Tìm ưcln bcnn

#include<iostream>
using namespace std;
int UCLN(int a, int b)
{
    while (b != 0)
    {
        int r = a%b;
        a = b;
        b = r;
    }
    return a;
}

int BCNN(int a, int b)
{

    return a*(b / UCLN(a, b));
}

int main()
{
    int a, b;
    cout << "Nhap a=";
    cin >> a;
    cout << "Nhap b=";
    cin >> b;
    cout << "UCLN(" << a << "," << b << ")=" << UCLN(a, b) << endl;
    cout << "BCNN(" << a << "," << b << ")=" << BCNN(a, b) << endl;
    system("pause");
}