Atari XL

22
The Atari XL Handbook
I
HEIGHT
AREA
= WIDTH X HEIGHT
1
..
WIDTH
•
names instead of numbers we can write a program
to work out the area of any rectangle:
10 WIDTH = 8
20 HEIGHT
= 12
30 AREA = WIDTH * HEIGHT
40 PRINT "AREA
= "; AREA
This program, when RUN, will print the area of a
rectangle 12 inches by 8 inches. By changing the
numbers in lines 10 and 20 we can obtain the area
of a rectangle of any size.
VARIABLE NAMES
A variable name can have as many as 114
characters. All variable names must begin wi th a
letter, but the other characters may be numbers,
for example Al, EGG7, LAST1. There must not be
any spaces in a variable name as this will confuse
the computer.
NOTE
You cannot use as a variable name any
of the BASIC command words, or any
name which begins wi th the letters of a
BASIC
command word. If you do, the
Atari will complain of errors as soon as
you type the line. For example, the
name LENGTH begins with LEN, and