c语言 9-9

1、

#include <stdio.h>

void rev_put(char x[])
{
    int i, len = 0;
    while(x[len])
        len++;
    for(i = 0; i < len / 2; i++)
    {
        char tmp = x[i];
        x[i] = x[len - 1 - i];
        x[len - 1 - i] = tmp;
    }
    printf("result: %s\n", x);
}

int main(void)
{
    char str[129];
    printf("str: "); scanf("%s", str);
    
    rev_put(str);
    return 0; 
}