在串中查找指定字符的最后一个出现

[c]代码库

#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; 
}