Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Uživatelský manuál stáhnout pdf (Strana 30)

Chapter 7: Statements File-based Decoding User Manual

24 LeCroy Corporation

7.6 return Statements

Every function returns a value, which is usually designated in a return statement. A

return statement returns the value of an expression to the calling environment. It uses

the following form:

return <expression>;

An example of a return statement and its calling environment is

str = FormatEx ( "%s", HiThere() );

...

HiThere()

{

return "Hi there";

}

The call to the function FormatEx causes the function HiThere() to be executed.

HiThere() returns the string “Hi there” as its value. This value is passed to the calling

environment (

FormatEx), causing “Hi there” to be assigned to str.

A return statement also causes a function to stop executing. Any statements that come

after the

return statement are ignored, because return transfers control of the

program back to the calling environment. As a result,

str = FormatEx ( "%s", HiThere() );

...

HiThere()

{

a = "Hi there";

return a;

b = "Goodbye";

return b;

}

results in only “Hi there” getting assigned to str. Because when return a; is

encountered, execution of the function terminates, and the second return statement

(

return b;) is never processed.

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Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Uživatelský manuál Strana 30