break;deflault:printf("Invalid month input!\n");return;}printf("There are%d days in %d.%d\n",day,year,month);i++; getch(); }}。

C语言简单程序代码C语言程序 5-3#include<stdio.h> void main(){char ch;int b,s=0;while((ch=getchar())!='\n'){if(ch<='9'&&ch>='0'){ b=ch-'0';s=s+b;}}printf("%d",s);getchar();}5-4:#include<stdio.h> void main(){int a,b,i,s=0,n;scanf("%d,%d",&a,&b);n=a>b?b:a;for(i=1;i<=n;i++){if(a%i==0&&b%i==0)s=i;}printf("%d",s);getchar();}5-5:#include<stdio.h> void main() { char ch;while((ch=getchar())!='\n') { if(ch<='Z'&&ch>='A')ch=ch+32;printf("%c",ch);}}5-6:#include<stdio.h> void main() {int i,n;float a=1,b=2,s=0,t;scanf("%d",&n);for(i=1;i<=n;i++){s=s+b/a;b=a+b;a=b-a;}printf("%.4f",s); }5-7:#include<stdio.h> void main() {int a[10];int i,t,s;for(i=0;i<=9;i++)scanf("%d",&a[i]);s=a[0];for(i=1;i<=9;i++){if(a[i]>s)s=s;else s=a[i];}printf("%d",s); }1031:(统计单词)#include<stdio.h> void main() {int n=0,a=0;char ch;while((ch=getchar())!='\n'){if(ch==' ')a=0;else if(a==0){ n=n+1;a=1;}}printf("%d",n);}1042:(富翁问题)#include<stdio.h> void main() {int m,i,a=0,b=0;float s;s=0.1;scanf("%d",&m);for(i=1;i<=38;i++){a=a+m*i;s=2*s;b=b+s;if(a<b)break;}printf("%d",i+1); }1028:(素数)#include<stdio.h> void main(){int i,j,t,n=0;for(i=2;i<=200;i++){for(j=2;j<i;j++){ if(i%j==0) break;}if(j==i){ printf("%d",i);n=n+1;if(n%1==0)printf("\n");/*printf要受外面的if控制，否则n为30时隔了很多个数才有素数，搞到要连续换行*/}}}1035:(菱形)#include<stdio.h> void main(){int i,j,n,a;scanf("%d",&n);n=2*n+1;for(i=1;i<=n;i++){a=(n+1)/2;for(j=1;j<=(i<a?a-i:i-a);j++)printf(" ");for(j=1;j<=(i<=a?2*i-1:2*(n-i)+1);j++)printf("*");printf("\n");}}1038:打印图案(只限数字1~9) #include<stdio.h> void main() {int i,j,n,a,b,e,f,g;char ch,d;ch='1';scanf("%d",&n);n=2*n-1;a=(n+1)/2;for(i=1;i<=n;i++){for(j=1;j<=(i<a?a-i:i-a);j++)printf(" ");for(j=1;j<=(i<=a?2*i-1:2*(n-i)+1);j++){if(i<=a){ if((b=ch-'0')<=i){ printf("%c",ch);ch=ch+1;d=ch;}else{d=d-2;printf("%c",d); d=d+1;}}else{e=n-i+1;if((f=ch-'0')<=e) {printf("%c",ch); ch=ch+1;g=ch;}else{g=g-2;printf("%c",g); g=g+1;}}}ch='1';printf("\n");}}改进版:(适合所有数)#include<stdio.h> void main(){int i,j,n,a,b,e,f,g;int ch,d;ch=1;scanf("%d",&n);n=2*n-1;a=(n+1)/2;for(i=1;i<=n;i++){for(j=1;j<=(i<a?a-i:i-a);j++)printf(" ");for(j=1;j<=(i<=a?2*i-1:2*(n-i)+1);j++) {if(i<=a){ if((b=ch-0)<=i){ printf("%d",ch);ch=ch+1;d=ch;}else{d=d-2;printf("%d",d);d=d+1;}}else{e=n-i+1;if((f=ch-0)<=e){printf("%d",ch);ch=ch+1;g=ch;}else{g=g-2;printf("%d",g);g=g+1;}}}ch=1;printf("\n");}}1039#include<stdio.h> void