VTech PreComputer 2000 Manual page 45

LOGICAL OPERATORS
Logical operators are used IF .. . THEN ... ELSE and such statements where a
condition is used to determine subsequent operations within the user program. The
logical operators are: AND,OR,NOT.
For purposes of this discussion, A and B are relational expressions having only
TRUE and FALSE. Logical operations are performed after arithmetical and
relational operations.
Operator Example Meaning
Not
Not A If A is true, Not A is false.
AND
A AND B A AND B has the value true, only if A and
B are both true.
A AND B has the value false if either A or
B is false.
OR A ORB A OR B has the value true if either A or
B or both are true .
It has the value false if both are false .
TRUTH TABLES
The following tables are called TRUTH TABLES. They illustrate the results of the
previous logical operations with both A and B given for every possible combination
of values.
TRUTH TABLE FOR "NOT" FUNCTION
A NOT A
T F
F T
TRUTH TABLE FOR "AND" FUNCTION
A B A AND B
T T T
T F F
F T F
F F F
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