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Vb Script

http://www.apextgi.in/

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What we learn last session?

Branching

Branching using If Then Elsestatement.

Branching using Select Case

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Subjects for session 5

Looping through code.Do Loop

While Wend

For

e!tFor Each

E!it statement.

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Looping Through Code

Looping allo#s $ou to run a group of statementsrepeatedl$.

Some loops repeat statements until a condition isFalse %

others repeat statements until a condition isTrue .

There are also loops that repeat statements aspecific num&er of times.

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Do While/Until

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Looping Through Code

Using Do Loop State!ent)epeats a &loc* of statements #hile a condition is True or until acondition &ecomes True .

The follo#ing looping statements are a+aila&le in ,BScript-

Do / While 0 Until 1 conditionstatements

Exit Dostatements

Loop

Do statementsExit Dostatements

Loop / While 0 Until 1 condition

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Looping Through Code

Using Do Loop State!ent4ou can e!it a Do...Loop &$ using the Exit Do statement.

Because $ou usuall$ #ant to e!it onl$ in certain situations5such as to a+oid an endless loop5 $ou should use the ExitDo

statement in theTrue

statement &loc* of anIf ... Then ... Else statement.

If the condition is False 5 the loop runs as usual.

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Looping Through Code

Using Do Loop State!entDim &Chec*5 Count

&Chec* 7 True - iCount 7 8 9 Initiali:e +aria&les.

Do 9 ;uter loop.

Do While iCount < 28 9 Inner loop .iCount 7 iCount = > 9 Increment Counter.

If iCount 7 >8 Then 9 If condition is True...

&Chec* 7 False 9 set +alue of flag to False.

Exit Do 9 E!it inner loop.

End If

Loop

Loop Until &Chec* 7 False 9 E!it outer loop immediatel$.

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Looping Through Code

Using While Wend State!entE!ecutes a series of statements as long as a gi+en conditionis True .

The While ... Wend statement is pro+ided in ,BScript forthose #ho are familiar #ith its usage.

@o#e+er5 &ecause of the lac* of fle!i&ilit$ in While ... Wend 5it is recommended that $ou use Do ... Loop instead.

The While ... Wend statement is pro+ided in ,BScript forthose #ho are familiar #ith its usage.

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Looping Through Code

Using "or #e$t State!ent)epeats a group of statements a specified num&er of times.

4ou can use For ... Next statements to run a &loc* ofstatements a specific num&er of times.

For loops5 use a counter +aria&le #hose +alue increases ordecreases #ith each repetition of the loop

Dim !For ! 7 > To '8

A$ rocNext

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Looping Through Code

Using "or #e$t State!entsing the Step *e$#ord5 $ou can increase or decrease the

counter +aria&le &$ the +alue $ou specif$.

In the follo#ing e!ample5 the counter +aria&le isincremented &$ 2 each time the loop repeats.

When the loop is finished5 the total is the sum of 25 "5 (5 65and >8.

Dim 5 itotalFor 7 2 To >8 Step 2

itotal 7 itotal = NextAsg 7 The total is itotal

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Looping Through Code

Using "or #e$t State!ent4ou can e!it an$ For...Next statement &efore the counterreaches its end +alue &$ using the Exit For statement.

Because $ou usuall$ #ant to e!it onl$ in certainsituations5 such as #hen an error occurs5 $ou should use

the Exit For statement in the True statement &loc* of anIf...Then...Else statement.

If the condition is False 5 the loop runs as usual.

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Looping Through Code

Using "or %ach&&e$t State!entG For Each...Next loop is similar to a For...Next loop.

Instead of repeating the statements a specified

num&er of times5 a For Each...Next loop repeats agroup of statements for each item in a collection ofo& ects or for each element of an arra$.

This is especiall$ helpful if $ou don9t *no# ho#

man$ elements are in a collection.

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Looping Through Code

%$it State!entE!its a &loc* of Do...Loop 5 For...Next 5 Function 5 or Sub code.

Exit Do ro+ides a #a$ to e!it a Do...Loop statement.

It can &e used onl$ inside a Do...Loop statement.Exit For

ro+ides a #a$ to e!it a For loop.

It can &e used onl$ in a For...Next or For Each...Next loop.

Exit Function Immediatel$ e!its the Function procedure in #hich it appears.

Exit ropert! Immediatel$ e!its the ropert! procedure in #hich it appears.

Exit SubImmediatel$ e!its the Sub procedure in #hich it appears.

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'ractice set

Input parameters names are From and To

Gssume that &oth inputs are integers.

Displa$ in reporter all the pairs &et#een For and To

se the For... e!t loop.

Tip se the Step statement.

Concatenate to a temporar$ string.

Tr$ $our program for the follo#ing +alues

From 7 2 - To 7 >8 H25"5(565>8From 7 > - To 7 ? H25"5(56

From 7 J - To 7 3 HJ(5J"5J25852

From 7 '8 - To 7 "> H'85"65"(5""5"2

From 7 J3 - To 7 J? HJ"5J(5J6

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'ractice set

Input parameters names are s#d.

Declare a constant A4K GSSW;)D.

Declare a constant AG K)ET)4 7 3.

If the pass#ord is correct displa$ a mic ass message.

If the pass#ord is t$ped #rong more then AG K)ET)4times5 displa$ a micFail message.

se the Do..Loop HWhile or ntil .

Tip

se the E!it Loop statement.

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(a)e sure to *isit us

Tutorials

Grticles

ro ects

Gnd much more

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