C语言程序实例

1、精选优质文档-倾情为你奉上数组的引用：#include<stdio.h>void main (int argc,char *argv )int x5 = 2,3,1,4,6 ;int i;for (i = 0; i < 5; i+)printf("%dn", 2 * xi);一维数组的遍历：#include<stdio.h>void main(int argc, char *argv)int x5 = 1,2,3,4,5 ;int i = 0;for (i = 0; i < 5; i+)printf("x%d:%dn"

2、, i, xi);一维数组的最值：#include<stdio.h>int main(int argc, char* argv)int x5 = 1,2,3,4,5 ;int nMax = x0;int i = 0;for (i = 1; i < 5; i+)if (xi > nMax)nMax = xi;printf("max:%dn", nMax);return 0;一维数组排序：#include<stdio.h>void main(int argc, char * argv)int arr5 = 9, 8, 3, 5, 2 ;int

3、 temp = 0;int i, j;printf("冒泡排序前： n");for (i = 0; i < 5; i+)printf("%d ", arri);printf(" n");for (i = 0; i < 5-1; i+)for (j = 0; j < 5 - 1 - i; j+)if (arrj > arrj + 1) temp = arrj;arrj = arrj + 1;arrj + 1 = temp; printf("冒泡排序后： n"); for (i = 0; i &

4、lt; 5; i+) printf("%d ", arri); printf("n");二维数组的遍历#include<stdio.h>void main()/声明并初始化数组int array34 = 1,2,3,4,5,6,7,8,9,10,11,12 ;for (int i = 0; i < 3; i+)/循环遍历行for (int j = 0; j < 4; j+)/循环遍历列printf("%d%d: %d ", i, j, arrayij);printf("n");/每一行的末尾

5、添加换行符二维数组应用#include <stdio.h>void main(int argc, char * argv)int StuScore53 = /张同学88,70,90,/王同学80,80,60,/李同学89,60,85,/赵同学80,75,78,/周同学70,80,80,;int m = 0, n = 0;int nStuTotalScore;int nMathTotalScore = 0;int nChineseTotalScore = 0;int nEnglishTotalScore = 0;printf("个人总成绩：n");for (m =

6、 0; m < 5; m+)nStuTotalScore = 0;for (n = 0; n < 3; n+)nStuTotalScore += StuScoremn;switch (n)case 0:nMathTotalScore += StuScorem0;break;case 1:nChineseTotalScore += StuScorem1;break;case 2:nEnglishTotalScore += StuScorem2;switch (m)case 0:printf("张同学：%dn", nStuTotalScore);break;case

7、 1:printf("王同学：%dn", nStuTotalScore);break;case 2:printf("李同学：%dn", nStuTotalScore);break;case 3:printf("赵同学：%dn", nStuTotalScore);break;case 4:printf("周同学：%dn", nStuTotalScore);break;printf("小组数学总分：%d 小组数学平均分：%.2fn",nMathTotalScore, (double)nMathTot

8、alScore / 5);printf("小组语文总分：%d 小组语文平均分：%.2fn",nChineseTotalScore, (double)nChineseTotalScore / 5);printf("小组英语总分：%d 小组英语平均分：%.2fn",nEnglishTotalScore, (double)nEnglishTotalScore / 5);无参函数#include <stdio.h>void func()printf("这是我的第一个函数！n");void main()func();有参函数调用无参

9、函数#include <stdio.h>void func(int x, int y)int sum = x + y;printf("x+y=%dn", sum);void main()func(3, 5);函数调用及返回过程#include<stdio.h>int func(int x, int y)return x + y;void main()int sum = func(3, 5);printf("x+y=%dn", sum);Printf函数#include<stdio.h>void main()printf

10、("%c %c", 'H', 'n');printf("%s", "Hellow,world!n");printf("%d %d %d n",1, 2, 3);printf("%f %f %f n",2.1, 2.2);Scanf 函数#include<stdio.h>void main()char str256; /字符数组保存得到的字符串scanf("%s", str);printf("%sn", str);

11、嵌套函数#include<stdio.h>int max2(int a, int b) /用于比较两个整数大小的函数if (a > b)return a;elsereturn b;int max4(int a, int b, int c, int d) /用于比较四个整数大小的函数int res;res = max2(a, b);res = max2(res, c);res = max2(res, d);return res;void main()int a = 5, b = 7, c = 9, d = 22, max;printf("请输入四个整数: 5 7 9

