【C】#反向输出一个四位数#

#include <stdio.h>

int main() {
    int n, tmp = 0;
    while (scanf("%d", &n) != EOF) {
        while (n) {
            tmp *= 10;
            tmp = n % 10 + tmp;
            n /= 10;
        }
    }
    printf("%04d", tmp);
    return 0;
}