Modular Programming

This is a discussion on Modular Programming within the C Programming forums, part of the General Programming Boards category; hi all take a look at this codes Code: /*source.c*/ #include<stdio.h> #include "file.h" main() { char *name="strom man\n"; sy_hay(name); } ...

  1. #1
    life is a nightmare
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    Modular Programming

    hi all
    take a look at this codes
    Code:
    /*source.c*/
    #include<stdio.h>
    #include "file.h"
    main()
    {
          char *name="strom man\n";
          sy_hay(name);
          }
    Code:
    /*file.c*/
    #include "file.h"
    void say_hay(char *string)
    {
         printf("Hy %s",string);
         }
    Code:
    /*file.h*/
    void say_hay(char *string);
    i get this
    Code:
      Circular ss <- ss.o dependency dropped.
    ? i don't get it ? why is that?

  2. #2
    Fear the Reaper...
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    Why are you including file.h in file.c ?
    Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction

  3. #3
    ZuK
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    It gives me a linker error
    Code:
    /*source.c*/
    #include<stdio.h>
    #include "file.h"
    main()
    {
          char *name="strom man\n";
          sy_hay(name);  // shouldn't it be say_hay(name);
    }
    but hen what is ss and ss.o ?

    BTW including file.h in file.c is ok but not necessary in this case.

    Kurt

  4. #4
    Woof, woof! zacs7's Avatar
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    file.h has already been included by "source.c", but it's been included again by "file.c"

    You need some 'inclusion guards'

    ie in file.h

    Code:
    #ifndef INCLUDED_FILE_H
    #define INCLUDED_FILE_H
    
    extern void say_hay(char * string);
    
    #endif /* INCLUDED_FILE_H */

  5. #5
    ZuK
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    Quote Originally Posted by zacs7 View Post
    You need some 'inclusion guards'
    They are always a good idea but not "needed" in this case.

    We have two compilation units in this case. each includes file.h only once -> no problem.
    'inclusion guards' protect against multiple inclusions in the same compilation unit only.
    Kurt

  6. #6
    Woof, woof! zacs7's Avatar
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    Sorry, it's become a habit for me to use them everywhere

    Just incase it is included more than once

  7. #7
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    Willie Mays won't like it unless "say_hay" is spelled the same in all three files.

    Edit:

    I was suggesting that the spelling might be the cause of errors in your program, of course.
    Last edited by Adak; 05-10-2007 at 06:10 AM.

  8. #8
    life is a nightmare
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    sorry about the spelling
    and thanks for the advices
    i will be back

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