12、22 n");/scanf("%d %d %d %d", a=5, b=7, c=9, d=22);max = max4(a, b, c, d);printf("max=%d n", max);递归调用#include<stdio.h>/下面的函数使用递归实现，求1n的和int getsum(int n)if (n = 1)return 1; /满足条件，递归结束int temp = getsum(n - 1); /在函数体中调用自身return temp + n;void main()int sum = getsum(4);/调用

13、递归函数，获得14的和printf("sum=%dn", sum); /打印结果外部函数建立源文件first.cint add(int x, int y)return x + y;建立源文件second.c#include<stdio.h>extern int add(int x, int y);void main()printf("%dn", add(1, 2);/注：extern 可以省略内部函数用法建立first.c#include<stdio.h>void show()printf("%sn", &qu

14、ot;first.c");建立second.c#include<stdio.h>static void show()printf("%sn", "second.c");void main()show();全局变量#include<stdio.h>int x = 123;void show()printf("show()函数中，x的值为：%dn", x);void main()show();printf("main()函数中，x的值为：%dn",x);当局部变量与全局变量重名时，全局

15、变量会被屏蔽#include<stdio.h>int x = 789;void main()int x =123;printf("x的值为：%dn",x);变量的作用域#include<stdio.h>int x = 10;void show()int x = 20;printf("show()函数中，x的值为：%dn", x);void main()int x = 30;printf("main()函数中，x的值为%dn", x);show();If 语句 #include<stdio.h>voi

16、d main()/定义变量xint x = 5;/如果x的值小于10则执行if大括号中的代码if (x < 10)x+;printf("x=%dn", x);If.else语句#include<stdio.h>void main()int num = 19;if (num % 2 = 0)/判断条件成立，num被2整除printf("num是一个偶数n");elseprintf("num是一个奇数n");If.else if.else语句#include<stdio.h>void main()int gr

17、ade = 75;/定义学生成绩if (grade >= 80)/满足条件grsde >= 80printf("该成绩的等级为优n");else if (grade >= 70)/不满足条件grade >=80,但满足条件grade>=70printf("该成绩等级为良n");else if (grade >= 60)/不满足条件 grade >=70,但满足条件grade >=60printf("该成绩等级为中n");else/不满足条件 grade >=60printf(&qu

18、ot;该成绩的等级为差n");三元运算符#include<stdio.h>void main()int x = 0;int y = 1;int max;max = x > y ? x : y;printf("max = %dn");Switch 语句#include<stdio.h>void main()int week = 5;switch (week)case 1:printf("星期一n");break;case 2:printf("星期二n");break;case 3:printf(&

19、quot;星期三n");break;case 4:printf("星期四n");break;case 5:printf("星期五n");break;case 6:printf("星期六n");break;case 7:printf("星期日n");break;default:printf("输入的数字不正确.n");break;在使用switch语句过程中，如果多个case条件后面的执行语句是一样的，则该执行语句只需书写一次即可#include<stdio.h>void m

20、ain()int week = 2;switch (week)case 1:case 2:case 3:case 4:case 5:/当week满足值1、2、3、4、5中任意一个时，处理方式相同printf("今天是工作日n");break;case 6:case 7: /当week满足值6、7中任意一个时，处理方式相同printf("今天是休息日n");break;While 循环语句#include<stdio.h>void main()int x = 1;while (x <= 4)printf("x = %dn&quo

21、t;, x);/条件成立，打印x的值x+; /x进行自增Do-while 循环语句#include<stdio.h>void main()int x = 1; /定义变量x，初始值为1doprintf("x=%dn", x);/条件成立，打印x的值x+; /x进行自增 while (x <= 4); /循环条件For 循环#include<stdio.h>void main()int x = 1; /定义变量x，初始值为1doprintf("x=%dn", x);/条件成立，打印x的值x+; /x进行自增 while (x

22、<= 4); /循环条件Break 语句#include<stdio.h>void main()int x = 1; /定义变量x，初始值为1while (x <= 4) /循环条件printf("x=%dn", x);if (x = 3)break;x+; /x进行自增 Goto语句#include<stdio.h>int main() int i, j; /定义两个循环变量for (i = 1; i <= 9; i+) /外层循环for (j = 1; j <= i; j+) /内层循环if (i >4) /判断i的

