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Interactive Programs; Asking For Input - HP -28S Manual

Advanced scientific calculator.
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27
Interactive Programs
Some programs require direction from the user-that is, from you
when you're running the program. When the user must supply values
for variables, a program can ask for input. When the user must
choose among several alternatives, a program can ask for a choice.
This chapter demonstrates how a program can ask for input or a
choice, using the following commands from the PROGRAM CON-
TROL menu.
Command
Description
HALT
Suspend program execution.
s WAIT
Suspend program execution for s seconds.
KEY
Return a key string if a key was pressed.
f
s BEEP
Sound a tone of frequency
f
for s seconds.
CLLCD
Clear the display.
n DISP
Display an object in line n of the display.
CLMF
Restore the normal display when the program completes
execution.
Asking for Input
The following sequence creates a custom input menu for variables
A,
B, and
C
sounds a tone to alert the user, and halts for input.
... -: :
STO ABC
: : -
t'1HW
44~]
,1
BEEP HALT ...
234
27: Interactive Programs
I

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