Appendix
H:
BASIC
Functions 377
POS
POS returns the column position
of
the cursor.
Format:·
POS(data)
data
is
a dummy function; it
is
not used and therefore can have any
value.
POS returns the current cursor position.
If
no cursor
is
displayed, the
current character position within a program line
or
string variable
is
returned. Character positions begin at 0 for the leftmost character.
Recall that program logic processes 80-character lines even though the
VIC
20
computer has a 22-character display.
If
program logic in such a
computer
is
processing a character in the second half of the line, the POS
function will return a value between the beginning and the end
of
the line (in
other words,
23
to 44).
By
concatenation, string variables with up to
255
characters may be
generated.
If
program logic
is
processing a long string, then the POS
function will return the character position currently being processed. Under
these circumstances the POS function will return a value ranging between 0
and
255.
Example:
?POS(l)
At the beginning of a line, returns 0
?"AJlCABC"iPOS(l)
With a previous POS value of 0, displays a POS value of 6
RIGHT$
RIGHT$ returns the rightmost characters in a string.
Format:
RIGHT$(arg$,byte)
byte
identifies the number
of
rightmost characters that are extracted
from the string specified by
arg$.
Example:
RIGHT$(ARG,2)
Displays RO
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