c语言判断是否以某个字符串开头，以某个字符串结尾

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已于 2022-09-03 17:45:58 修改

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分类专栏： C编程语言文章标签： c语言蓝桥杯

于 2022-09-03 16:27:29 首次发布

本文链接：https://blog.youkuaiyun.com/github_37412255/article/details/126679125

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#include <stdio.h>
#include <string.h>

/**
* 字符串originString以字符串prefix开头，返回0；否则返回1；异常返回-1
*/
int startWith(const char *originString, char *prefix) {
	// 参数校验
	if (originString == NULL || prefix == NULL || strlen(prefix) > strlen(originString)) {
		printf("参数异常，请重新输入！\n");
		return -1;
	}
	
	int n = strlen(prefix);
	int i;
	for (i = 0; i < n; i++) {
	    if (originString[i] != prefix[i]) {
		    return 1;
		}
	}
	return 0;
}

/**
* 字符串originString以字符串end结尾，返回0；否则返回1；异常返回-1
*/
int endWith(const char *originString, char *end) {
	// 参数校验
	if (originString == NULL || end == NULL || strlen(end) > strlen(originString)) {
		printf("参数异常，请重新输入！\n");
		return -1;
	}
	
	int n = strlen(end);
	int m = strlen(originString);
	int i;
	for (i = 0; i < n; i++) {
	    if (originString[m-i-1] != end[n-i-1]) {
		    return 1;
		}
	}
	return 0;
}

int main()
{
   char a[128] = "12345";
   char b[128] = "1";
   char *c = "2";
	
   char e[128] = "12345";
   char f[128] = "5";
   char *g = "4";
	
   printf("Flag1 = %d\n", startWith(a, b));
   printf("Flag2 = %d\n", startWith(a, c));
	
   printf("Flag3 = %d\n", endWith(e, f));
   printf("Flag4 = %d\n", endWith(e, g));

   return 0;
}

下面为方便非csdn用户复制代码：

#include <stdio.h>
#include <string.h>

/**
* 字符串originString以字符串prefix开头，返回0；否则返回1；异常返回0
*/
int startWith(const char *originString, char *prefix) {
   // 参数校验
   if (originString == NULL || prefix == NULL || strlen(prefix) > strlen(originString)) {
       printf("参数异常，请重新输入！\n");
       return -1;
   }

   int n = strlen(prefix);
   int i;
   for (i = 0; i < n; i++) {
   if (originString[i] != prefix[i]) {
       return 1;
       }
   }
   return 0;
}

/**
* 字符串originString以字符串end结尾，返回0；否则返回1；异常返回0
*/
int endWith(const char *originString, char *end) {
   // 参数校验
   if (originString == NULL || end == NULL || strlen(end) > strlen(originString)) {
       printf("参数异常，请重新输入！\n");
       return -1;
   }

   int n = strlen(end);
   int m = strlen(originString);
   int i;
   for (i = 0; i < n; i++) {
   if (originString[m-i-1] != end[n-i-1]) {
       return 1;
       }
   }
   return 0;
}

int main()
{
char a[128] = "12345";
char b[128] = "1";
char *c = "2";

char e[128] = "12345";
char f[128] = "5";
char *g = "4";

printf("Flag1 = %d\n", startWith(a, b));
printf("Flag2 = %d\n", startWith(a, c));

printf("Flag3 = %d\n", endWith(e, f));
printf("Flag4 = %d\n", endWith(e, g));

return 0;
}