Reference Guide

1-28 RPL Programming
Example: System Flag. The following program sets an alarm for June 6, 2007 at 5:05 PM. It first tests the status
of system flag –42 (Data Format flag) in a conditional structure and then supplies the alarm date in the current date
format, based on the test result.
Example:
Program: Comments:
«
IF
-42 FC?
Tests the status of flag –42, the Date
Format flag.
THEN
6.152007
If flag –42 is clear, supplies the date in
month/day/year format.
ELSE
15.062007
If flag –42 is set, supplies the date in
day.month.year format.
END
Ends the conditional.
17.05 "TEST COMPLETE"
3 →LIST STOALARM
Sets the alarm: 17.05 is the alarm time
and “TEST COMPLETE” is the
alarm message.
»
Example: User Flag. The following program returns either the fractional or integer part of the number in level 1,
depending on the state of user flag 10.
Program: Comments:
«
IF
Starts the conditional.
10 FS?
Tests the status of user flag 10.
THEN
IP
If flag 10 is set, returns the integer part.
ELSE
FP
If flag 10 is clear, returns the fractional part.
END
Ends the conditional.
»
To use this program, you enter a number, either set flag 10 (to get the integer part) or clear flag 10 (to get the
fractional part), then run the program.
Recalling and Storing the Flag States
If you have a program that changes the state of a flag during execution, you may want it to save and restore original
flag states.
The RCLF (recall flags) and STOF (store flags) commands let you recall and store the states of the calculator’s flags.
For these commands, a 64-bit binary integer represents the states of 64 flags — each 0 bit corresponds to a flag
that’s clear, each 1 bit corresponds to a flag that’s set. The rightmost (least significant) bit corresponds to system flag
–1 or user flag 1 for the lower groups and system flag –65 or user flag 65 for the upper groups.