The AND Boolean operator
The AND Boolean operator in Envision Basic, just like any other programming language, combines a set of expressions.
So, if both expressions are false, then the combined expression is false too.
In other words, both expressions needs to be true for the combined expressions to be true.
Syntax
expression1 AND expression2
expression1 & expression2
Example
X = 1 ; Y = 2 ; Z = 3
IF (X < Y) AND (Y < Z) THEN REPROMPT
END
The OR Boolean operator
The OR Boolean operator in Envision Basic, combines a set of expressions.
So, if both expressions are false, then and then the combined expression is false.
In other words, any one expression needs to be true in order for the combined expressions to be true.
Syntax
expression1 OR expression2
expression1 ! expression2
Example
X = 1 ; Y = 2 ; z = 3
IF (X < Y) OR (Y < Z) THEN GOSUB RETRY:
The NOT Boolean operator
The NOT Boolean operator in Envision Basic reverses the logical result of the argument expression.
If the expression is true, the function returns false (0).
If the expression is not true, the function returns true (1).
Syntax
NOT(expr)
Example
The condition won't be satisfied and THEN statement will be executed.
X = 1 ; Y = 2
IF NOT(X > Y) THEN GOSUB RETRY:
AND examples functions NOT OR syntax
