Chapter 17: Programming 301
17PROGRM.DOC TI-89/TI-92 Plus: Programming (English) Susan Gullord Revised: 02/23/01 1:14 PM Printed: 02/23/01 2:18 PM Page 301 of 40
To enter most of the commonly
used input/output commands, use
the Program Editor’s … I/O toolbar
menu.
To see a submenu that lists
additional commands, select
1:Dialog.
Command Description
getKey Returns the key code of the next key pressed. See
Appendix B for a listing of key codes.
Input Prompts the user to enter an expression. The
expression is treated according to how it is entered.
For example:
¦ A numeric expression is treated as an
expression.
¦ An expression enclosed in "quotes" is treated as
a string.
Input can also display the Graph screen and let the
user update the variables xc and yc (rc and qc in
polar mode) by positioning the graph cursor.
InputStr Prompts the user to enter an expression. The
expression is always treated as a string; the user
does not need to enclose the expression in "quotes".
PopUp Displays a pop-up menu box and lets the user select
an item.
Prompt Prompts the user to enter a series of expressions. As
with Input, each expression is treated according to
how it is entered.
Request Displays a dialog box that prompts the user to enter
an expression. Request always treats the entered
expression as a string.
Getting Input from the User and Displaying Output
Although values can be built into a program (or stored to
variables in advance), a program can prompt the user to enter
information while the program is running. Likewise, a program
can display information such as the result of a calculation.
… I/O Toolbar Menu
Input Commands
Tip: String input cannot be
used in a calculation. To
convert a string to a numeri
c
expression, use the expr
command.