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Header files

Posted by PavalDaniel [send private reply] at March 03, 2002, 01:09:48 PM

Does anyone know how to write a simple header file?
Is it enough to write:

printf("This is a program");

in a *.h file so that if you include it, the text is displyed on the screen when you run the program?

Posted by Psion [send private reply] at March 03, 2002, 01:12:30 PM

When you #include something, the text is just inserted as is. A "header file" is only valid when you insert it someplace where it would be valid if you just copied and pasted it there.

Posted by metamorphic [send private reply] at March 03, 2002, 02:00:13 PM

Also header files are most commonly used to hold function prototypes and class definitions. Normally code that preforms a task (as opposed to code that tells the compiler what a class or function does) such as your code above, would be placed in another .c or .cpp file and added to a project.

Posted by Mycroft [send private reply] at March 05, 2002, 06:57:42 PM

a header file includes preprocesser directives so basically every has the # in front of it. The most basic header would be to put all the #include <*.h> file you use in your program:

#include <stdio.h>
#include <windows.h>

Then you save it with a .h extension. Now instead of puting in all those includes in the .c or .cpp file just use your header.

I recommend you got to a place like www.gametutorials.com, they got a lot of basic information on using the #define, #if, ect. preprocessor statements. Headers are really cool you could basically write an entire program in it.

Posted by CodeRed [send private reply] at March 13, 2002, 11:39:37 AM

Umm... you can do that I guess... but the most common use is for function prototypes and class definitions, like metamorphic said.

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