• String operations. PAD demonstrates
how
to convert
an
object to
string form,
count
the
number
of characters,
and
concatenate two
strings.
Program
«
-tSTR
WHILE
DUP
SIZE
REPEAT
II
II
SWAP
END
»
I ENTER I
CJ
PAD I STO I
23
<
+
Comments
Begin the program.
Make sure the object is in string
form. (Strings are unaffected
by
this command.)
Begin WHILE clause.
Does the string contain fewer
than
23 characters?
Begin
REPEAT
clause.
Add
a leading space.
End
REPEAT
clause.
End
the
program.
Put
the
program
on
the
stack.
Store the program as PAD.
Example. PAD is demonstrated in
the
program BDISP.
PRESERVE (Save and Restore Previous Status)
Given a program
on
the
stack, store
the
current status, execute the
program,
and
then
restore
the
previous status.
Arguments
Results
1 :
«
program
»
1 : (result
of
program)
Techniques:
• RCLF
and
STOF. PRESERVE uses RCLF
(recall
[lags)
to record
the
current status of the calculator in a binary integer
and
STOF
(store
[lags)
to restore the status from
that
binary integer.
258
28:
Programming
Examples
I
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