Texas Instruments TI-89 Titanium User Manual

Programming 621
Example: Using Alternative Approaches
The example in the Previews module shows a program that prompts the user to enter an
integer, sums all integers from 1 to the entered integer, and displays the result. This
section gives several approaches that you can use to achieve the same goal.
Example 1
This example uses
InputStr for input, a While...EndWhile loop to calculate the result, and
Text to display the result.
Ê
Prompts for input on Program I/O screen.
Ë Converts string entered with InputStr to an expression.
Ì Loop calculation.
Í Displays output in a dialog box.
Ê
Ë
Ì
©Ì
©Ì
Ì
Í
:prog1()
:Prgm
:InputStr "Enter an integer",n
:expr(n)!n
:0!temp:1!I
:While i{n
: temp+i!temp
: i+1!I
:EndWhile
:Text "The answer is "&string(temp)
:EndPrgm

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches