header file

This is a discussion on header file within the C Programming forums, part of the General Programming Boards category; Actually this Q was discussed b4...sorry to ask it again. In coding a Linked-list program, it is better to code ...

  1. #1
    FCF
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    header file

    Actually this Q was discussed b4...sorry to ask it again.

    In coding a Linked-list program, it is better to code the linked-list's header file first(I did it by refering the note distributed from my lecture). Eg:
    Code:
    /* begin ListInterface.h */
    ...
    typedef struct nodeTag{
    int data;
    struct nodeTag *next;
    }NODE_TYPE;
    ...
    /* not details caz just example */
    /* end ListInterface.h */
    Then, i code the ListImplementation.cpp file which contains all the functions related to the operation in linked-list like insert, delete, search... and first Q1 comes: Why i have to includes the #include "ListInterface.h" in this ListImplementation.cpp?
    Furthermore, when i procede, and code the main program, i must #include "ListInterface.h" also. Then, i code the rest until finish and compile. The result was: ERROR: Function need to be resolved.(the function in ListImplementation.cpp). I don't understand this, but i replaced the #include "ListInterface.h" with the #include "ListImplementation.cpp" and it works!!! No more errors and the program run. Why?

  2. #2
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    Looks to me like you have the function in the .c file, not in the .h

    If you want it in the .h file, try using 'extern' before the functions

    I don't really understand what you are trying to say, but from what I gather this looks like the problem. If it compiles without including the .h file, it isn't needed, so try taking a look at the .cpp file and then transferring certain things over to the .h or make it all in the .c

    Which I suppose takes me to the first question, you only need to #include a file if you want to use structures, void's, int's, etc, in more than one .c file. Also it makes it look neater if you use header files, because some things just look like they belong there, not in .c files, even though they may work But the answer is you don't _HAVE_ to #include anything.

    Hope this answers something, heh
    - Daniel Wallace

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    FCF
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    Looks to me like you have the function in the .c file, not in the .h
    Thank u for trying to help.
    I code the functions related to linked-list operations in the ListImplementation.cpp. And, when #include "ListInterface.h" in main, it can't be compiled. Actually wat is the meaning of function need to be resolved? After all, i will try to add the extern key word in the functions in the ListImplementation.cpp.

  4. #4
    ~- Y u n a -~ beely's Avatar
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    hey FCF, did you copy your header file on the debug folder??
    if no, then that's a problem that can exe your header file.

  5. #5
    FCF
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    Wat do u mean???

  6. #6
    ~- Y u n a -~ beely's Avatar
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    ermm, when you build your source code, it'll store on the "DEBUG" folder. right ? then, i guess you should have to try to copy the header file on the debug folder la ..

  7. #7
    FCF
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    i will try. Thank u your help.

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