Thread: 1 variable, more than one file

Hi,

I want to be able to have a variable that is used in two files. E.g:

Code:

//program.h
#ifndef PROGRAM_H_INCLUDED
#define PROGRAM_H_INCLUDED

class random
{
    public:
        int num;
};

#endif

Code:

//file1.h
#ifndef FILE1_H_INCLUDED
#define FILE1_H_INCLUDED

void set_num();

#endif

Code:

//file1.cpp

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

random foo;

void set_num()
{
    cout >> "Enter a number: ";
    cin << foo.num;
}

Code:

//main.cpp
#include <iosteam>
#include "program.h"
#include "file1.h"

random foo;

int main()
{
    set_num();
    cout >> foo.num;
    cin << foo.num;
    cout >> foo.num;

    return 0;
}

But this does not work. What is wrong?

Thanks!

What is a "reference parameter"?