main() {int a[10],i;for(i=0;i<=9;i++)scanf("%d ",&a[i]);for(i=9;i>=0;i--)printf(" %d",a[i]); }1040:(自制的)#include<stdio.h> void main(){int a[21],b=20,j,i,c=0;for(i=1;i<=20;i++)scanf("%d",&a[i]);for(i=1;i<=20;i++){for(j=i+1;j<=20;j++){if(a[i]==a[j]){ c=c++;break;}}}b=b-c;printf("%d",b); }#include<stdio.h> (别人的)void main(){int a[20],i,j,n=0; for(i=0;i<20;i++) scanf("%d",&a[i]); for(i=0;i<20;i++) {for(j=0;j<i;j++)if(a[i]==a[j]&&i!=j) {n++;break;}}printf("%d\n",20-n);}1062:#include<stdio.h> void main(){int a[3][4];int i,j,c,n=0;for(i=0;i<=2;i++) {for(j=0;j<=3;j++){scanf("%d",&a[i][j]);}}for(j=0;j<=3;j++) { for(i=0;i<=2;i++) {c=a[i][j];printf("%d ",c);n++;if(n%3==0)printf("\n");}}}冒泡排序:#include<stdio.h> void main(){int a[10];int i,j,t;for(i=0;i<=9;i++)scanf("%d",&a[i]);for(j=0;j<=8;j++){for(i=0;i<=(9-j);i++)if(a[i]>a[i+1]){t=a[i];a[i]=a[i+1];a[i+1]=t;}}for(i=0;i<=9;i++)printf("%d ",a[i]); }高精度计算:#include<stdio.h> void main(){char ch;int a[100],b[100],i=1,c[100],d[100],e=1,h,j,k; while((ch=getchar())!='\n'){a[i]=ch-'0';i++;}while((ch=getchar())!='\n') {b[e]=ch-'0';e++;}i--;e--;h=(i>e?i:e);d[h]=0;k=h;for(;h!=0;h--){ c[h]=(a[i]+b[e]+d[h])%10; d[h-1]=(a[i]+b[e])/10;i--;e--;if(e==0){b[1]=0;e++;}if(i==0){a[1]=0;i++;}}for(j=1;j!=(k+1);j++)printf("%d",c[j]); } 1121:#include<stdio.h>#include<string.h>void main(){char s[20];strcpy(s,"abcdefghijklmn");printf("%s",s);}1123:#include<stdio.h>#include<string.h>void main(){char s[50];printf("what's your name?");gets(s);printf("your name is ");printf("%s",s);}1122:#include<stdio.h> #include<string.h> void main() {char s1[100],s2[100],s3[100];gets(s1);gets(s2);gets(s3);strcat(s1,s2);printf("%s",s1);printf("%s",s3); }1050:#include<stdio.h> #include<string.h> void main() {char s1[100],s2[100];int i,j,a,b,p,c,d,n;gets(s1);gets(s2);a=strlen(s1);b=strlen(s2);p=1;i=0;j=0;while(p==1){if(s1[i]==s2[j]){ n=i;c=i;d=j;for(;d<=(b-1);d++){if(s1[c]==s2[d])c++;else break;}if(b==d)p=0;}i++;}printf("%d ",n+1); }1059:#include<stdio.h> int max(int m,int n) { int r;while((r=m%n)!=0){m=n;n=r;}return n;}void main(){int a,b,n;scanf("%d%d",&a,&b);printf("%d\n",max(a,b));}1083:#include<stdio.h> int fac(int n) {int s=1;while(n!=1){s=s*n;n--;}return s;}void main(){int n;scanf("%d",&n);printf("%d",fac(n));}1124:#include<stdio.h> int fl(int x){static int z=3,y=0;y++;z++;return(x+y+z); }void main(){int a=1,k;for(k=0;k<3;k++)printf("%4d",fl(a)); }。

