#include #include using namespace std; int gcd(int x, int y){ x = abs(x); y = abs(y); if(y == 0) return x; if(y > 0) return gcd(y, x % y); return 0; } int main(){ cout << gcd(20 ,30) << endl; cout << gcd(112, 42) << endl; cout << gcd(-112,42) << endl; return 0; }