c++

What is printed by the following program segments?

#include

using namespace std;

int func1(int& a, int b);

void main()

{

int num1 = 5;

int num2 = 10;

cout << "func1 returns "

<< func1(num1, num2) << endl;

cout << "num1 = " << num1

<< " num2 = " << num2 << endl;

}

int func1(int& a, int b)

{

int f;

f = a + b;

a++;

b++;

return f;

}