Campbell CR800 Dokumentacja Pobierz pdf (Strona 245)

Section 9. Program Control Instructions

Do … Loop

Repeats a block of statements while a condition is true or until a condition

becomes true.

Syntax 1

Do [{While | Until} condition]

[statementblock]

[Exit Do]

[statementblock]

Loop

Syntax 2

[statementblock]

[Exit Do]

[statementblock]

Loop [{While | Until} condition]

The Do...Loop statement has these parts:

Part Description

Do Must be the first statement in a Do...Loop control structure.

While Indicates that the loop is executed while condition is true.

Until Indicates that the loop is executed until condition is true.

condition Numeric expression that evaluates true (nonzero) or false (0

or Null).

statementblock Program lines between the Do and Loop statements that are

repeated while or until condition is true.

Exit Do Only used within a Do...Loop control structure to provide

an alternate way to exit a Do...Loop. Any number of Exit

Do statements may be placed anywhere in the Do...Loop.

Often used with the evaluation of some condition (for

example, If...Then), Exit Do transfers control to the

statement immediately following the Loop. When

Do...Loop statements are nested, control is transferred to the

Do...Loop that is one nested level above the loop in which

the Exit Do occurs.

Loop Ends a Do...Loop

Do...Loop Statement Example

The example creates an infinite Do...Loop that can be exited only if Volt(1) is

within a range.

Dim Reply 'Declare variable.

Reply = Volt(1)

If Reply > 1 And Reply < 9 Then 'Check range.

Exit Do 'Exit Do Loop.

EndIf

Loop

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