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#include <iostream>
using namespace std;
 
void GCD(int, int, int&);
 
int main(){
    char again = 'y';
    while (again == 'y' || again == 'Y'){
        int usr1, usr2, fetch = 0;
        cout << "GCD finder, enter 2 numbers: ";
        cin >> usr1 >> usr2;
 
        GCD(usr1, usr2, fetch);
        cout << "The GCD is: " << fetch << endl << endl;
 
        cout << "do you want to rerun(y|Y)? ";
        cin >> again;
    }
}
 
void GCD(int i1, int i2, int& out){
    out = 0; //reinitialize
 
    int c = i1 % i2;
    while (c != 0)
    {
        i1 = i2;
        i2 = c;
        c = i1 % i2;
    }
    out = i2;
 
}