aaaa: INTRODUCTION TO VBSCRIPT

VB Script

It is an Scripting Language

It’s uses and methods are slightly different from visual basic.

Used to develop Web Pages

It is used inside or with HTML tag.

VB Script & Java Script are two scripting language.

Differences Between Visual Basic & VB Script:

Both are developed by Microsoft Corporation.

VB can be called as scripting language used in Microsoft Excel.

VB Script is used with HTML language to design web pages.

Using VB we can develop efficient and useful softwares, but cannot be used in web pages.

Using VB Script we can design web pages but it cannot be used in VB

Using VB we can create or open a file.

But VB Script can be used for this.

VB Script is used by all Internet User.

VB is an institution or its branches and so on used programs.

VB Script avoids confusion in Computer’s memory because it does not save the file in Computer’s memory.

It can be alone in VB.

Using VB Script we cannot run DLL (Dynamic Link Library) and .exe files.

Using VB we can run DLL and exe files.

Using VB Script we can also run Java Applet and ActiveX Control but VB cannot run these.

Reason:

VB Script is used in web pages. Since it is used by all kinds of people there may be any damages can be done to your computers by other users. For this there is need to avoid certain things like DLL in VB Script.

HTML - Static Language

VB Script – Static language to change the HTML is DHTML we use the scripts.

Script is first used for validation.

Script:

A script is a particular syntax used to execute commands of a computer.

Programming composed for components from a particular scripting language is referred to as a script.

Web Server:

IIS - Internet Infromation Server

PWS - Personal Web Server

JWS - Java Web Server

Editor - Notepad, Dos Editor, Ms-Word

Notepad is largely used.

VB Script should be inserted inside the body tag.

<body>

Prog:

<html>

<head>

<title> VB Script Example </title>

</head>

<body>

“Welcome to my first vbscript program”

</script>

</body>

</html>

</script> àend tag

2. Basic Components for Writing VB Script Program:

1. Program is made up of several statements.

2. Statemnts are made up of commands

Commands à Keys to order computer.

Eg. LET, PRINT, END

Some other components are

1. Variable

2. Constant

3. Operators

4. Commands & Statements

5. Functions

Variable:

Datas are structural and functional unit of a program.

Data cannot be used directly it should be stored in a variable.

A = 10

Variable Constant

Variable – value can change at any time.

Constant – Doesnot change.

Variable A = 10 Constant

A = 200

A = 30

Variable are used to store the values in the harddisk (storage location) and are helpful in writing a program.

Variable length can range upto 255 characters.

Average age of the student = 20

Variable length = 22

Eg:

Average age of the student – avgagestu

Note:

First letter should not be a number

It should be an alphabet

1avg = 20 à Wrong

a1 = 10 à Right

1a = 10 à Wrong

We can use underscore

Avg _ age _ stu àright

Avg – age- stu à wrong dot is not allowed

Avg age stu à Space also not allowed

Variable Type:

In VB Script there is only one variable type

Ie. Variant type

Variant type depends on the data type.

Data Type Description

1. Integer 1567

2. Long 157897

3. Byte Contains Binary Digits

eg. 10110 (Range 0 to255)

4. Single Floating – point number

(decimal upto 4 digits)

eg. 1.567

5. Double Floating point having

more than 4 digits

eg. 1.567897

6. Date Contains no’s that

represent date

eg. December 31, 9999

7. String Store numbers&characters

(upto 2 billion characters

in length contains objects

8. Object Contains Objects

9. Error Contains error number

In order to find datatype we can use the function typename.

A=10

Type name (a)

Msgbox typename(a)

Default typename is double à For decimal numbers

Default typename is Integer à For binary numbers

Default typename is Date à For string

<html>

<head>

<title> CSC private Ltd</title>

<body>

a=200

msgbox typename(a)

a=4858943

msgbox typename(a)

a=200.5

msgbox typename(a)

a=1.1

msgbox typename(csng(a))

a=”compcare”

msgbox typename(a)

c=true

msgbox typename( c )

d=1

msgbox typename(cbyte(d))

y=”2/2/90”

msgbox typename(datevalue(y))

dim p

msgbox typename(p)

k=null

msgbox typename(k)

</script>

</body>

</html>

Dim p = Result Empty

K =NULL =Result NULL

Checking the variable type

1. isarray() Checks whether the given one is

array or not

2. isdate() Checks whethers the given one is

date or not

3. isempty() Checks whether the given one is

empty or not

4. iserror() Checks whether the given variable is error or not

5. isnumeric() Given variable Is numeric or not

<html>

<head>

<title> CSC private Ltd </title?

