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

void factorial();

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

//Output the product 1 * 2 * 3 * 4
//This product is called the "factorial of 4".

void factorial()
{
	int f {1};  //Can mention this variable only within the {} of factorial.

	for (int i {1}; i <= 4; ++i) {
		f *= i;   //means f = f * i;
	}

	//Old news: the i has already been destroyed by the time we arrive here.

	cout << "The factorial of 4 is " << f << ".\n";
}	//New news: the f in factorial is destroyed at this curly brace.