Commodore 128D - Inputting Data; The INPUT Command; Assigning a Value to a Variable

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Inputting Data
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The computer will count backward from 100 to 0, in units of 10.
If you don't use a STEP command with a FOR statement, the com
puter will automatically increment the counter by units of 1.
The parts of the FOR-NEXT command in line 10 are:
FOR — word used to indicate beginning of loop
X — counter variable; any number variable can be used
1 — starting value; may be any number, positive or nega
tive
TO —connects starting value to ending value
100 — ending value; may be any number, positive or negative
STEP — indicates an increment other than 1 will be used
-10 — increment; can be any number positive or negative
The INPUT Command
Assigning a Clear the computer's memory by typing NEW
Value to a and pressing RETURN, and then type and RUN
Variable this program.
10K = 10
20 FOR 1 = 1 TO K
30 ? "COMMODORE"
40 NEXT
In this program you can change the value of K in
line 10 to make the computer execute the loop
as many times as you want it to. You have to do
this when ypu are typing the program, before it
is RUN. What if you wanted to be able to tell the
computer how many times to execute the loop
at the time the program is RUN?
In other words, you want to be able'to change
the value of the variable K each time you run the
program, without having to change the program
itself. We call this the ability to interact with the
computer. You can have the computer ask you
how many times you want it to execute the loop.
To do this, use the INPUT command. For exam
ple, replace line 10 in the program with:
10 INPUT K
55 USING C128 MODE-Advanced BASIC Programming
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