My own header files
Hi!
My question is how to make my own header files? I' m writing a program and I want that every function will be in his own .c file. Something like this:
main.c
main.h
about.c
about.h
...
I was trying something but I always get a lot of errors.
Please help.
Current projects:
1) User Interface Development Kit (C++)
2) HTML SDK (C++)
3) Classes (C++)
4) INI Editor (Delphi)
Don't know if you have tried this already >
Create the header file, say example.h, using
#ifndef EXAMPLE_H
#define EXAMPLE_H
at the beginning
and
#endif
at the end
call the header file then from your main file using
#include "example.h"
Your main.c file has to include all the headers of the functions you are trying to use.
1 rule of the Samurai Code: if you have nothing to say, don't say anything at all!
> I was trying something but I always get a lot of errors
Yeah, posting them would have been a big help
Unless you want another 20 messages guessing...
create afile main.h
write there your function
then create your main.c
write there your program
and at the top write
#include "main.h"
My main.c file:
main.h file:Code:# include "main.h" int main() { // few functions and they are defined in main.h }
about.c file:Code:# include <windows.h> # include <stdio.h> # include <conio.h> # include <string.h> # define LEFT_CTRL 40 # define LEFT_ALT 34 # define RIGHT_ALT 33 # define RIGHT_CTRL 36 void clrscr (void); void clrscr () { system ("CLS"); }
about.h file:Code:# include "main.h" # include "about.h" void About () { // code }
These are my 4 files. I get an error that function clrscr () is already defined in main.obj.Code:void About (void);
Current projects:
1) User Interface Development Kit (C++)
2) HTML SDK (C++)
3) Classes (C++)
4) INI Editor (Delphi)
Move this to main.cCode:void clrscr () { system ("CLS"); }
Is there no way to have a clrscr in a main.h file? And for the # define I too get errors that they are already defined in main.obj file. Should I moved them too into main.c file?
Current projects:
1) User Interface Development Kit (C++)
2) HTML SDK (C++)
3) Classes (C++)
4) INI Editor (Delphi)
void clrscr (void);
This in the .h file
void clrscr ()
{
system ("CLS");
}
This in the .c file
Declarations (#defines, prototypes etc) go in .h files
Definitions go in .c files
You managed it with your about function.
All .h files should begin with
#ifndef FILE_INCLUDED
#define FILE_INCLUDED
And end with
#endif
Eg
This protects you from including the same .h file several timesCode:#ifndef MAIN_H #define MAIN_H # include <windows.h> # include <stdio.h> # include <conio.h> # include <string.h> # define LEFT_CTRL 40 # define LEFT_ALT 34 # define RIGHT_ALT 33 # define RIGHT_CTRL 36 void clrscr (void); #endif MAIN_H
One more question. What about constants (const int x = 5?
Current projects:
1) User Interface Development Kit (C++)
2) HTML SDK (C++)
3) Classes (C++)
4) INI Editor (Delphi)
extern const int x;
Would go in a .h file
const int x = 5;
would go in a .c file
Is there anything else that I should know about the header files?
Current projects:
1) User Interface Development Kit (C++)
2) HTML SDK (C++)
3) Classes (C++)
4) INI Editor (Delphi)
