HP 50g Graphing, 48gII Graphing manual To set up a choose box

You can specify a help message and the type of data that must be entered in field by entering field specifications as lists. For example, { { "Name:" "Enter your name" 2 } } defines the Name field, displays Enter your name across the bottom of the input form, and accepts only object type 2 (strings) as input.

To set up a choose box:

1.Enter a title string for the choose box.

2.Enter a list of items. If this is a list of twoele ment lists, the first element is displayed in the choose box, and the second element is returned to level 2 when OK is pressed.

3.Enter a position number for the default highlighted item. (0 makes a viewonly choose box.)

4.Execute the CHOOSE command.

Example: Enter a title "FIRST ONE" `.

Enter a list of items { ONE TWO THREE } `.

Enter a position number for default highlighted value 3 `.

Execute CHOOSE (!°L%IN% %CHOOS%).

Example: The following choose box appears:

Example: The following program uses input forms, choose boxes, and message boxes to create a simple phone list database.

Program:	Comments:
«
'NAMES' VTYPE	Checks if the name list
IF 1 ==	(NAMES) exists, if not, creates
THEN { } 'NAMES' STO	an empty one.
END
WHILE	While cancel is not pressed,
"PHONELIST OPTIONS:"	creates a choose box that lists
{	the database options. When
{ "ADD A NAME" 1 }	OK is pressed, the second
{ "VIEW A NUMBER" 2 }
	item in the list pair is returned
} 1 CHOOSE
	to the stack.
REPEAT → c «	Stores the returned value in c.
CASE c 1 ==	Case 1 (ADD name), while
THEN	cancel is not pressed, do the
WHILE	following:

146 RPL Programming