#include <iostream.h>


int main()
{
	void zeroSmaller (int&, int&);
	int n1=2, n2=4;
	int n3=3, n4=5;
	char nans;

	zeroSmaller(n1, n2);
	zeroSmaller(n3, n4);

	cout << "Do you want to enter the numbers? (y/n) ";
	cin >>  nans;
	
	if (nans == 'y')
	{
	cout << "\nGroup1:" << endl;
	cout << "Enter no.1: ";
	cin >> n1;
	cout << "Enter no.2: ";
	cin >> n2;
	zeroSmaller(n1, n2);
	cout << "no1 = " << n1 << " - no2 = " << n2 << endl;
	cout << "\nGroup2:" << endl;
	cout << "Enter no.1: ";
	cin >> n3;
	cout << "Enter no.2: ";
	cin >> n4;
	zeroSmaller(n3, n4);
	cout << "no1 = " << n3 << " - no2 = " << n4 << '\n' << endl;
	return 0;
	}
	else
	cout << "n1 = " << n1 << " - n2 = " << n2 << endl;
	cout << "n3 = " << n3 << " - n4 = " << n4 << endl;
	return 0;
}

void zeroSmaller (int& no1, int& no2)
{
	if (no1 < no2)
		no1=0;
	else
		no2=0;
}