Beginning Programming Using Retro Computing: Learn BASIC with a Commodore Emulator

© Gerald Friedland 2019

Gerald FriedlandBeginning Programming Using Retro Computinghttps://doi.org/10.1007/978-1-4842-4146-2_9

9. Math and Variables

Gerald Friedland¹ 

(1)

Berkeley, CA, USA

 

Can you do math with variables ? Yes, you can!

Try this:

AGE=6 (press RETURN)

PRINT AGE+1 (press RETURN)

What happened?

The result is 7 because AGE is 6 and 6+1=7.

What happens when you try this:

PRINT AGE+2 (press RETURN)

PRINT AGE+3 (press RETURN)

AGE stays 6, and 6+2=8 and 6+3=9. No surprise here.

You can check that AGE is still 6 by typing this:

PRINT AGE

Press RETURN.

Here is the result:

AGE never changed.

Now try this:

AGE=AGE+1 (press RETURN)

PRINT AGE (press RETURN ...