c++求 两数 GCD

#include <iostream>using namespace std;int GCD(int num1, int num2){int mod=0;if ((mod = (num1%num2)) !=0){return GCD(num2, mod);}else{return num2;}}int main(){int num1, num2;cout << "enter two integers: ";cin >> num1 >> num2;cout << "number entered: " << num1 << " and " << num2 << endl;cout <<"GCD: " <<  GCD(num1, num2) << endl;system ("pause");return 0;}