#include<iostream>
#include<iomanip>
#include<math.h>
#include<time.h>
using namespace std;

//function prototypes
void fun1(int i);
void fun2(int& i);
void doStuff();
int three();

void main()
{
	int x = 9;
	fun1(3);
	fun2(x);
	doStuff();
	//cout << three() << endl;
}

//implementation of prototypes
void fun1(int i)
{
}

void fun2(int& i)
{
}

void doStuff()
{
}

int three()
{
	return 3;
}