编辑代码

#include <stdio.h>
int main () {
    int x;
    scanf("%d",&x);
    int digit;
    int ret = 0;

    while ( x>0){
        digit = x%10;
        //printf("%d",digit);
        ret = ret*10+digit;
        x/=10;
    }
    printf("%d",ret);
    return 0;
}