23、值是否大于4goto end; /跳至标志位end的语句printf("*"); /输出*printf("n"); /换行end: return 0;Continue 语句#include<stdio.h>void main()int sum = 0; /定义变量sum，用于记住和for (int i = 1; i <= 100; i+)if (i % 2 = 0) /如果i是一个偶数，执行if语句中的代码continue; /结束本次循环sum += i; /实现sum和i的累加printf("sum = %dn"

24、, sum);无符号整数类型#include<stdio.h>void main()int a = 12345;long b = -23456, sum1;unsigned int c = 32800, sum2;sum1 = b - a;sum2 = c - b;printf("sum1=%1d,sum2=%un", sum1, sum2);Float 和double之间的数据转换#include<stdio.h>void main()float a;a = 3.;printf("a=%.9fn", a);字符型变量#inclu

25、de<stdio.h>void main()char ch1 = 'A'char ch2 = 65;printf("%cn", ch1);printf("%cn", ch2);#include<stdio.h>void main()转义符的用法char ch1 = 'A'char ch2 = 'n'char ch3 = 'B'char ch4 = ''printf("%c", ch1);printf("%c",

26、ch2);printf("%c", ch3);printf("%c", ch4);printf("%c", ch2);枚举类型变量#include<stdio.h>enum month JAN=1,FEB=2,MAR=3,APR=4,MAY=5,JUN=6, JUL=7,AUG=8,SEP=9,OCT=10,NOV=11,DEC=12;void main()enum month lastmonth, thismonth, nextmonth;lastmonth = APR;thismonth = MAY;nextmonth

27、 = JUN;printf("%d %d %d n", lastmonth, thismonth, nextmonth); 在枚举中规定，如果不给标识符指定具体值，会默认该标识符的值等于前一标识符的值加一。因此可以快速定义#include<stdio.h>/定义一组常量enum Constants c1, c2, c3 = 4, c4, c5 = 3, c6, c7, c8 = '0', c9 ;void main()printf("c9=%dn", c9);Sizeof 运算符#include <stdio.h>

28、void main()/通过类型名称计算各基本数据类型所占内存大小printf("char: %dn", sizeof(char);printf("short: %dn", sizeof(short);printf("long: %dn", sizeof(long);printf("float: %dn", sizeof(float);printf("double: %dn", sizeof(double);printf("unsigned char: %dn", sizeo

29、f(unsigned char);printf("unsigned short: %dn", sizeof(unsigned short);printf("unsigned int: %dn", sizeof(unsigned int);printf("unsigned long: %dn", sizeof(unsigned long);/通过变量名称计算变量所属数据类型占用内存大小int val_int = 100;double val_double = .0;printf("val_int: %dn", siz

30、eof(val_int);printf("val_double: %dn", sizeof(val_double);指针的取址和取值运算符#include<stdio.h>void main()int num = 100; /int类型变量numprintf("num=%dn", num); /输出变量值printf("#&num = %pn", &num); /输出变量的内存地址printf("*&num = %dn", *&num); /通过num地址读取num中的数

31、据指针表达式的自增自减运算#include<stdio.h>void main()int arr5 = 1,2,3,4,5 ;int *p1 = &arr0;int *p2 = &arr3;printf("p1的值为： %dn", *p1);printf("+p1的值为： %dn", *(+p1);printf("p2的值为： %dn", *p2);printf("-p2的值为: %dn", *(-p2);同类指针相减运算#include<stdio.h>void main(

32、)int arr5 = 1,2,3,4,5 ;int *p1 = &arr0;int *p2 = &arr3;printf("p1的值为： %dn", p1);printf("p2的值为： %dn", p2);printf("p1-p2的值为: %dn", p2-p1);指针变量的使用#include<stdio.h>void main(int argc,char* argv)int nNum = 0x;int * pNum; /定义一个指针变量pNum = &nNum; /为指针变量赋值print

