class phanso
{
private:
	int tu;
	int mau;
public:
	int ktra()
	{
		if (tu > 0 && mau > 0) // dương
			return 1;
		else if (tu < 0 && mau < 0) // dương
			return 1;
		else if (tu < 0 && mau >0) // âm
			return 2;
		else if (tu > 0 && mau < 0) // âm
			return 2;
		else if (tu == 0 && mau != 0) // =0
			return 0;
		else if (mau == 0)
			return 3;
	}

	void nhap()
	{
		cout << "NHAP VAO PHAN SO: " << endl;
		cout << "NHAP VAO TU SO:= ";
		cin>> tu;
		cout << "NHAP VAO MAU SO: ";
		cin>> mau;
	}
	void xuat()
	{
		if (ktra() == 3)
		{
			cout << "KHONG TON AI PHAN SO!" << endl;
			goto kthuc;
		}
		cout << "PHAN SO BAN VUA NHAP LA: " << tu << "/" << mau << endl;
		if (ktra() == 1)
			cout << "DAY LA PHAN SO DUONG!" << endl;
		if (ktra() == 2)
			cout << "DAY LA PHAN SO AM!" << endl;
		if (ktra() == 0)
			cout << "DAY LA PHAN SO = 0 !" << endl;
	kthuc:
		system("exit");
	}
};
int main()
{
phanso a;
			  a.nhap();
			  a.ktra();
			  a.xuat();
system("pause");
}