Teledyne-lecroy USB Script Decode Manual Manual do Utilizador descarregar pdf (Página 14)

CHAPTER 3

CATC Scripting Language for USB Expressions

x=10

Value_of_x = select {

x<5:"Lessthan 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.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 89 90

Sem comentários

Teledyne-lecroy USB Script Decode Manual Manual do Utilizador Página 14