#include <iostream>

using namespace std;

void fun1()
{
	cout << "In fun1" << endl;
}

void fun2(int x, int y)
{
	cout << "In fun2" << endl;
	cout << "x = " << x << endl;
	cout << "y = " << y << endl;
}

int fun3()
{
	cout << "In fun3" << endl;
	return 3;
}

void fun4(void (*pExample)())
{
	pExample();
}

void main()
{
	//a function name is just an address
	cout << "fun1 is at address " << fun1 << endl;
	cout << "fun2 is at address " << fun2 << endl;
	cout << "fun3 is at address " << fun3 << endl;
	cout << endl;

	void (*pExample1)();
	pExample1 = fun1;
	cout << "pExample1 now points to address " << pExample1 << endl;
	pExample1();
	cout << endl;

	void (*pExample2)(int,int);
	pExample2 = fun2;
	cout << "pExample2 now points to address " << pExample1 << endl;
	pExample2(1,2);
	cout << endl;

	int (*pExample3)();
	pExample3 = fun3;
	cout << "pExample3 now points to address " << pExample1 << endl;
	cout << pExample3() << endl;
	cout << endl;

	fun4(fun1);

}