HP 48gII Graphing manual To process the result string from Input, Press @ Õ ! Ê a @, `O Tinput ‰

To process the result string from INPUT:

For simple input, use OBJ→ to convert the string into its corresponding objects.

For sensitive input, use the V option for INPUT to check for valid objects, then use OBJ→ to convert the string into those objects.

For special input, process the input as a string object, possibly extracting data as substrings. Example: The program VSPH on page 141 uses an empty commandline string.

The program SSEC on page 144 uses a commandline string whose char acters form a pattern. The program extracts substrings from the result string.

Example: The commandline string "@UPPER LIMIT@" displays @UPPER LIMIT◄ in the command line. If you press 200 `the return string is "@UPPER LIMIT@200". When OBJ→ extracts the text from the string, it strips away the @ characters and the enclosed characters, and it returns the number 200. (See “Creating Programs on a computer” on page 17 for more inform ation about @ comments.)

Example: The following program, TINPUT, executes INPUT to prompt for the inner and outer radii of a torus, then calls TORSA (page 129) to calculate its surfa ce area. TINPUT prompts for a and b in a tworow command line. The level 1 argument for INPUT is a list that contains:

The commandline string, which forms the tags and d elimiters for two tagged objects. An embedded list specifying the initial cursor position.

The V parameter to check for invalid syntax in the result string.

Program:	Comments:
«
"Key in a, b"	The level 2 string, displayed at the top of
	the stack area.
{ ":a::b:" {1 0} V }	The level 1 list contains a string, a list, and
	the verify option. (To key in the string,
	press @ Õ ! Ê a ™ @
	Ë ! Ê b.
	After you press `to put the finished
	program on the stack, the string is shown
	on one line, with indicating the newline
	character.) The embedded list puts the
	insert cursor at the end of row 1.
INPUT	Displays the stack and commandline
	strings, positions the cursor, sets
	Programentry mode, and suspends
	execution for input.
OBJ→	Converts the string into its component
	objects — two tagged objects.
TORSA	Calls TORSA to calculate the surface area.
»
`O TINPUT ‰	Stores the program in TINPUT.

RPL Programming 143