Page 20 • BASIC Stamp II Manual 0.94 • Parallax, Inc. • (916) 624-8333
BASIC Stamp II
symbol VAR variable.modifiers
- symbol is a unique name for a variable
- variable is a defined variable name
- .modifiers are optional and used to define variables-within-variables
The compiler will group all declarations by size (in the case of unique
variables) and assign them to unused RAM. Alt-M lets you see the
result of this process. Non-unique variables are in-whole or in-part
derived from unique variables and get assigned within the unique-
variable memory.
Keep in mind that you may make alias names for the pin variables:
keyin var in5 ‘make “keyin” a way to read P5’s state.
Note for Stamp I users: W0-W12 (and the corresponding B0-B25) are pre-
defined by the compiler software to make use of Stamp I programs easier. If
you use a Stamp I program with the Stamp II, you can enter the older “Wx”
and “Bx” variable names without having to define them first.
The CON statment - defining constants
The CON statement is similar to the VAR statement, except that it is
for defining constant values and assigning them to symbolic names.
This is handy for having a single declaration which gets accessed
throughout your program. The CON syntax is as follows:
symbol CON expression ‘assign expression to “symbol”
- symbol is a unique symbolic name for a constant
- expression is a compile-time-resolvable constant
level CON 10 ‘“level” is same as 10 in program
limit CON 10*4<<2 ‘“limit” is 160
expressions after CON can contain the following binary operators and
are resolved left-to-right:
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