Campbell-scientific CR9000X Measurement and Control System Instrukcja Użytkownika Pobierz pdf (Strona 338)

Section 9. Program Control Instructions

For ... Next Statement

Repeats a group of instructions a specified number of times.

Syntax

For counter = start To end [ Step increment ]

[statementblock]

[

Exit For]

[statementblock]

Next [counter [, counter][, ...]]

The For...Next statement has these parts:

PART

DESCRIPTION

For Begins a For...Next loop control structure. Must appear

before any other part of the structure.

counter Numeric variable used as the loop counter. If the variable

used is an index into an array, the index cannot be a variable

(e.g., Variable(1) can be used, but Variable(i) cannot).

start Initial value of counter.

To Separates start and end values.

end Final value of counter.

Step Indicates that increment is explicitly stated.

increment Amount counter is changed each time through the loop. If

you do not specify Step, increment defaults to one.

[statementblock] Program lines between For and Next that are executed the

specified number of times.

Exit For Used within a For...Next control structure to provide an

alternate way to exit. Any number of Exit For statements

may be placed anywhere in the For...Next loop. Often used

with the evaluation of some condition (for example,

If...Then), Exit For transfers control to the statement

immediately following the Next.

Next Ends a For...Next construct. Causes increment to be added

to counter.

The Step value controls loop execution as follows:

When Step is

Loop executes if

Positive or 0 counter <= end

Negative counter >= end

Once the loop has been entered and all the statements in the loop have

executed, Step is added to counter. At this point, either the statements in the

loop execute again (based on the same test that caused the loop to execute in

the first place), or the loop is exited and execution continues with the statement

following the Next statement.

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