Bai3.cpp

#include <iostream>
using namespace std;

int ucln(int a, int b)
{
    cout << a << " " << b << "\n";
    if (b == 0) {
        return a;
    }
    else {
        return ucln(b, a % b);
    }
}

int main()
{
    int a, b;
    do {
        cout << "Nhap vao so nguyen a: ";
        cin >> a;
        cout << "Nhap vao so nguyen b: ";
        cin >> b;
    } while (a == 0 || b == 0);

    cout << "Uc chung lon nhat a va b: " << ucln(a, b);

    return 0;
}