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#include <stdio.h> #include <string.h>#include <stdlib.h>int main(int argc,const char *argv[]){  char src[] = "hello world";  int len=strlen(src);    char *dest = (char *)malloc(len+1);   //申请数组的大小的空间大小   char *a = &src[len-1];                 char *b=dest;   while(len-- != 0)  *b++ = *a--;  printf("%s\n",dest);  free(dest);  dest = NULL;  return 0;}