Stack and Queue Question

[whathecode]

Hello everyone,

Can anyone help with some advice as to how I can transform this code from Stack to Queue?
Can you guys give me any tips that I can use also in the future?
The code does not need a main part.

  #include "stdafx.h"
#include <iostream>
using namespace std;

class Stack 
{
private:
	int stackArray[5];
	int top;

public:
	Stack()
	{
	top = -1;
	}
	bool empty()
	{
		if(top==-1)
			return 1;
		else 
			return 0;
	}

	int size()
	{
		if(top == 4)
			return 1;
		else
			return 0;
	}
	void push(int n)
	{
		if(!size())
		{
			top++;
			stackArray[top] = n;
		}
		else
		{
			cout<<"Stack has reached the maximum size"<<endl;
		}
	}

	int pop()
	{
		int num;

		if(!empty())
		{
			num = stackArray[top];
			top--;
			return num;
		}
		else
		{
			cout<<"Stack is empty"<<endl;
			return 0;
		}
	}
};