Global Variables - AMX NETLINX PROGRAMMING LANGUAGE Manual

Define_function integer MyFunc(INTEGER nFlag)
{
.
.
}
Define_function integer MyFunc(INTEGER nFlag)
{
}
The general form of a static local variable declaration is:
[LOCAL_VAR] [VOLATILE | PERSISTENT] [CONSTANT] [<type>] name
The general form of the non-static local variable declaration is:
[STACK_VAR] [<type>] name
Since non-static local variables are allocated on the program stack (a block of memory reserved for
allocation of temporary variables), the keywords
apply.

Global variables

Global variables are defined in the
DEFINE_VARIABLE
CONSTANT INTEGER MAXLEN = 64
CHAR STR[MAXLEN] = 'No errors were found.'
INTEGER ARRAY[ ] = {100, 200, 300}
A global variable is accessible throughout the module or program in which it is defined. Global variables
retain their value as long as the program runs. They may retain their value after powering down or
reloading the system, depending on the variable's persistence attributes (
NetLinx Programming Language Reference Guide
LOCAL_VAR INTEGER n
IF (nFlag > 0)
{
LOCAL_VAR INTEGER n
.
.
}
IF (nFlag > 0)
{
LOCAL_VAR INTEGER n
.
.
}
else
{
LOCAL_VAR INTEGER n
}
DEFINE_VARIABLE
// illegal declaration
// legal declaration
, , and
VOLATILE PERSISTENT
section of any program module. For example:
VOLATILE
Language Elements
do not
CONSTANT
and ).
PERSISTENT
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