C++ 輾轉相除法求最大公因數

#include <iostream>
using namespace std;
int main(){
    int a, b, t;
    cin >> a >> b;
    //(a,b)=(b,r)
    while(b != 0){
        t = b;
        b = a % b;
        a = t;
    }
    cout << a << '\n';
}