LEN(A$+B$) Returns the combined length of the
two
strings.
LEFT$(ST$,l) Returns the leftmost character of the string
ST$.
The following functions constitute the format function group:
SPC
Space over.
TAB Tab over.
POS
Next
print
position.
You
will
use format functions to display or print information using any
desired format.
SPC
and TAB take a single numeric argument.
POS
uses a
dummy
argument of
O.
Examples:
SPC(10)
TAB(A)
Move cursor over 10 spaces.
Move cursor to column
A+l.
PEEK
TI$,TI
FRE
Finally there are some
"system"
functions vou
will
not use until vou are a
more experienced programmer.
The system function group includes these
functions:
Fetches the contents of a memory byte.
Fetches System Time,
as
maintained by a program clock.
Returns available Free Space - the number of unused
read/write
memory bytes.
SYS
Transfers to Subsystem.
USR
Transfers to User Assembly Language Program.
System functions are useful only
in
certain classes of special programming.
They are
not
used
in
typical
PET
programs.
PET BASIC also allows you to define your
own
functions
with
the DEF
FN function.
These functions are ail described in detail in Chapter
4.
73
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