Diff between Header file and Module

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  1. #1
    john212
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    Diff between Header file and Module

    What is the difference between a header file and a module?
    Are both always necessary?

  2. #2
    Confused Magos's Avatar
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    A header file contains declarations only. A module (if you refer to the separately compiled c file) contains the actual data.
    The header file tells the other parts of the program what is in the module since they don't know until the linking occurs.
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  3. #3
    john212
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    so are both always necessary?

  4. #4
    Registered User Pioneer's Avatar
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    Modules are the ones that do the work, header files are the ones that give you access to the modules, so you need both.

  5. #5
    Banned master5001's Avatar
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    >> so are both always necessary?

    You use the word always so I'm going to assume you mean always. The answer is this, you only need a header when you use a function that is in the actual module. Even if you compile a library (or whatever form of module you are refering to) or something into your program!

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