Tips on Using Boolean Logic

Programmer’s of all skill levels often make errors when using Booleanlogic. This statement might not evaluate the way you think it should:

 IF (SomeNumber AND 16) OR _ (SomeOtherNumber <> 0) THEN... 

The (SomeNumber AND 16) will never return a True (-1). It willreturn False (0) or <> False (some value). Always phrase your evaluationsin a TRUE, FALSE, or <> ZERO (<> ZERO in this case means “hasvalue” as opposed to NOT FALSE which means TRUE (-1)). Not only willyour logical intention be better understood, you’ll be less likely to experiencea logic fault that would be a bear to track down.

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