Control Commands > If...Then...Else Statement

Description

Conditionally executes a group of statements, depending on the value of an expression.

Syntax

If condition Then statements [Else elsestatements ]

Or, you can use the block form syntax:

If condition Then
[statements]
[ElseIf condition-n Then
[elseifstatements]] . . .
[Else
[elsestatements]]
Endif

The If...Then...Else statement syntax has these parts:

Part	Description
condition	One or more of the following two types of expressions: A numeric or string expression that evaluates to True or False. If condition is Null, condition is treated as False.
statements	One or more statements separated by colons; executed if condition is True.
condition-n	Same as condition.
elseifstatements	One or more statements executed if the associated condition-n is True.
elsestatements	One or more statements executed if no previous condition or condition-n expression is True.

Remarks

You can use the single-line form (first syntax) for short, simple tests. However, the block form (second syntax) provides more structure and flexibility than the single-line form and is usually easier to read, maintain, and debug.