33、f("nNum Val:%xn", nNum);printf("nNum Addr:%pn", &nNum);printf("pNum Val:%pn", pNum);printf("*pNum :%xn", *pNum);指针变量作为函数的参数（作用是将一个变量的地址传送到另一个函数中）#include<stdio.h>void main(int argc,char* argv)int nNum = 0x;int * pNum; /定义一个指针变量pNum = &nNum; /为指针变

34、量赋值printf("nNum Val:%xn", nNum);printf("nNum Addr:%pn", &nNum);printf("pNum Val:%pn", pNum);printf("*pNum :%xn", *pNum);指向一维数组元素的指针#include<stdlib.h>#include<stdio.h>void main(int argc, char* argv)int X10 = 1,2,3,4,5,6,7,8,9,10 ;int i = 0;int n

35、Len = 10;printf("数组X修改前：n");for (i = 0; i < 10; i+)printf("%d ", Xi);/用指针pTemp 指向数组Xint * pTemp = X;/通过指针pTemp访问数组中的元素，并修改元素的值for (i = 0; i < nLen; i+)pTempi = pTempi * 2;printf("n数组X修改之后：n");/通过指针移动来遍历输出X数组中的元素for (i = 0; i < 10; i+)printf("%d ", *pT

36、emp);pTemp+;printf("n");指向二维数组元素的指针#include<stdlib.h>#include<stdio.h>void main()int X25 = 1,2,3,4,5 , 6,7,8,9,10 ;/定义数组指针用于指向二维数组int(*pXElement)5 = X;int m = 0;int n = 0;printf("二维数组元素如下： n");for (m = 0; m < 2; m+)printf("第%d行的元素如下： n", m + 1);for (n = 0

37、; n < 5; n+)/通过数组指针来访问为数组中的元素printf(" %d", pXElementmn);printf("n"); 指针数组的概念#include<stdio.h>/输出指针数组中元素的值int print(int *arr, int n)if (!arr)return 0;int i = 0;for (i = 0; i<n; i+)printf("%dn", *arri);return 1;void main(int argc, char * argv)int a, b, c, d, e

38、;a = 1;b = 2;c = 3;d = 4;e = 5;int *Arr = &a, &b, &c, &d, &e ;/定义一个int类型的指针数组print(Arr, 5);/调出print（）函数指针数组作为main（）函数的形参#include<stdlib.h>#include<stdio.h>int main(int argc, char * argv)int i = 0;printf("程序的参数列表如下：n");for (i = 0; i < argc ; i+)printf(&quo

39、t;%s ", argvi);return 0;二级指针#include<stdlib.h>#include<stdio.h>void main(int argc, char * argv)int m = 10;int * pM = &m; /指针pM存放的是变量m的地址int * ppM = &pM; /二级指针ppM存放的是指针pM的地址printf("m = %dn", m);printf("*pM = %dn", *pM);printf("*pM = %dn", *ppM);M

40、alloc()函数和free（）函数#include<stdio.h>void main()int u, v; /定义二维数组的长和宽printf("第一维为：");scanf("%d", &u);printf("第二维为：");scanf("%d", &v);int* array = (int*)malloc(sizeof(int*)* u); /先创建第一维for (int i = 0; i < u; i+)/在内层循环中动态创建第二维arrayi = (int*)malloc

41、(sizeof(int)*v);for(int j = 0; j<v; j+)arrayij = 0; /给数组元素复制printf("%d ", arrayij);字符数组#include<stdio.h>void main()/声明一个字符数组并初始化char char_array5 = 'h', 'e', 'l', 'l', 'o' ;int i;/通过sizeof关键字得到数组长度，并遍历打印其内容。for (i = 0; i < sizeof(char_arra

42、y); +i)printf("%c", char_arrayi);printf("n");输出字符串中的字符#include<stdio.h>void main()char char_array6 = ("hello");/声明一个长度为6的字符数组并初始化为helloint i;/通过sizeof关键字得到数组长度for (i = 0; i < sizeof(char_array); +i)/通过printf输出char_array中的字符串printf("char_array的第%dn", i

43、, char_arrayi);获取用户输入字符的长度#define _CRT_SECURE_NO_WARNINGS /关闭安全检查#include<stdio.h>#include<string.h>void main()char str1024; /声明一个足够大的字符型数组保存将要被输入的字符串printf("请输入待测量的字符串:");scanf("%s", str); /接受用户输入字符串printf("您输入的字符串长度为 %d。n", strlen(str);空字符0的使用#include<s

