Thread: Program with boolean function

  1. #1
    Registered User
    Join Date
    Feb 2008

    Program with boolean function

    anyone teach me about boolean function in C program... give me any one example program

  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    What do you want to understand?

    C doesn't have a "boolean type", so I presume you are referring to boolean operators, which would be the:
    && operator
    || operator
    ! operator.

    Some or all of those are likely to appear in any application of some complexity, e.g. anything a bit more complex than "Hello World" [actually they are probably part of that too, as I expect printf() to use them - but you can't see that in usual builds].

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    Registered User
    Join Date
    Feb 2008
    maybe you mean the type "_Bool" and "bool"?

    _Bool can only have value 0 and 1. 0 = neg and 1 = positive.

    bool needs you include the <stdbool.h> and a variable of type bool can have the value "true" and "false".
    But just use _Bool and don't include anything.

    I have no idea if it's optional or is C standard. But that worked with all compilers I used. (all recent)

    Just checked the pdf linked in the pinned thread and apparently both _Bool and bool are C standard.
    Last edited by 2112; 02-18-2008 at 10:53 AM.

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