Commodore 64 User Manual page 123

String Variable Names: A$, A5$, BZ$
Arrays are lists of variables with the same name, using extra numbers
to specify the element of the array. Arrays are defined using the DIM
statement, and may contain floating point, integer, or string variables.
The array variable name is followed by a set of parentheses ( ) enclos-
ing the number of variables in the list.
A(7), BZ%(1 1), A$(50), PT( 20,20)
NOTE: There are three variable names which are reserved for use by
the Commodore 64, and may not be defined by you. These variables
are: ST, TI, and TI$. ST is a status variable which relates to input/output
operations. The value of ST will change if there is a problem loading a
program from disk or tape.
TI and TI$ are variables which relate to the real-time clock built into
the Commodore 64. The variable TI is updated every '/both of a second.
It starts at 0 when the computer is turned on, and is reset only by chang-
ing the value of TI$.
TI$ is a string which is constantly updated by the system. The first two
characters contain the number of hours, the 3rd and 4th characters the
number of minutes, and the 5th and 6th characters are the number of
seconds. This variable can be given any numeric value, and will be
updated from that point.
Tl$ = "101530" sets the clock to 10:15 and 30 seconds AM.
This clock is erased when the computer is turned off, and starts at
zero when the system is turned back on.
OPERATORS
The arithmetic operators include the following signs:
+ Addition
- Subtraction
* Multiplication
/ Division
T Raising to a power (exponentiation)
On a line containing more than one operator, there is a set order in
which operations always occur. If several operations are used together
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