Commodore CBM - Variables; Special String Symbols

Table 3-1. Special String Symbols
Function
Key
String Symbol
~
(Reverse R)
Reverse On
RVS
~
ON
~
Reverse Off
Shifted RVS
!! (Reverse Sh ifted R)
ON
CLR
Home Cursor
SCREEN
.~
(Reverse S)
HOME
CLR
Clear Screen
Shifted
SCREEN
:'J
(Reverse Shifted S)
HOME
Cursor Down
(CUBOR}
:~l
(Reverse Q)
Cursor Up
Shifted
(CU&R]
:1
(Reverse Sh ifted Q)
Cursor Right
[CU~R]
.1 (Reverse ])
Cursor Left Shifted
lC~R]
Il
(Reverse Sh ifted ])
VARIABLES
ln Chapter 2 we introduced the concept of a variable. We will now describe
variables more thoroughly.
A variable is a data item whose value may change. You type the immedi-
ate mode statement:
F'RHJT 10.,20.,30
10 20 30
The PET will print the three numbers 10, 20, and 30. as illustrated above.
The
PET will print the same three numbers whenever this PRINT statement is ex-
ecuted: that is because this PRINT statement uses constant data ln contras!. you
can
write the immediate mode statement:
A=10:B=20 C=30 PRINT A.B.e
10 20 30
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