AMX NETLINX PROGRAMMING LANGUAGE, Руководство пользователя, Страница: 48 / 246

Language Elements
32 NetLinx Programming Language Reference Guide
If it is non-zero, the channel associated with the device is turned on.
If it is zero, the channel is turned off.
Conditionals
IF…ELSE
The
IF...ELSE
statement provides a structure for conditional branching of program execution. If a
condition evaluates to true, the statement(s) associated with it are executed; otherwise, statements are not
executed. An example is:
IF (<conditional expression 1>)
{
(* statements for condition 1 *)
}
ELSE IF (<conditional expression 2>)
{
(* statements for condition 2 *)
}
ELSE
{
(* statements for all other conditions *)
}
Regarding
IF
statements:
ELSE IF
is optional.
Braces are generally recommended in all cases but are only required if multiple statements are
assigned to a given condition.
IF
statements may be nested to any number of levels.
SELECT…ACTIVE
The
SELECT…ACTIVE
statement provides a programming structure for selective execution of code
blocks based on the evaluation of a series of conditions. The first block whose
ACTIVE
condition
evaluates to true is executed; the remaining blocks are ignored. If no
ACTIVE
condition evaluates to true,
no statements are executed. An example is:
SELECT
{
ACTIVE (<condition 1>) :
{
(* statements for condition 1*)
}
ACTIVE (<condition 2>) :
{
(* statements for condition 2*)
}
ACTIVE (<condition n>) :
{
ACTIVE (1)
(* statements for condition n*)
}
}