Commodore VIC-20 User Manual page 79

Chapter 3 Programming the VIC 20 Computer
65
T
ABU
3-1.
Special String Symbols
Function Key String Symbol
Reverse On
CTRL
~
ON
u:a
(Reverse R)
Reverse Off
CTRL
c;J
OFF
~
(Reverse Shifted R)
Home Cursor
~
HOME
B9I
(Reverse S)
Clear Screen
Shifted
~
HOME
U
(Reverse Shifted S)
Cursor Down
[c6
R ]
00
(Reverse Q)
Cursor Up
Shifted
[c6
R ]
D
(Reverse Shifted Q)
Cursor Right
[C~R)
I!I
(Reverse
]f
Cursor Left
Shifted
(C~R]
.1
(Reverse Shifted ])
VARIABLES
The concept of a variable is easy to understand. Consider the following
statements:
100 A=B+C
200 ?A
These two statements cause the sum of two numbers to be displayed.
The two numbers are whatever Band C represent at the time the statements
are executed. In the following example
90 B=4.65
95 C .. 3.?2
100 fI"B+C
200 ?R
B is assigned the value 4.65, while C is assigned the value 3.27. Therefore, A
equals 8.37.