Please explain this piece of code: box.vector.x * ((i & 1) != 0 ? -1 : 1)

Hi all

I know what the piece of code does, and why it does it what I am really after is what:

((i & 1) != 0 ? -1 : 1)

is all about. I know it's a short hand conditional statement, but I'm really not sure at all what it does, or how it should really be used. Any help ay all would be greatly appreciated.

Cheers
directxBOBAsked:
Who is Participating?
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
the expressions ((i & 1) != 0 ? -1 : 1
follows the following syntax:
<boolean condition>? <true_result> : <false_result>

if you know access:
iif(((i & 1) != 0 , -1 , 1)

i & 1   -> this returns the bitwise and operation between i and 1.
in practice, this means: check if the last bit is set to 1 or 0.
in english: is i odd or even.

hence, the expression means: return -1 if i is odd, return 1 if i is even
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