C语言库函数 strrchr -

http://www.fzs8.net/C_Function/2007-06-13/c_5917.html
函数名: strrchr
功  能: 在串中查找指定字符的最后一个出现
用  法: char *strrchr(char *str, char c);
程序例:

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

int main(void)
{
   char string[15];
   char *ptr, c = 'r';

   strcpy(string, "This is a string");
   ptr = strrchr(string, c);
   if (ptr)
      printf("The character %c is at position: %d/n", c, ptr-string);
   else
      printf("The character was not found/n");
   return 0;
}