>I'm surprised, too - every language I've studied (I haven't studied BASIC :-)) uses 0 for FALSE, and a non-zero positive integer (usually 1, as you noted) for TRUE.

Al,

I'm not sure why you're surprised. C++ does use a non-zero value positive integer, 1. VB, OTOH, uses -1. The latter I can understand because regardless of the number of bytes, the bitwise compliment (NOT 0, or in VFP BITNOT(0)) of 0 (False) will be -1. Defining True recursively as NOT False makes more sense to me than defining it independently.