Vtech PreComputer Power Pad Plus User Manual - Page 43

Constants

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VARIABLE NAMES CONTENTS A 675 B 2.3434 C$ CURTIS A$ ALPHABET SOUP Here's an example of storing a string variable: 10 LET A$="ALPHABET SOUP NO 123" You can have a numeric variable called A and a string variable called A$. The $ lets BASIC know how to tell them apart. NOTE: For both numeric and string variables, only the first 2 characters of the variable names are valid. Also, they cannot resemble the name of any command. Examples: TOTAL is interpreted as the TO command and POTATO is interpreted as variable PO. CONSTANTS A constant is something that doesn't change. The computer stores it in memory just like a variable. However, since a constant doesn't change it has no variable name. The number 6 is a constant; so is 4.567 or 28967.35. "QUICK BROWN FOX" is a string constant. You can store constants to a variable. That's usually done to start out a program; later the contents of the variables change. Suppose we want to count to 10. Type in this program: New 10 N=0 20 N=N+1 30 PRINT N 40 IF N

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39
VARIABLE NAMES
CONTENTS
A
675
B
2.3434
C$
CURTIS
A$
ALPHABET SOUP
Here’s an example of storing a string variable:
10
LET A$=“ALPHABET SOUP NO 123”
You can have a numeric variable called A and a string variable called A$.
The $ lets
BASIC
know how to tell them apart.
NOTE
: For both numeric and string variables, only the first 2 characters of the variable
names are valid.
Also, they cannot resemble the name of any command.
Examples
:
TOTAL
is interpreted as the
TO
command and
POTATO
is interpreted as variable
PO
.
CONSTANTS
A constant is something that doesn’t change.
The computer stores it in memory just like
a variable.
However, since a constant doesn’t change it has no variable name.
The number
6 is a constant; so is 4.567 or 28967.35.
“QUICK BROWN FOX” is a string constant.
You can store constants to a variable.
That’s usually done to start out a program; later
the contents of the variables change.
Suppose we want to count to 10.
Type in this program
:
New
press
ENTER
10
N=0
press
ENTER
20
N=N+1
press
ENTER
30
PRINT N
press
ENTER
40
IF N<10 THEN 20
press
ENTER