Logical "NON" operator (!)

An expression performs a logical negation.

result = !expression

Parameters

Result

Any variable .

Expression

Any expression .

Description

The following table illustrates how result is determined.

If expression is	then result is
True	False
False	True

All unary operators, such as the ! operator, evaluate the value of an expression according to the following rules:

• If applied to an undefined or null expression, a run-time error is generated.
• object is converted to a string.
• If possible, the string is converted to a numeric value. Otherwise, a run-time error is generated.
• The Boolean value is treated as a numeric value (0 if False, or 1 if true).

The operator is used to produce a numeric value.

For the ! operator, if the expression is Non-zero, result is zero. If expression is zero, then result is 1.

Requirements

Version 1

Please see

~ operator | Operator Precedence | Operator Summary