OR statement in C

This is a discussion on OR statement in C within the C Programming forums, part of the General Programming Boards category; Hi, Is there such a thing as an OR statement in C? For example: If (x>0 OR x<10) then..... Thanks!...

  1. #1
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    OR statement in C

    Hi,

    Is there such a thing as an OR statement in C?

    For example:

    If (x>0 OR x<10)
    then.....

    Thanks!

  2. #2
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    Yes, replace the OR with || (AND is && in C)

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    Thank you!

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    No problem, I'll bill you later.

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    Keylac, I assume you are a beginner (so am I). Pay attention to the double symbols: && and ||

    You also have the single | and &, which are the bitwise operators for or and and.

    You'll remember from boolean logics:

    0 | 1 = 1
    1 | 0 = 1
    1 | 1 = 1
    0 | 0 = 0

    0 & 1 = 0
    1 & 0 = 0
    1 & 1 = 1
    0 & 0 = 0

    It's an often made beginner's mistake to confuse these operators (logical and bitwise), it 's comparable to

    if (x = 0)

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    another thing ....

    x=6 is often mistaken with x ==6.

    x = 6 means, make x equal 6.

    x == 6 means, "Is x equal to 6?"

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    Quote Originally Posted by x2x3i5x View Post
    another thing ....

    x=6 is often mistaken with x ==6.

    x = 6 means, make x equal 6.

    x == 6 means, "Is x equal to 6?"
    I totally agree with this point, and this is a very good point to mention where most beginner does the mistake. in condition or loop people say something like x=6 means it will, always be true.

    so to reduce what we can do just

    do like this

    Code:
    if (6 ==x)
    Then when ever by mistake we do like

    Code:
    if (6 =x)
    it means the compiler will say than
    error: lvalue required as left operand of assignment
    In my point of view we can do like this also

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    Thanks!

    Thanks everyone for the great info!

  9. #9
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    Okay, now that you got the important, here's some fun trivia:

    If your compiler supports the 1999 edition of the C standard sufficiently, you can #include <iso646.h> and use the or macro instead of ||. (<iso646.h> defines or to be || for you.) That said, there is probably no benefit for you in doing this.
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