题解 | 数字颠倒

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

int exchange(char *str);

int main() 
{
    char str[11] = {'0'};
    scanf("%s",str);

    if(str[0] == '0')
    {
        printf("0\n");
    }
    else 
    {
        exchange(str);
        printf("%s",str);
    }

    return 0;
}

int exchange(char *str)
{
    int len = strlen(str);
    for(int i = 0;i <len/2;i ++)
    {
        char t = str[i];
        str[i] = str[len-1-i];
        str[len-1-i] = t;
    }
    return 0;
}