ORe identifier: #ifndef ID_1 || ID_2 || ....

This is a discussion on ORe identifier: #ifndef ID_1 || ID_2 || .... within the C Programming forums, part of the General Programming Boards category; Is it possible to ORe some identifiers with #ifdef or #ifndef? This does not work: #ifndef ID_1 || ID_2 || ...

  1. #1
    Registered User
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    ORe identifier: #ifndef ID_1 || ID_2 || ....

    Is it possible to ORe some identifiers with #ifdef or #ifndef?
    This does not work:
    #ifndef ID_1 || ID_2 || ....

  2. #2
    Just Lurking Dave_Sinkula's Avatar
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    Code:
    #if !(defined ID_1 || defined ID_2)
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
    Registered User
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    Thx for your help. But it just works this way:
    Code:
    #if (!defined ID_1 || !defined ID_2)
    mfg

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