Help with Understanding "#define"

This is a discussion on Help with Understanding "#define" within the C Programming forums, part of the General Programming Boards category; In my book, it says that the syntax for #define is Code: #define macro_name macro_body However, I've seen lots of ...

  1. #1
    Registered User kinghajj's Avatar
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    Help with Understanding "#define"

    In my book, it says that the syntax for #define is
    Code:
    #define macro_name macro_body
    However, I've seen lots of code like this:
    Code:
    #define macro_name
    What does exp. 2 mean?

  2. #2
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    macro

    the working of both r similar.

    1. #define MACR0 10

    what this does is it replaces the word MACRO with 10 everywhere in the programme.
    This is used from the clarity of the programme.

    2. # define MACRO

    here u r just defining a macro
    it acts like an if.

    ex.

    #ifdef MACRO
    printf(....)
    #else
    printf(....)

  3. #3
    Registered User kinghajj's Avatar
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    Oh!

    That makes sense. I can see lots of ways to use that. Thanks.

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