Whats best way to loop a program?

I have a simple little program that I created to test a funtion that best goes back to the beginning of the code from the end. Any ideas?

Heres just a simple program:

Code:

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

int ReadNumber()
{
    using namespace std;
    cout <<" Welcome to Jake's Calculator, enter in two numbers to be computed" << endl;
    cout <<" Answers will be shown in this form: Add, Subtract, Multiply, and Divide." << endl;
    cout <<" Enter numbers to calculate:" << endl;
    int x;
    cin >> x;
    return x;
}
void WriteAnswer(int x)
{
    using namespace std;
    cout <<"The answer is " << x << endl;
}
int main()
{
    int x = ReadNumber();
    int y = ReadNumber();
    WriteAnswer(x+y);
    WriteAnswer(x-y);
    WriteAnswer(x*y);
    WriteAnswer(x/y);
    system("pause") // What to do from here to loop to top?
    return 0;
}

look into do-while or just while loops. google and this site's tutorials are an excellent source of information.