Texas-instruments PLUS TI-89 User Manual download pdf (Page 316)

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101

Chapter 17: Programming 299

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 299 of 40

Loop...EndLoop

creates an infinite loop, which is repeated

endlessly. The

Loop

command does not have any arguments.

:Loop

: --------

:EndLoop

:--------

Typically, the loop contains commands that let the program exit

from the loop. Commonly used commands are:

Exit

Goto

, and

Lbl

(label). For example:

:Loop

: Disp x

: x+1

: If x>5

: Exit

:EndLoop

:Disp x

In this example, the

command can be anywhere in the loop.

When the If command is: The loop is:

t the beginning of the loop Executed only if the condition is true.

t the end of the loop Executed at least once and repeated

only if the condition is true.

The

command could also use a

Goto

command to transfer program

control to a specified

Lbl

(label) command.

The

Cycle

command immediately transfers program control to the

next iteration of a loop (before the current iteration is complete).

This command works with

For...EndFor

While...EndWhile

, and

Loop...EndLoop

Although the

Lbl

(label) and

Goto

commands are not strictly loop

commands, they can be used to create an infinite loop. For example:

:Lbl START

: --------

:Goto START

:--------

As with

Loop...EndLoop

, the loop should contain commands that let

the program exit from the loop.

Loop...EndLoop

Loops

Note: The

Exit

command

exits from the current loop.

Repeating a Loop

Immediately

Lbl and Goto

Loops

command checks

the condition.

Exits the loop and jumps to

here when x increments to 6.

1 2 ... 311 312 313 314 315 316 317 318 319 320 321 ... 622 623

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Texas-instruments PLUS TI-89 User Manual Page 316

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