how to create header files in c/c++

[bhandarisourabh]

hi, i m sourabh....... Can any1 tell me how to create a header file in c/c++

[JosAH]

Simply create a text file with the extension .h and voila.

kind regards,

Jos

[weaknessforcats]

The text file doesn't even need the .h you just need to #include the text file in your source file.

[Tassos Souris]

Exactly what the above guys said...

A typical example of a header file named Example.h is:

#ifndef EXAMPLE_H
#define EXAMPLE_H
 
/* make definitions, declarations here... */
 
#endif /* EXAMPLE_H */
 

Note that if you want to be strictly ANSI the above code is wrong!!! Visual Studio gives an error and gcc a warning. And the reason is the last comment...

[weaknessforcats]

Note that if you want to be strictly ANSI the above code is wrong!!! Visual Studio gives an error and gcc a warning. And the reason is the last comment...

I'll bite. My Visual Studio sees no error.

[Tassos Souris]

I'll bite. My Visual Studio sees no error.

Visual Studio gives an error as i said only with ANSI. You must put the /Za flag.

Specifically, the error is:

fatal error C1004: unexpected end-of-file found
 

and that is because the logical source does not end with a new-line.. something like that..

[weaknessforcats]

Yes, the file must end with a null record. That is, enter-key only.
I don't know exactly what the ANSI standard says about this.

[dumparun]

thats interesting to know..
thanks ...

[JosAH]

Yes, the file must end with a null record. That is, enter-key only.
I don't know exactly what the ANSI standard says about this.

The C99 Standard:

5.1.1.2. Environment

A source file that is not empty
shall end in a new-line character, which shall not be
immediately preceded by a backslash character before
any such splicing takes place.

By 'splicing' they mean the trailing backslash immediately followed by a new-line
character which concatenates two physical lines.

kind regards,

Jos

[Tassos Souris]

I actually thought this was a bug in Visual Studio 2008 and asked a friend to send a bug report; the answer we got amazed us!!! :-P

[Banfa]

I worked on a multi-platform project once where a new platform was introduced and its compiler produced an error where source files did not end in new-line. The compilers on the 3 existing platforms did not produce an error or even a warning in this case so lots of the code files did not end in a new-line.

Some lucky person (not me) got the job of adding a new-line to the end of all the (several 100) source files.