Commodore PET - Format Conventions; BASIC Commands; Clr; Cont

fORMAT CONVENTIONS
The following conventions are used in the format presentations:
UPPER CASE Words in upper case are constant and must be typed in
exactly as shown.
lower case Words in lower case are variable; the exact wording or
value
is supplied by the programmer.
Braces indicate a choice of items; braces do not appear
in an actual statement.
Ellipses indicate
that the preceding item can be re-
peated; ellipses do not appear in actual statements.
line number ln the format presentations, a beginning line number
is
implied for ail stored program statements.
variable Unless otherwise specified, a variable may
be un-
subscripted
(a simple variable) or subscripted (an array
element).
BASIC COMMANDS
CLR
The Clear command, CLR, reinitializes ail of the PETs "system" pointers to
user program variables and initializes the Stack Pointer. This
is equivalent to turn-
ing the
PET off, then turning it back on, and loading a fresh copy of the program
into memory.
Format:
CLR
After CLR, ail numeric variables are assumed to have values of zero and ail
string variables are assumed to have null values until the variable is given a
different value by a program or immediate mode assignment.
PET BASIC state-
ments
that can assign values to variables are LET=, GET, GET#, INPUT, INPUT#,
and
READ.
CLR may be given in immediate or program mode.
Example:
CLR
CONT
The Continue commando CONT, resumes program execution after a BREAK.
A break is usually caused by pressing the STOP key in immediate mode or execut-
ing a STOP statement in program mode.
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