3_13_倒序输出hello,world

#include "string.h"

 #include "stdio.h"

 #include "malloc.h"

 main(void)

 {

  char *src="hello,world";

  char *dest=NULL;

  dest=(char *)malloc(sizeof(char)*(strlen(src)+1));

  int len=strlen(src);

  char *d=dest;

  //char *s=src+len-1;

  char *s=&src[len-1];

  while(len--!=0)

  *d++=*s--;

  *d='\0';

  printf("%s",dest);

 }