#include <iostream>
using namespace std;

double average (int & a, int b)
{
	double ave;
	cout << "beginning of function average: a = " << a << ", b = " << b << endl;
	a = a + b;
	ave = a / 2.0;
	cout << "end of function average: a = " << a << ", b = " << b << endl;
	return ave;
}

int main()
{
	int num1, num2;

	cout << "Enter two integers: ";
	cin >> num1 >> num2;
	cout << "in main before calling average: num1 = " << num1 << ", num2 = " << num2 << endl;
	cout << "average is " << average(num1, num2) << endl;
    cout << "in main after calling average: num1 = " << num1 << ", num2 = " << num2 << endl;

	return 0;
}