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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Aug 20, 1997

Tips on Using Boolean Logic

Programmer's of all skill levels often make errors when using Boolean logic. 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 will return False (0) or <> False (some value). Always phrase your evaluations in a TRUE, FALSE, or <> ZERO (<> ZERO in this case means "has value" as opposed to NOT FALSE which means TRUE (-1)). Not only will your logical intention be better understood, you'll be less likely to experience a logic fault that would be a bear to track down.
MicroHelp Tech
 
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