ahhh, noob question.

This is a discussion on ahhh, noob question. within the C Programming forums, part of the General Programming Boards category; I'm using DevC++ and im trying to call a function that is written in another '.c' file that is included ...

  1. #1
    Master n00b Matty_Alan's Avatar
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    Jun 2007
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    Bloody Australia Mate!
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    ahhh, noob question.

    I'm using DevC++ and im trying to call a function that is written in another '.c' file that is included in the project

    umm heres an example of what im trying to do.



    ~MAIN.C~

    Code:
    #include <stdio.h>
    #include "func.c"
    
    int main()
    {
    
        callprint("hello world!");
        
    getchar();  
        return 0;
        
    }//end of main
    ~FUNC.C~

    Code:
    #include <stdio.h>
    
    void callprint(char text[])
    {
    printf(text);               
    }

    it keeps comming up with multi definition of callprint(char text[])

  2. #2
    a_capitalist_story
    Join Date
    Dec 2007
    Posts
    2,655
    You never include .c files, you include .h files.
    func.h:
    Code:
    #ifndef __FUNC_H__
    #define __FUNC_H__
    
    void callprint(char text[]);
    
    #endif
    func.c:
    Code:
    #include <stdio.h>
    
    void callprint(char text[])
    {
        printf(text);               
    }
    main.c:
    Code:
    #include <stdio.h>
    #include "func.h"
    
    int main()
    {
        callprint("hello world!");   
        getchar();  
        return 0;
    }//end of main

  3. #3
    and the hat of int overfl Salem's Avatar
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    The edge of the known universe
    Posts
    32,822
    > it keeps comming up with multi definition of callprint(char text[])
    That's because you #include the source code (that's one copy), and you also compile it as a separate file (that's two).

    Do as rags_to_riches says and create a header file.

    Oh, and
    printf(text);
    is extremely dangerous.
    If you make the mistake of passing a string with formats (like &#37;d), then the call to printf becomes undefined (no extra parameters you see).

    Use fputs() in this instance, or perhaps
    printf("%s",text);
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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