由键盘任意输入1个4位数整数，分别输出其中的个位、十位、百位、千位。

/* expe 3-10 */#include <stdio.h>#include <math.h>void main(void){int mun,a,b,c,d;scanf("%d",&mun);a=mun / 1000; /*千位*/b=(mun % 1000) / 100; /*百位*/c=(mun % 100) / 10; /*十位*/d=(mun % 10); /*个位*/printf("千位数字为=%d\n",a);printf("百位数字为=%d\n",b);printf("十位数字为=%d\n",c);printf("个位数字为=%d\n",d);}由键盘任意输入3个数据，找出其中的最大数和最小数。

#include<stdio.h>void main(void){float a,b,c,k,g;/* k 小g 大*/printf ("请输入三个数");scanf("%f%f%f",&a,&b,&c);if (a < b){k = a;g = b;}else{k = b;g = a;}if (k < c)/*最小*/{ printf ("\n最小的数=%5.2f",k);}else{printf ("\n最小的数=%5.2f",c);}if (g > c)/*最大*/{printf ("\n最大的数=%5.2f",g);}else{printf ("\n最大的数=%5.2f",c);} }判断三角形的形状#include<stdio.h>#include<math.h>void main(void){printf("请输入三角形三边");float a,b,c,p,s,k1,k2,k3;scanf("%f%f%f",&a,&b,&c);while (a + b < c || b + c < a || a + c < b ){printf("不能构成三角形，请重新输入");scanf("%f%f%f",&a,&b,&c);}k1 = a * a;k2 = b * b;k3 = c * c;if (a == b && b == c && c ==a){printf("此三角形为等边三角形");}else if (a == b || b == c || c ==a){printf("此三角形为等腰三角形"); }else if ((k1 == b * b + c * c) || (k2 == a * a + c *c) || (k3 = a * a + b * b)){printf("此三角形为直角三角形");}else{printf("此三角形为一般三角形");} }九九乘法表整体#include <stdio.h>void main(void){int i,j;for (i = 1;i < 10; i ++){for(j = 1;j < 10; j ++){printf("%5d",i * j);}printf("\n"); } }右半边#include <stdio.h>void main(void){int i,j;for (i = 1;i < 10; i ++){for(j = 1;j <= i; j ++){ printf("%5d",i * j);}printf("\n"); } }左半边#include <stdio.h>void main(void){int i,j;for (i = 1;i < 10;i ++)/*最外层循环*/ {for (j = 1;j < i; j++)/*打空格*/{ printf(" "); }for (j = 1;j <= 10 - i;j ++)/*计算*/{printf("%5d",j * i); }printf("\n"); } }打印菱形#include<stdio.h>void main(void){int i,j,k;for (i = 1;i <= 5;i ++){for (j = 0;j < 5 - i;j ++){printf(" ! "); }for (k = 1;k <= 2 * i - 1;k ++){printf(" * "); }printf("\n");}for (i = 4;i >= 0;i --){for (j = 4 - i;j > 0;j --){printf(" ! "); }for (k = 2 * i ;k >= 0;k --){ printf(" * ");}printf("\n"); } }找回文#include<stdio.h>#include<string.h>void main(void){char str[80];int i,j,iStrlenstr,iFlag;printf("请输入字符串\n");gets(str);iStrlenstr = strlen(str);for (i = 0 ,j = iStrlenstr - 1;i <= j ;i ++, j --){if (str[i] == str[j]){iFlag = 1; }else{iFlag = 0;break; }}if (iFlag == 1){printf("输入的是回文！\n"); }else{printf("输入的不是回文！\n"); }}找名字指针法/*不用查找函数，用指针的方法*/#include<stdio.h>void main(void){char str[10][80],a[80],*p[10],*q = NULL;int i, j,iFlag = 0;// int istrlenstr;printf("请输入名字\n");for ( i = 0 ; i < 10; i ++){gets(str[i]);}printf("请输入想查找的名字\n");gets(a);for (i = 0; i < 10; i ++){p[i] = str[i]; }q = a;for (i = 0; i < 10; i ++ ){iFlag = 0;j = 0;while(*(p[i] + j) && *(q + j)){if (*(p[i]+ j) != *(q + j)){break; }j++;}if (*(p[i] + j)== '\0' && *(q + j) == '\0'){ iFlag = 1;break; }}if (iFlag == 1)printf("FOUND ! 该名字的位置为%d",i);elseprintf("NOT FOUND ！"); }/*利用指针给10个数排序*/#include<stdio.h>int main(void){int a[10],*p = NULL ,iTem;int i,j,iPos = 0;printf("请输入10个数\n");for (i = 0; i < 10; i ++){scanf("%d",&a[i]); }p = a;for(i = 0; i < 9; i ++){iPos = i;for (j = i + 1 ; j < 10 ;j ++){if (a[j]< a[iPos])iPos = j;}iTem = *(a + i);*(a + i) = *(a + iPos);*(a + iPos) = iTem;}printf("排序之后的为");for (i = 0; i < 10; i ++){printf("%4d",*(a + i)); }return 0; }/*名字排序，从大到小*/#include<stdio.h>#include<string.h>void main(void){char a[10][10],cTemp[10];int i,j,iMax;printf("输入十个学生姓名：\n");for(i = 0; i < 10; i ++){gets(a[i]);}for(i = 0;i < 10 ;i ++){iMax = i;for(j = i + 1;j < 10;j ++){if(strcmp(a[iMax],a[j]) < 0){iMax = j;}}if(iMax != i){strcpy(cTemp,a[i]);strcpy(a[i],a[iMax]);strcpy(a[iMax],cTemp);}}printf("按照字典降序排序为：\n");for(i = 0;i < 10;i ++){puts(a[i]);} }/*查找并删除某字符*/#include<stdio.h>int main(){char str[80],*p = NULL,*q;char t;printf("请输入字符串:\n");gets(str);printf("请输入想要删除的字符:\n");t = getchar();p = str;q = str;for (p = str; *p != '\0'; p ++){if (*p != t){*q++ = *p; }}*q = '\0';puts(str);}函数作业（全部）/*交换器，引用全局变量*/方法一int a,b;void main(void){scanf("%d%d",&a,&b);fun();printf("a=%d,b=%d\n",a,b);}void fun(void){int c;c = a;a = b;b = c;}方法二#include<stdio.h>#define swap(x,y) {int tmp=x;x=y;y=tmp;}int main(){int x,y;printf("请输入两个数字\n");scanf("%d%d",&x,&y);swap(x,y);printf("交换之后的数字是\n");printf("%d\t%d\t",x,y);return 0;}/*用函数找最大公约数*/#include<stdio.h>int maxd(int,int);int main(){int a,b,d;printf("请输入两个整数\n");scanf("%d%d",&a,&b);d = maxd(a,b);printf("这两个数的最大公约数为：%d",d);return 0;}int maxd(int a,int b){int m,n,k;if(a<b){m = b;n = a;}else{m = a;n = b;}do{k = m%n;m = n;n = k;}while(n != 0);return(m);}/*用函数统计*/#include<stdio.h>int icount(char* );int main(){char str[80];int m = 0;printf("请输入字符串\n");gets(str);m = icount(str);printf("字符串中数字的个数有：%d",m);return 0;}int icount(char *p){int k = 0;while( *p != '/0'){if (*p >= '0' && *p <= '9')k ++;}return k;}/*排序函数*/#include<stdio.h>#include<string.h>void iSort (int[],int);int main(){int a[10];int i;printf("请输入10个整数\n");for (i = 0; i < 10 ; i ++){scanf("%d",&a[i]); }iSort(a,10);printf("从小到大排序为\n");for (i = 0; i < 10; i ++){ printf("%4d",a[i]); } }void iSort(int x[],int n){int i,j,t,iPos;for (i = 0; i < n - 1; i ++){iPos = i;for (j = i + 1; j < n; j ++){if (x[j] < x[iPos])iPos = j ;}if (iPos != i){t = x[i];x[i] = x[iPos];x[iPos] = t; } } }/*用函数找素数*/#include<stdio.h>int iPrime(int);int main(){int i,k = 0;for (i = 1; i < 201; i += 2){k = iPrime(i);if (k == 1)printf("%d\n",i); } }int iPrime(int x){int a;for (a = 2; a <= x/2; a ++){if (x % a == 0)return 0;}return 1; }/*八进制转十进制*/#include<stdio.h>int iChange(char*);int main(){char s[10];int i,k;printf("请输入一个八进制的数");gets(s);k = iChange(s);printf("对应的十进制的数位=%d",k); }int iChange(char *x){char *p;int n = 0;p = x;for(;*p != '\0'; p ++){n = n * 8 + *p - '0'; } }/*用函数将矩阵转置规定是方阵*/#include<stdio.h>void change(int[][4]);int main(){int a[4][4],b[4][4]={0};int i,j;printf("请输入一个四阶矩阵\n");for (i = 0; i < 4; i ++){for (j = 0; j < 4 ;j ++){ scanf("%d",&a[i][j]); }}change(a);printf("转置过后的矩阵式\n");for (i = 0; i < 4; i ++){for (j = 0; j < 4 ;j ++){printf("%3d",a[i][j]);}printf("\n"); } }void change(int x[][4]){int i,j,t;for (i = 0;i < 4; i ++){for (j = 0; j < i; j ++){t = x[i][j];x[i][j] = x[j][i];x[j][i] = t; } } }/*判断是否是对称矩阵以4*4 的矩阵为例*/#include<stdio.h>int dui(int[][4]);int main(){int a[4][4],i,j,k = 0;printf("请输入一个四阶矩阵\n");for (i = 0; i < 4; i ++){for (j = 0; j < 4 ;j ++){scanf("%d",&a[i][j]);}}k = dui(a);if (k == 1){printf("该矩阵为对称矩阵"); }else{printf("该矩阵不是对称阵");} }int dui(int x[][4]){int i,j,t = 0;for (i = 0;i < 4; i ++){for (j = 0; j < i; j ++){if (x[i][j] == x[j][i])t = 1;} }return t;}/*用函数求cos与sin*/#include<stdio.h>#include<math.h>float icos(float);float isin(float);int main() {float a,cosx,sinx;printf("请输入x\n");scanf("%f",&a);cosx = icos(a);sinx = isin(a);printf("cos(x)=%7.2f\n",cosx);printf("sin(x)=%7.2f\n",sinx);}float icos(float a){int n = 2;float t,k,fcos;k = 0;t = 1;do{t *= (-1) * a * a / (n *( n - 1));k += t;n += 2;}while (fabs(t) >= 1e-6);fcos = 1 + k;return fcos;}float isin(float a){float fsin;fsin=sqrt(1 - (double)icos(a) * (double)icos(a));return fsin;}/*int