Commodore Plus 4 - Using Variables

USING The example 36*(12+(AZ3)) shows one of the most powerful features
VARIABLES of a comPuter When we used a letter instead of a number in a mathe
matical problem, we used a VARIABLE. A variable represents a value.
10A = 3
20 PRINT "TOTAL:";A * 4
If you RUN this program, the screen result is:
TOTAL 12
There are three types of variables you can use
TYPE
Floating
point
Integer
Text string
SYMBOL
7o
s
DESCRIPTION
real (decimal)
or whole numbers
whole numbers
letters, numbers,
and all olher
characters
in quotes
SAMPLE
EXAMPLES VALUES
X. AB. T4
X%, Al%
X$, MS$
23.5, 12,
1.3E + 2
15, 102.3
'TOTAL:-.
"DAYIVCBM"
Every time you want a variable to be an integer variable, the symbol
for that variable would include the % sign. A variable that contains text
p^ MUST end with a S as part of the variable. If it doesn't have that symbol,
your Plus/4 considers it a floating point number. A variable without
_ either of the symbols (% or $) is read as a floating point number (a
"regular" number). Integer variables are a subset of floating point vari
ables; they are numbers with no decimal places
Always use the right variable type. If you try to do something like assign
___ a word to an integer variable, your program won't work. This program
shows you what variable can or can't be used in a given situation, and
you can find out what happens when you try out different types of data.
10 REM THIS PROGRAM NEEDS NUMERIC DATA
20 PRINT "ENTER A NUMBER"
— 30 INPUT x% — ■ I this is the variable
40 PRINT "NICE GOING, ACE! "
to be input
— 50 PRINT "I READ YOUR NUMBER AS"; X%
Try to enter these values and see what happens:
ONE FIFTH
.043
10
64™