Do...Loop

Syntax

Do Instructions Loop

or

Do Instructions Loop Until Condition

or

Do Instructions Loop While Condition

Overview

Execute a block of instructions until a condition is true, or while a condition is false, or create an infinite loop.

Example 1

Device = 24HJ128GP502             ' Select the device to compile for
Declare Xtal = 16

Dim MyWord as Word
MyWord = 1
Do                               ' Create a loop
  Print Dec MyWord, " "
  DelayMs 200
  Inc MyWord
Loop Until MyWord > 10            ' Loop until MyWord is greater than 10

Example 2

Device = 24HJ128GP502
Declare Xtal = 16

Dim MyWord as Word
MyWord = 1
Do                               ' Create a loop
  Print Dec MyWord, " "
  DelayMs 200
  Inc MyWord
Loop While MyWord < 11           ' Loop while MyWord is less than 11

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Example 3

Device = 24HJ128GP502             ' Select the device to compile for
Declare Xtal = 16

Dim MyWord as Word
MyWord = 1
Do                               ' Create a loop
  Print Dec MyWord, " "
  DelayMs 200
  Inc MyWord
Loop                              ' Loop forever

Notes.

Do-Loop differs from the While-Wend type in that, the Do loop will carry out the instructions within the loop at least once like a Repeat-Until type, then continuously until the condition is true, but the While loop only carries out the instructions if the condition is true.

Do-Loop is an ideal replacement to a For-Next loop, and can actually take less code space, thus performing the loop faster.

The above example 2 and example 3 show the equivalent to the For-Next loop: -

For MyWord = 1 to 10 : Next

See also : While...Wend, For...Next...Step.

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