#include<stdio.h>
#include<string.h>
void reverse_str(char *str)
{
int len = 0;
char
temp;
len = strlen(str);
temp =
str[0];
str[0] = str[len-1];
str[len-1] =
'\0'; //必须要保证str+1还是一个字符串
if(*(str+1) !=
'\0') //递归必须要有跳出条件
reverse_str(str+1);
str[len-1] =
temp; //递归会保存现场
}
int main()
{
char p[] =
"happy";
reverse_str(p);
printf("%s\n",p);
return
0;
}