#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char *mystrchr(char *str, char c)
{
int i;
for (i = 0; i<strlen(str); i++)
{
if (*(str + i) == c)
{
return str + i;
}
}
return NULL;
}
int main()
{
char *str = "abcdef";
char c = ‘s‘;
char *fin = mystrchr(str, c);
printf("%s", fin);
system("pause");
return 0;
}原文：https://blog.51cto.com/14232799/2393382