更相减损法和辗转相除法

#include<iostream>

using namespace std;
//辗转相除
int gcd1(int num1, int num2){
    if(num2 == 0) return num1;
    return gcd1(num2, num1 % num2);
}
//更相减损
int gcd2(int num1, int num2){
    while(num1 != num2){
        if(num1 > num2) num1 -= num2;
        else num2 -= num1;
    }
    return num1;
}
int main(){
    int num1, num2;
    while(cin >> num1 >> num2){
        if(num1 < num2) swap(num1, num2);
        cout << gcd2(num1, num2) << endl;
    }
    return 0;
}