#include <iostream>
#include <cstdlib>
using namespace std;

void f();

int main()
{
	f();
	f();
	f();
	return EXIT_SUCCESS;
}

//Count how many times this function has been called so far.

void f()
{
	static int i {0}; //Put 0 into i only the first time function is called.
	++i;
	cout << "This is call number " << i << " to the function.\n";
}