If (statement) and (statement)

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  1. #1
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    If (statement) and (statement)

    Hi, how to have muilti-conditions on an IF statment?

  2. #2
    End Of Line Hammer's Avatar
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    Code:
    if (a == b && c == d)
    {
     // true
    }
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
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    thanks, this board ROCKS! Im almost done my first c++ program, TIC TAC TOE!

  4. #4
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    hm,, why this dont work
    Code:
    if (playerturn % 2 == 1 && boardarray2[moverow][movecollumn]=false)

  5. #5
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    For the sake of an example, let's deal with expressions with integer values:

    In C, expressions that evaluate to non-zero values are considered "True" when participating in logical operations. Expressions that evaluate to zero are considered "False".

    Here's the example using the && logical operator:

    Code:
    if (first_stuff && second_stuff) {
    
       // This is executed if both are true
    
    }
    
    else {
    
       // This is excuted if neither is true
    
    }
    Here's how it goes: first_stuff is evaluated. If it has a zero value, control passes to the else block. If first_stuff has a non-zero value, second_stuff gets evaluated. If this has a zero value, control passes to the else block. The only way that the first block in this example ever gets executed is whenever both first_stuff and second_stuff are non-zero (true).

    Dave

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    Code:
    if (playerturn % 2 == 1 && boardarray2[moverow][movecollumn]=false)
    = should be ==.

  7. #7
    End Of Line Hammer's Avatar
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    >>boardarray2[moverow][movecollumn]=false)
    How many equals sign are needed to test two variables? Two. One is an assignment, not a comparison.

    [edit]
    Doh! beat.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  8. #8
    Rabite SirCrono6's Avatar
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    But isn't it: if( true )? That means instead of == false you could also do: if( !condition ). ! meaning not, and that being true, the same thing as false. Right?

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  9. #9
    Code Goddess Prelude's Avatar
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    >Right?
    Right (since we are talking about a boolean value). If you were talking about a general test against 0 then I would probably disagree on the grounds that using (!condition) when (condition == 0) would be more sensible results in obscure code. But if the condition being tested really is boolean in nature, (!condition) is usually more clear.
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