题解 | 求四位数各个数位之和

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int a = n / 1000;
    int b = (n / 100) % 10;
    int c = (n / 10) % 10;
    int d = n % 10;
    cin >> a >> b >> c >> d;
    int sum = a + b + c + d;
    cout << sum << endl;
}
// 64 位输出请用 printf("%lld")