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

void f(int a, int& b, int *p);   //function declaration

int main()
{
	int i {10};
	int j {20};
	int k {30};

	f(i, j, &k);   //The function has the ability to change j and k.

	cout << "i = " << i << "\n";   //unchanged
	cout << "j = " << j << "\n";   //changed
	cout << "k = " << k << "\n";   //changed

	return EXIT_SUCCESS;
}

void f(int a, int& b, int *p)   //function definition
{
	cout << "f received " << a << ", " << b << ", " << *p << ".\n";
	++a;   //Has no effect on i.
	++b;   //does have an effect on j
	    
	//++p; //Bad: you can only increment a pointer to an array element
	++*p;  //has an effect on k.  We're incrementing what p points to.
}