Number Representations - Parallax BASIC Stamp 2e Programming Manual

4: BASIC Stamp Architecture – Number Representations
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UNTIME ATH AND OGIC
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UMBER EPRESENTATIONS
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The BASIC Stamp, like any computer, excels at math and logic. However,
being designed for control applications, the BASIC Stamp does math a
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little differently than a calculator or spreadsheet program. This section will
sx p
help you understand BASIC Stamp numbers, math, and logic.
In your programs, you may express a number in various ways, depending
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on how the number will be used and what makes sense to you. By default,
the BASIC Stamp recognizes numbers like 0, 99 or 62145 as being in our
everyday decimal (base-10) system. However, you may also use
hexadecimal (base-16; also called hex) or binary (base-2).
Since the symbols used in decimal, hex and binary numbers overlap (e.g.,
1 and 0 are used by all; 0 through 9 apply to both decimal and hex) the
editor software needs prefixes to tell the numbering systems apart, as
shown below:
99 Decimal (no prefix)
$1A6 Hex
%1101 Binary
The BASIC Stamp also automatically converts quoted text into ASCII
codes, and allows you to apply names (symbols) to constants from any of
the numbering systems. For example:
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SYMBOL LetterA
SYMBOL Cheers
SYMBOL Hex128
SYMBOL FewBits
-- or --
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LetterA CON
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Cheers CON
Hex128 CON
FewBits CON
For more information on constants, see the section "Constants and
Compile-Time Expressions", above.
= "A"
= 3
= $80
= %1101
"A" ' ASCII code for A (65).
3
$80
%1101
BASIC Stamp Programming Manual 2.0c • www.parallaxinc.com • Page 59
' ASCII code for A (65).