Program to calculate GCD of two numbers.cpp

#include <iostream>
using namespace std;

int gcd(int a, int b)
{
    if (a == 0)
        return b;
    return gcd(b % a, a);
}

int main()
{
    int num1, num2;
    cout << "Enter two numbers: ";
    cin >> num1 >> num2;
    cout << "GCD of " << num1 << " and " << num2 << " is: " << gcd(num1, num2);
    return 0;
}