HP Prime Graphing Wireless Calculator - Manual (Page 298)

294 Programming in HP PPL
I/O
I/O commands are used for inputting data into a
program, and for outputting data from a program. They
allow users to interact with programs.
CHOOSE Syntax: CHOOSE(var, "title", "item1",
"item2",…,"itemn")
Displays a choose box with the title and containing the
choose items. If the user selects an object, the variable
whose name is provided will be updated to contain the
number of the selected object (an integer, 1, 2, 3, …) or
0 if the user taps
.
Returns true (not zero) if the user selects an object;
otherwise, returns false (0).
Example:
CHOOSE
(N,"PickHero",
"Euler","Gauss
","Newton");
IF N==1 THEN
PRINT("You
picked
Euler"); ELSE
IF N==2 THEN PRINT("You picked
Gauss");ELSE PRINT("You picked
Newton");
END;
END;
After execution of CHOOSE, the value of N will be updated
to contain 0, 1, 2, or 3. The IF THEN ELSE command
causes the name of the selected person to be printed to
the terminal.