7-28 求整数的位数及各位数字之和

#include <stdio.h>

int main(void)
{
    int num;
    int n, sum;

    n = 0;
    sum = 0;
    scanf("%d", &num);

    do
    {
        sum = sum + num % 10;
        num = num / 10;
        n++;
    } while (num > 0);

    printf("%d %d\n", n, sum);
    return 0;
}