#include <iostream>
#include "testreference.h"


using namespace std;


int main()
{

  int number{9};
  int number2{5};

   cout << " " <<  endl;
  cout << "Variable \"number\" is: " << number << endl;

  cout << "The function call squareVal(number) gives: " << squareVal(number) << endl;

  cout << "But \"number\" is still: " << number << endl << endl;

  
  cout << "Now run squareRef(number) - it gives no output" << endl;
  squareRef(number);
  
  cout << "However, now variable \"number\" is now: " << number << endl << endl;
  
  cout << "A function passing by reference can still have an output. For example:" << endl;
  
  cout << "Variable \"number2\" is: " << number2 << endl;

  cout << "squareRef2(number2) gives the following output: " << squareRef2(number2) << endl;

  cout << "But beware: variable \"number2\" is now " << number2 << endl << " " << endl;
}


void squareRef(int & num)
{
  num *=num;
}

int squareVal(int num)
{
  return num*num;
}

int squareRef2(int & num)
{
  num *=num;
  return 1234567;
}