欧几里得算法 Euclidean algorithm

突然发现我连int main里标准的参数都不会写。尴尬啊，哈哈哈哈…

// Euclidean algorithm
// 欧几里得算法
#include <iostream>
using namespace std;

int gcd(int p, int q)
{
    if (q == 0) return p;
    int r = p % q;
    return gcd(q, r);
}

int main(int argc, char* argv[])
{
    int a, b;
    cout << "Enter two number for gcd calculation: ";
    cin >> a >> b;

    cout << gcd(a, b) << endl;

    return 0;
}