Commodore VIC-20 - Arithmetic Calculations

Chapter 2 Operating the VIC 20 43
Enter the line exactly as shown; do not type end quotes or press RETURN.
Try to make the necessary change to "HOYT".
PRINT "HOYT DOOS FOR S
ALE
When you tried to backspace to correct "HOYT", the computer printed
a reverse vertical bar. To backspace when editing text in quotation marks,
you will need to exit the quote mode. One way to do this
is to type another
set of quotes. While you must enter quote mode to enter a string, you must
exit quote mode to edit the string.
Another method of escaping from the quote mode
is to hold SHIFT
down and press RETURN. This will move the cursor down one line, allowing
you to move the cursor up and make any changes you like.
While this may seem like
an unwelcome "feature," you can write
programs using cursor keys. For instance, the immediate mode statement
HELLO DOWN THERE
PR I NT II :-rr'.I-IELLO DOWN TH
ERE"
READY •
•
displays the text above the PRINT statement instead of below it, as would
normally
be the case.
ArIthmetic calculations
The VIC 20 can perform the four standard mathematical operations:
addition, subtraction, multiplication, and division. The symbols for
addition and subtraction are the familiar plus sign and minus sign, but an
asterisk
is used for mUltiplication and a slash for division. Therefore, to
mUltiply 4 by 4 you would enter
PRINT 4*4
or
?4*4
To divide 8 by 2 you would enter
PRINT e ..... :z
or