#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<time.h>
//目标字符串dest查找原字符串src
char* my_strstr(char*src,char*ch)
{
char*fsrc=src;
char*rsrc=src;
char*tdest=dest;
while(*fsrc)
{
rsrc=fsrc;
while(*fsrc==*dest&&*fsrc!=' ')
{
*fsrc++;
*dest++;
}
if(*tdest==' ')
{
return rsrc;
}
//回滚
tdst=dest;//目标字符串更新到起始位置
fsrc=rsrc;
fsrc++:
}
return NULL;
}
int main()
{
char src[]="hello world";
char dest[]="llo";
char*p=my_strstr(src,dest);
printf("%s ",p);
return EXIT_SUCCESS;
}