QBasic 1.1 Commands List: Boolean Operators

Syntax
result = expression1 boolean-operator expression2
Description / Parameter(s)
boolean-operator Any of the following Boolean operators:
 
NOTBit-wise complement
ANDConjunction
ORDisjunction (inclusive "or")
XORExclusive "or"
EQVEquivalence
IMPImplication
Each operator returns results as indicated in the following truth table. T is true (nonzero); F is false (zero):
 
Expression1 Expression2 NOT AND OR XOR EQV IMP
T T F T T F T T
T F F F T T F F
F T T F T T F T
F F T F F F T T
Boolean operations are performed after arithmetic and relational operations in order of precedence.
Expressions are converted to integers or long integers before a Boolean operation is performed.
If the expressions evaluate to 0 or -1, a Boolean operation returns 0 or -1 as the result. Because Boolean operators do bit-wise calculations, using values other than 0 for false and -1 for true may produce unexpected results.