题解 | #Primary Arithmetic#模拟进位

#include <iostream>
using namespace std;
int main() {
    int a, b;
    while (cin >> a >> b) {
        if (a == 0 && b == 0) break;
        int carry = 0, ans = 0;
        while (a != 0 || b != 0) {
            int temp = a % 10 + b % 10 + carry;
            if (temp >= 10) {
                carry = temp / 10;
                ans++;
            } else {
                carry = 0;
            }
            a /= 10;
            b /= 10;
        }
        if (ans == 0) cout << "NO carry operation." << endl;
        else if (ans == 1) cout << ans << " carry operation." << endl;
        else cout << ans << " carry operations." << endl;
    }
    return 0;
}