See Also

Description

Used to perform logical negation on an expression.

Syntax

result = !expression

The ! operator syntax has these parts:

Part Description

result Any variable.

expression Any expression.

Remarks

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 expressions as follows:

• If applied to undefined or null expressions, a run-time error is raised.
• Objects are converted to strings.
• Strings are converted to numbers if possible. If not, a run-time error is raised.
• Boolean values are treated as numbers (0 if false, 1 if true).

The operator is applied to the resulting number.

For the ! operator, if expression is nonzero, result is zero. If expression is zero, result is 1.

© 1997 by Microsoft Corporation. All rights reserved.

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