Texas-instruments PLUS TI-89 User Manual download pdf (Page 315)

100

101

298 Chapter 17: Programming

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 298 of 40

For example:

:For i,0,5,1

: Disp i

:EndFor

:Disp i

While...EndWhile

loop repeats a block of commands as long as a

specified condition is true. The syntax of the

While

command is:

While

condition

When

While

is executed, the condition is evaluated. If

condition

true, the loop is executed; otherwise, program control jumps to the

command following

EndWhile

:While x<5

: --------

:EndWhile

:--------

At the end of the loop (

EndWhile

), program control jumps back to

the

While

command, where

condition

is re-evaluated.

To execute the loop the first time, the

condition

must initially be

true.

¦ Any variables referenced in the

condition

must be set before the

While

command. (You can build the values into the program or

prompt the user to enter the values.)

¦ The loop must contain commands that change the values in the

condition

, eventually causing it to be false. Otherwise, the

condition

is always true and the program cannot exit the loop

(called an infinite loop).

For example:

:While x<5

: Disp x

: x+1

:EndWhile

:Disp x

Tip:

You can declare the

counter variable as local

(pages 288 and 290) if it

does not need to be saved

after the program stops.

While...EndWhile

Loops

Note:

The

While

command

does not automatically

change the condition. You

must include commands

that allow the program to

exit the loop.

Displays 0, 1, 2, 3, 4, and 5.

Displays 6. When

variable

increments to 6, the loop

is not executed.

Initially sets x.

Displays 0, 1, 2, 3, and 4.

Increments x.

Displays 5. When x

increments to 5, the loop is

not executed.

x < 5x

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Texas-instruments PLUS TI-89 User Manual Page 315

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