Pinnacle Speakers DEKO500 Manuale Utente
Macro Programming Language
121
Deko500 User’s Guide
For example, an array named
$table
might include these elements:
$table[3]
$table[42]
$table[$count+1]
$table[9999]
Deko500 allocates array elements as needed. The subscripted variables in the above
example will occupy only four variable slots, not ten thousand.
example will occupy only four variable slots, not ten thousand.
By default, most variables are local variables. A local variable is allocated
temporarily during macro playback, then deleted automatically when the macro stops.
One macro cannot reference a second macro’s local variables, even if the second
macro is a subroutine of the first.
temporarily during macro playback, then deleted automatically when the macro stops.
One macro cannot reference a second macro’s local variables, even if the second
macro is a subroutine of the first.
Global variables must be declared with the
global
command, and can be shared
among multiple macros. Once declared, a global variable remains until you either
delete it by using the
delete it by using the
free
command, or exit Deko500.
Deko500 has a set of built-in global variables, known as system variables, which
provide information about the state of your system. System variables are preceded by
the at-sign symbol (
provide information about the state of your system. System variables are preceded by
the at-sign symbol (
@
), and are often referred to as at-sign variables.
Some system variables are read-only; you cannot change their values. Examples of
read-only system variables are
read-only system variables are
@lines
and
@dots
, which describe the current video
standard, and the pre-defined colors
@red
,
@blue
and
@green
.
Other system variables may be assigned values. For example, the system variable
@wordwrap
can be set to 0 to disable word wrap, or 1 to enable it
O
PERATORS
In the previous topic, you saw that variable assignment is indicated by the equal sign
(=), which is just one of many symbols, known as operators, that represent operations
performed on data.
(=), which is just one of many symbols, known as operators, that represent operations
performed on data.
The Deko500 Macro Programming Language uses a subset of the operators available
in C, as well as a few additions specific to Deko500.
in C, as well as a few additions specific to Deko500.
Arithmetic operators perform mathematical operations within expressions:
Operator
Expression
Operation
+
$a + $b
adds $a and $b
-
$a - $b
subtracts $b from $a
*
$a * $b
multiplies $a by $b
/
$a / $b
divides $a by $b
%
$a % $b
calculates remainder of $a/$b
-
-$a
negates the value of $a
You can perform arithmetic operations on one-character strings by adding or
subtracting integer values to the character. For example, the expression
subtracting integer values to the character. For example, the expression
"A"+1
has
the value
"B"
.
Using single quotation marks in an expression yields the numerical value of the
character key. For example,
character key. For example,
’A’+1
has the value
66
.