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Message: [QUOTE="Stephen Sprunk, post: 3783506"] [i] To understand this, you must remember that, in C, things that look boolean are actually ints in disguise. In particular, the result of a comparison operator (e.g. <= or ==) is an int: 0 for false and 1 for true. You can do anything with these ints that you can any other int, like feed them into another comparison operator, add and subtract them, etc. This particular test checks that the primary conditions have the same result; the overall condition is true (1) if they are, false (0) if they're not. It might be easier to understand with an example of how the code might end up being evaluated: if ( (SomeFunc(Item[i], Col) <= Limit) == (V == 1) ) if ( (SomeFunc(1,2) <= 2.0) == (2 == 1) ) if ( (1.0 <= 2.0) == (0) ) if ( 1 == 0 ) if ( 0 ) S[/i][/i] [/QUOTE]