VTech PreComputer Prestige Course Manual page 41

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.
5. 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.
Type in this program:
New
10 N=0
20 N=N+1
30 PRINT N
40 IF N<10 THEN 20
50 PRINT "THE ANSWER IS"; N
RUN
The statement at line 10 stores the numeric constant zero into N, a numeric variable. In
statement 20 the variable will have a numeric constant, 1, added to itself and then the
sum of that operation will be stored in place of the value previously stored there.
Let's see. Suppose we want to count to 10.
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