HP 35s User Manual page 222

Annunciators for Set Flags
Flags 0, 1, 2, 3 and 4 have annunciators in the display that turn on when the
corresponding flag is set. The presence or absence of 0, 1, 2, 3 or 4 lets you know
at any time whether any of these five flags is set or not. However, there is no such
indication for the status of flags 5 through 11. The states of these flags can be
determined by executing the FS? instruction from the keyboard. (See "Using Flags"
below.)
Using Flags
 
Pressing
After selecting the function you want, you will be prompted for the flag number (0–
11). For example, press

()
set flag 11.
Menu Key
 n
 n
 n
A flag test is a conditional test that affects program execution just as the comparison
tests do. The FS? n instruction tests whether the given flag is set. If it is, then the next
line in the program is executed. If it is not, then the next line is skipped. This is the
"Do if True" rule, illustrated under "Conditional Instructions" earlier in this chapter.
If you test a flag from the keyboard, the calculator will display "" or "".
14-12
Programming Techniques
displays the FLAGS menu:   
 

to set flag 10; press
FLAGS Menu
Set flag. Sets flag n.
Clear flag. Clears flag n.
Is flag set? Tests the status of flag n.

() to set flag 0; press
 
Description


() to