字符串反序

/* 字符串反转 */

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

void reverse(char *s)
{
    int tmp;
    char *head = s;
    char *tail = NULL;

    for (tail = head+(strlen(s)-1); head < tail; head++, tail--) {
        tmp = *head;
        *head = *tail;
        *tail = tmp;
    }
}

int main(void)
{
    char buff[] = "i love china";

    puts(buff);
    reverse(buff);
    puts(buff);

    return 0;
}