Problem with boolean operators

This is a discussion on Problem with boolean operators within the C Programming forums, part of the General Programming Boards category; Hello. I have a problem with the boolean operators. On the end of the second part of the C beginner ...

  1. #1
    Registered User
    Join Date
    Sep 2009

    Problem with boolean operators


    I have a problem with the boolean operators.
    On the end of the second part of the C beginner tutorial I was going to quiz.
    I was ready for the answers of the quiz but I had it wrong!
    This Code:
    !(1 && !(0 || 1)).
    Seems to be true and I tought it was false.
    But I dont really get it.
    The AND goes before OR but the OR is between two paranthesis so it goes first.
    Before the paranthesis is an NOT sign but does 0 evaluate to 1 or does 1 evaluate to 0. I see a NOT sign but I dont know wich evaluates the first number immideatly afther the NOT thing? or another?
    I need to know that first otherwise I dont get the whole C program and I get stuck.


  2. #2
    DESTINY BEN10's Avatar
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    Jul 2008
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    The steps are as follows
    1. 0||1 = 1
    2. !1 = 0
    3. 1&&0=0
    4. !0 =1

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  3. #3
    "I Win!" by U. Lose vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    a = 0 || 1; because of parentthesis
    b = !a; because of preferencies

    c = 1 && b; because of parenthesis

    d = !c;
    To be or not to be == true

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