n = 3;float t,k,fsin;k = 0;t = 1;do{t *= (-1) * a * a / (n * (n - 1));k += t;n += 2;}while (fabs(t) >= 1e-6);fsin =1 + k;return fsin;*//*用函数分别统计26个字母的个数*/#include<stdio.h>void jishu(char str[]);int iCount1[26] = {0};void main(void){char str[80];int i;printf("请输入字符串");gets(str);jishu(str);printf("26个大写字母的个数分别是\n");for (i = 0; i < 26; i ++){printf("%d\n",iCount1[i]);}}void jishu(char x[]){int i;for (i = 0; x[i] != '\0'; i ++){if (x[i] >= 'A' && x[i] <= 'Z'){iCount1[x[i] - 'A'] ++; } } }位运算/*地位字节按位取反*/#include<stdio.h>void main(void){unsigned int x;printf("请输入数据：");scanf("%d",&x);x = x ^ 0X00ff;printf("%x\n",x);} /*循环移位通过位或运算来实现循环的功能*/#include<stdio.h>void main(void){int a,n;printf("请输入一个整数：\n");scanf("%d",&a);printf("请输入移动的位数：\n");printf("注意：正数代表右移，负数代表左移");scanf("%d",&n);if(n > 0){a = ((a >> n) | (a << ((8 * sizeof(int)) - n)));//右移}if(n < 0){a = ((a << (- n)) | (a >> ((8 * sizeof(int)) - (-n))));//左移}printf("%u\n",a);}/*利用位异或运算加密*/#include<stdio.h>int main(){int stc,code,dst;dst = 0;//加密后code = 1234;//密码printf("请输入明文：\n");scanf("%d",&stc);dst = stc ^ code;printf("\n加密之后的文件是：%d\n",dst);return 0;}/*偶数为清零*/#include<stdio.h>void main(void){int a;printf("请输入");scanf("%d",&a);a = a & 0x5555;printf("%x\n",a);}/*十六进制转二进制*/#include<stdio.h>void main(void){int a,b[32],c = 1,i;scanf("%x",&a);for(i = 0; i < 32; i ++){b[i] = (a & c) >> i;c <<= 1;}for(i = 31; i >= 0; i --){ printf("%d",b[i]); } }员工工资#include<stdio.h>#define N 1struct man{long ch;char nam[10];int year;float fareJB;float fareYJ;float fareYF;float fareBX;float fareSD;float fareSF;};void fare(struct man *p) {struct man *q;for(q=p;q<p+N;q++){q->fareYF=p->fareJB+p->fareYJ;q->fareSF=q->fareYF-q->fareBX-q->fareSD;}for(q=p;q<p+N;q++){printf("应发工资\t实发工资\n");printf("%5.2f\t%5.2f\n",q->fareYF,q->fareSF);} }void PRINTF(struct man *p){struct man *q=p;printf("职工工号\t姓名\t年龄\t基本工资\t业绩工资\t应发工资\t保险费\t\t水电费\t实发工资\t\n");for(q=p;q<p+N;q++){printf("%8d%10s\t%d\t%8.2f\t%8.2f\t%8.2f\t%8.2f\t%8.2f\t%8.2f\t",q->ch,q->nam,q->year,q->fareJB,q->fareYJ,q->fareYF,q->fareBX,q->fareSD,q->fareSF);} }void main(void){struct man person[N],*per;printf("输入员工信息");for(per=person;per<person+N;per++){gets(per->nam);scanf("%d%d%f%f%f%f",&per->ch,&per->year,&per->fareJB,&per->fareYJ,&per->fareBX,&per->fareSD);}fare(person);PRINTF(person);}部门销售情况管理程序#include<stdio.h>#define N 1struct bumen{long num;char name[20];float get[4];float ave;}a[N];void chazhao(struct bumen *p){long NUM;int i;printf("输入要查找的部门的代码:");scanf("%ld",&NUM);printf("\n");for(i=0;i<N;i++){if((p+i)->num==NUM){break;}}printf("部门代码\t部门名称\t春季销售额\t 夏季销售额\t秋季销售额\t冬季销售额\t平均值\n");printf("%ld\t %6s\t\t%8.2lf\t%8.2lf\t%8.2 lf\t%8.2lf\t%8.2lf\t\n",p->num,p->name,p->get[0],p->get[1],p->get[2],p->get[3],p->ave);}void qiuave(struct bumen *p){int i,j;float sum=0;for(i=0;i<N;i++){for(j=0;j<4;j++){sum=sum+p[i].get[j];}p[i].ave=sum/4;} } void order(struct bumen *p){struct bumen *min,P;int i,j,k;for(i=0;i<N-1;i++){min=&p[i];for(j=i+1;j<N;j++){if(p[j].ave<min->ave)min=&p[j];}P=p[i];p[i]=*min;*min=P;}printf("部门代码\t部门名称\t春季销售额\t夏季销售额\t秋季销售额\t冬季销售额\t平均值\n");for(k=0;k<N;k++){printf("%ld\t %6s\t\t%8.2lf\t%8.2lf\t%8.2lf\t%8.2lf\t%8.2lf\t\n",p[k].num,p[k].name,p[k].get[0],p[k].get[1],p[k].get[2],p[k].get[3],p[k].ave);}}void main(void){int i,j,n,x;float t;printf("输入部门数据");for(i=0;i<N;i++){scanf("%ld",&a[i].num);scanf("%s",&a[i].name);for(j=0;j<4;j++){scanf("%f",&t);a[i].get[j]=t;}}printf("1.输入部门代码或部门名称，查找此部门的销售情况\n2.计算各部门的平均销售额。

