Re: Problem with include header file

chat wrote:

I have 3 files like this:
--------------------------------------------------------
file name : header.h

#ifndef TEST_H
#define TEST_H
int a=1;
double b=0.5;
void fn1();
#endif
---------------------------------------------------------
file name : file1.cpp

#include<iostream>
#include "header.h"
using namespace std;
void fn1()
{
cout<<a;
}
.... snip ...

What is the mistake? Why are variable a,b multiple defined since
I use compiler directive to assure the multiple include header file?

You have two fundamental problems. First you are declaring data
objects in header files, which is a no-no. Second, you are using
C++, which is off-topic here. We deal with C.

The purpose of headers is to export connections to another source
file.

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