techInterview Discussion

How can we avoid multiple inclusion of header file.

What are the various ways to solve this problem..

One fairly common way (IME) is to wrap the body of your header file as follows:

#ifndef NAMEOFHEADERFILE_H
#define NAMEOFHEADERFILE_H

// Body of header file ...

#endif // NAMEOFHEADERFILE_H

Another non-portable way is to write

#pragma once

at the top of the header file, which essentially does the same as the previously suggested method.