C语言初学者经典代码（5条）1.打印“Hello, world!”#include <stdio.h>int main() {printf("Hello, world!");return 0;}这段代码使用了C标准库中的printf()函数，它能够在控制台中打印文本信息。

在main()函数中调用该函数，并传入字符串“Hello, world!”作为参数。

程序运行后，在控制台中就能看到输出的文本信息。

2.计算两个数的和并输出结果：#include <stdio.h>int main() {int a = 5, b = 2;int sum = a + b;printf("The sum of %d and %d is %d", a, b, sum);return 0;}这段代码定义了两个整型变量a和b，并将它们的值分别设置为5和2。

然后将它们相加得到和并赋值给整型变量sum。

最后通过printf()函数输出结果文本信息。

其中%d是占位符，表示输出一个整型变量的值。

3.判断一个数是否为偶数：#include <stdio.h>int main() {int num = 4;if (num % 2 == 0) {printf("%d is an even number.", num);} else {printf("%d is an odd number.", num);}return 0;}这段代码定义了一个整型变量num，并将它的初始值设置为4。

然后使用if语句判断num是否为偶数。

如果是，就输出相应的文本信息；如果不是，也输出相应的文本信息。

在if语句中，%d同样表示输出一个整型变量的值。

%s表示输出一个字符串的值。

4.输出乘法表：#include <stdio.h>int main() {for (int i = 1; i <= 9; ++i) {for (int j = 1; j <= i; ++j) {printf("%d*%d=%d ", j, i, i*j);}printf("\n");}return 0;}这段代码使用了两个嵌套的for循环，分别控制行和列的输出。