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CATC SCRIPTING LANGUAGE 1.0 CHAPTER 3

Reference Manual Expressions

x = 10

Value_of_x = select {

x < 5 : "Less than 5";

x >= 5 : "Greater than or equal to 5";

};

The above expression will evaluate to “Greater than or equal to 5” because the first

true expression is x >= 5. Note that a semicolon is required at the end of a

select expression because it is not a compound statement and can be used in an

expression context.

There is also a keyword default, which in effect always evaluates to true. An

example of its use is

Astring = select {

A == 1 : "one";

A == 2 : "two";

A == 3: "three";

A > 3 : "overflow";

default : null;

};

If none of the first four expressions evaluates to true, then default will be eval-

uated, returning a value of null for the entire expression.

select expressions can also be used to conditionally execute statements, similar

to C switch statements:

select {

A == 1 : DoSomething();

A == 2 : DoSomethingElse();

default: DoNothing();

};

In this case the appropriate function is called depending on the value of A, but the

evaluated result of the select expression is ignored.

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