Texas Instruments TI-89 Voyage 200, User Manual

Page: 637 / 1008

Programming 637
Example: Using Alternative Approaches Example: Using Alternative Approaches Example: Using Alternative Approaches 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
Example 1 Example 1
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