Campbell-scientific CR9000X Measurement and Control System Manual de usuario descargar pdf (Pagina 339)

100

101

Section 9. Program Control Instructions

Changing the value of counter while inside a loop can make the

program more difficult to read and debug.

TIP

You can nest For...Next loops by placing one For...Next loop within another.

Give each loop a unique variable name as its counter. The following

construction is correct:

For J = 5 To 1 Step -1 'Loop 5 times backwards.

For I = 1 To 12 'Loop 12 times.

. . . . 'Run some code.

Next I

. . . 'Run some code.

Next J

. . . . 'Run some code.

If you omit the variable in a Next statement, the value of Step

increment is added to the variable associated with the most

recent For statement. If a Next statement is encountered before

its corresponding For statement, an error occurs.

NOTE

Nested For...Next Statement Bubble Sort Example

If Flag(3) Then 'Perform Bubble Sort based on

Flag(3)

For K = 1 To 29

For I = 30 To (K) Step -1

If PlaceDist(I) > PlaceDist(K) Then

DistD = PlaceDist(K) 'Dummies to hold Place K values

TractorD = TractorNum(K)

PlaceDist(K) = PlaceDist(I) 'Assign New Standing

TractorNum(K) = TractorNum(I)

PlaceDist(I) = DistD

TractorNum(I) = TractorD

EndIf

Next I

Next K

Flag(3) = False

EndIf

This next example fills odd elements of X up to 40 * Y with odd numbers.

For I = 1 To 40 * Y Step 2

X( I ) = I

Next I

9-9

1 2 ... 334 335 336 337 338 339 340 341 342 343 344 ... 441 442

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Campbell-scientific CR9000X Measurement and Control System Manual de usuario Pagina 339

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