Language Elements
46
NetLinx Programming Language Reference Guide
DEFINE_CALL 'My Subroutine' (INTEGER INT1)
LOCAL_VAR INTEGER INT2
{
(* body of subroutine *)
}
DEFINE_CALL 'My Subroutine' (INTEGER INT1)
{
LOCAL_VAR INTEGER INT2
(* body of subroutine *)
}
The scope of a local variable is restricted to the statement block in which it is declared. A local variable
is either static or non-static, depending on whether it is declared as
LOCAL_VAR or STACK_VAR:
 The keyword LOCAL_VAR specifies a static variable. A static variable's value is initialized the
first time the statement block in which it is declared is executed and retained after execution of
the statement block has finished.
 The STACK_VAR keyword specifies a non-static variable. A non-static variable's value is re-
initialized every time the statement block in which it is declared is executed.
 If neither the LOCAL_VAR nor the STACK_VAR keyword is specified, STACK_VAR is assumed
(default).
IF (X > 10)
{
LOCAL_VAR INTEGER INT2 // static (permanent)
STACK_VAR CHAR ARRAY1[10] // non-static (temporary)
(* statements *)
}
LOCAL_VAR and STACK_VAR can be used interchangeably in any statement block except for waits.
Only
LOCAL_VAR variables may be declared inside a wait block.
WAIT 10, 'My Wait Name'
{
LOCAL_VAR CHAR TempBuf[80]
(* statements *)
}
A name assigned to a local variable must be unique within the statement block in which it is declared and
any statement block enclosing that block. Therefore, non-nested statement blocks can define the same
local variable name without conflict. For example:
A static variable maintains its value throughout the execution of the program,
regardless of whether it is within scope of the current program instruction.
Variable declarations outside of DEFINE_VARIABLE will default to STACK_VAR if
neither "local" or "stack" is specified.
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