44、tdio.h>void main()char char_array = 'h', 'e', 'l', 'l', 'o', '0', 'w', 'o', 'r', 'l', 'd' ;printf "%sn", char_array ;忘记在字符数组的末尾添加空字符0，程序也会出现一些奇怪的现象#include<stdio.h>void main()char char_array =

45、'h', 'e', 'l', 'l', 'o' ;printf "%sn", char_array ;使用指针修改字符串中的字符#include<stdio.h>int main()char char_array = "hello world!"char *ptr;printf("修改前的字符串如下：%sn", char_array);ptr = char_array; /将一个字符型指针指向字符型数组char_array的首地址/开始修改字符

46、串while (*ptr != '0') /检测是否到串未尾if (*ptr = ' ')*ptr = '!'ptr+;printf("修改后的字符串如下：%s n", char_array);return 0;Gets（）函数#pragma warning(disable:4996)#include<stdio.h>void main()char phoneNumber12;printf("请输入手机号码：");gets(phoneNumber);printf("您的手机号码是: %

47、sn", phoneNumber);Puts（）#pragma warning(disable:4996)#include<stdio.h>void main()char buf12;puts("请输入一个字符串：");gets(buf);puts("您输入的是: n");puts(buf);字符串比较#pragma warning(disable:4996)#include<stdio.h>#include<string.h>void main()char username100; /定义存放用户名的字符数

48、组char password100; /定义存放密码的字符数组printf("登录n");printf("请输入用户名： ");gets(username); /获取用户输入的用户名printf("请输入密码: ");gets(password); /获取用户输入的密码/比较输入的用户名和密码是否正确if (!strcmp(password, "ILoveC") && (!strcmp(username, "user")printf("用户 %s 登录成功！n"

49、;, username);elseprintf("登陆失败，请检查用户名或密码是否正确输入。n");Strncmp（）函数#include<string.h>#include<stdio.h>void main()char* str1 = "abcdef"char* str2 = "abcdeg"/判断字符串str1和str2中的前5个字符是否相同if (!strncmp(str1, str2, 5)printf("str1和str2的前5个字符相同");elseprintf("s

50、tr1和str2的前5个字符不同");Strchr（）函数#include<stdio.h>#include<string.h>int getcount(char* str, char c)/存储找到的字符个数int count = 0;/存储当前字符指针在字符串中的位置char* ptr = str;/获取第一次出现字符变量c值的指针位置while (ptr = strchr(ptr, c) != NULL)+ptr;+count;return count;void main() char str6 = "abaca"char c = &

51、#39;a'int num = getcount(str, c);printf("字符%c在字符串中出现了%d次。n", c, num);Strstr（）函数#pragma warning(disable:4996)#include<stdio.h>#include<string.h>void main()char str10240; /声明字符串数组，用于保存段落char word10240; /声明字符串数组，用于保存要查找的字符串char* ptr;printf("请输入要扫描的段落：");gets(str);pri

52、ntf("请输入要查找的单词：");gets(word);ptr = strstr(str, word); /搜索是否包含指定的字符串if (ptr = NULL)printf("段落中不包含单词 %s。n", word);else/得到检测出的字符串后20个字符if (strlen(ptr) >= 20)ptr20 = 0;printf("单词出现在 %s附近。n", ptr);Strcat（）函数#pragma warning(disable:4996)#include<stdio.h>#include<s

53、tring.h>void main()/区号char areaNumber5;/电话号码char phoneNumber12;int input;/分机号char extraNumber5;/用来存储连接后的结果，需要初始化为0！char buffer25 = 0 ;printf("请输入区号:");gets(areaNumber);printf("请输入电话号码:");gets(phoneNumber);printf("有分机号吗？（y/n)");input = getchar();/由于getchar（）只读入一个字符，因此

54、需要调用fflush来清除输入缓冲区的换行符fflush(stdin);if (input = 'y')printf("请输入分机号：");gets(extraNumber);strcat(buffer, areaNumber);strcat(buffer, "-");strcat(buffer, phoneNumber);strcat(buffer, "-");strcat(buffer, extraNumber);elsestrcat(buffer, areaNumber);strcat(buffer, "-");strc