实现功能
实现查找子串功能
在字符串中查找对应的子串,如果有返回字符串第一个字母的位置,如果没有返回-1
测试源码
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int myStrstr(char * str, char * subStr)
{
int num = 0;
while (*str != '\0')
{
if (*str != *subStr)
{
str++;
num++;
continue;
}
//创建临时指针
char * tmpStr = str;
char * tmpSubStr = subStr;
while (*tmpSubStr != '\0')
{
if (*tmpStr != *tmpSubStr)
{
//匹配失败
str++;
num++;
break;
}
tmpStr++;
tmpSubStr++;
}
if (*tmpSubStr == '\0')
{
//匹配成功
return num;
}
}
return -1;
}
void test01()
{
char * str = "abcdefgdnf";
int ret = myStrstr(str, "dnf");
if (ret == -1)
{
printf("未找到子串\n");
}
else
{
printf("找到了子串,位置为:%d\n", ret);
}
}
int main(){
test01();
system("pause");
return EXIT_SUCCESS;
}