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@if...@elif...@else...@end Statement

Visual Studio 2010

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

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@if (
   condition1
)
   text1
[@elif (
   condition2
)
   text2]
[@else
   text3]
@end

condition1, condition2

Required. An expression that can be coerced into a Boolean expression.

text1

Optional. Text to be parsed if condition1 is true.

text2

Optional. Text to be parsed if condition1 is false and condition2 is true.

text3

Optional. Text to be parsed if both condition1 and condition2 are false.

When you write an @if statement, you do not have to place each clause on a separate line. You can use multiple @elif clauses. However, all @elif clauses must come before an @else clause.

You commonly use the @if statement to determine which text among several options should be used for text output.

The following command-line program illustrates the use of the @if...@elif…@else...@end statement.

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@cc_on

print("JScript version: " + @_jscript_version);

@if (@_win32)
    print("Running on a 32-bit version of Windows");
@elif (@_win16)
    print("Running on a 16-bit version of Windows");
@else
    print("Running on a different operating system");
@end
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