strstr函数实现

#include <iostream> using namespace std; const char * myStrstr(const char * src, const char *sub_str) { for (int index = 0; src[index] != '\0'; index++) { int j = 0; int temp = index; if (src[index] == sub_str[j]) { while (src[index++] == sub_str[j++]) { if (sub_str[j] == '\0') { return &src[index - j]; } } index = temp; } } return NULL; } int main() { char *strSrc = "123456789"; char *strSub = "34"; cout<<myStrstr(strSrc,strSub); return 0; }