Commodore 64 User Manual page 38

PLUS AND MINUS KEYS
PLUS KEY:
ADDITION
To add, use the (plus) key by itself. You
don't even need to hold down the SHIFT
key. Type:
PRINT 4 + 3
Your addition problem appears on the screen.
SCREEN 1
Then, press the RETURN key. The computer
prints the answer.
SCREEN 2
You can use this method whenever you want
the computer to solve an addition problem
for you.
MINUS KEY:
SUBTRACTION
To subtract, use the (minus) key. Type the
following equation, only this time, type a
question mark (SHIFT plus the QUESTION
MARK/SLASH key) instead of the word PRINT:
75-2
Your subtraction problem appears on the
screen.
SCREEN 3
Then, press RETURN to see the results.
SCREEN 4
The word PRINT and the ? (question mark)
can be used interchangeably. They are just
two different ways to give the same command
to your computer.
Do not clear the screen and do not turn off
the computer before going on to the next
exercise.
SCREEN 1
Use the plus key (+) when you want the
computer to add numbers.
SCREEN 2
When you press RETURN, the computer adds
the numbers and displays the answer.
SCREEN 3
Use the minus sign
equations.
-1 In subtraction
SCREEN 4
The computer calculates your equation and
displays the answer.
PLUS key • MINUS key
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