</head>

<body>

a=200

if(isnumeric(a)) then

msgbox (“The variable holds numeric value …”)

else

msgbox (“The variable does not hold numeric value …”)

end if

msgbox “The variable type is…”&typename(a)

b=”compcare”

if(isnumeric(b)) then

msgbox (“The variable holds numeric value …”)

else

msgbox (“The variable does not holds numeric value …”)

end if

msgbox “The variable type is …” & typename(b)

</script>

</body>

</html>

Note:

If (condition) then

Statement à True

Else

Statement à False

Convertion Function:

Eg:

A = “200”

B = “700”

C=a+b

C=”200” + “700”

C=cint(a) + b

C=200 + 700

C=900

1. Asc() Gives ASCII value for a character

2. Chr() Gives character for a ASCII code given

3. CBool() Gives corresponding boolean value

4. CByte() Gives byte value

5. CDate() Returns datevalue for corresponding value

6. CDbl() Gives corresponding double value

7. CInt() Gives integer value

8. CLng() Will return long integer value

9. CSng() Will return single value

10. CStr() Converts given one into string

11. CvErr() Gives Error

12. Sgn() Gives sign value

13. Str() Gives string value

14. Val() String number

15. Date Value() String date value

16. Time Value() String time value

17. Fix() Decimal – whole number part only

18. Int() Decimal – Integer

<html>

<head>

<title> CSC private Ltd </title>

</head>

<body>

a=67

document.write “The given ascii code is … &a

document.write “<br>”

document.write “The corresponding character is …”&chr(a)

document.write ”<br>”

b=”A”

document.write “The given character is …” &b

document.write “<br>”

document.write “The corresponding ascii value is … & asc(b)

document.write “<br>”

c =+ 12

document.write “The given number is …. &c

document.write “<br>”

document.write “The corresponding boolean character is … & cbool ( c )

document.write “<br>”

c=0

document.write “The given no is … “ &c

document.write “<br>”

document.write “The corresponding boolean character is …” & cbool ( c )

document.write “<br>”

d=-8.65

document.write “The given no is … “ &d

document.write “<br>”

document.write “The corresponding fix value is … “ &fix(d)

document.write “<br>”

document.write “The corresponding int value is … “ &int(d)

document.write “<br>”

d= “12/01/03”

document.write “The given number is … &d

document.write “<br>”

document.write “The corresponding date value is … & datevalue(d)

document.write “<br>”

d= “11:40:30”

document.write “The given no is …”&d

document.write “<br>”

document.write “The corresponding time value is …” &timevalue(d)

document.write “<br>”

d= -90

document.write “The given no is …” &d

document.write “<br>”

document.write “The corresponding sign value is …”&sgn(d)

document.write “<br>”

</script>

</body>

</html>

Constant

Values doesnot change at any instant

There are number of constants.

A=10 -> Integer Constant

B=1.1 -> Floating Constant

C=”Compare” -> String Constant

Operators

Used for some calculation

It joins the operands

Operators

C=a+10-3/2 Expression

Operands

Operands may be a variable or constants

Operands + Operators -> Expressions

When expression is made to match with a variable then it is called statements

Classifications of operators:

1. Arithmetic Operator

2. Comparison Operator

3. Logical Operator

Arithmetic Operators:

+ = Addition

- = Subtraction

* = Multiplication

/ = Decimal division

\ = Integer division

^ = Exponentation (power)

mod = Remainder

& = Concatenation (Joins two strings)

Comparison Operator:

Used to compare two operands

= = Equal to

< > = In Equality

< = Less than

> = Greater than

<= = Less than or equal to

>= = Greater than or equal to

is = Objective equivalence

(Compare two objects)

eg:

if (100 > 20) then

if (a=b) then

Logical Operator:

We use relational operators to compare two operands logical operators are used to compare more than two operands.

Eg:

100 > 20 AND 10 > 3

Operator Description/Use

NOT Negation

AND Logical AND

OR Logical OR

XOR Exclusive OR

Equ Equivalence

Imp Implies

And:

If all the condition is true then the result is also true.

If any one condition is false then the result is also false.

Eg:

If (100>20) AND (100<5) Then

True and false = false

If(200 > 100) AND (200>20) then

True and True = True

And Operator

First Expression Second Expression Third Expres

True True True

True False False

False True False

False False False

Or Operator

If any one of the given expression is true then whole expression is said to be true

Eg:

If (100>20) or (100>300) then

True or false = true

The table for or operators

First Expression Second Expression Third Expres

True True True

True False True

False True True

False False False

Not Operator

If the given expression is true result is false and if the given expression is false result is true

Eg:

If(not(age<40) then

Expresion Result

True False

False True

Function:

The functions can be classified as

1. Date and time function

2. Numeric function

3. String function

Date and Time Functions:

1. Date() 6. Time()

2. Day() 7. Minute()

3. Month() 8. Hour()

4. Year() 9. Second()

5. Weekday() 10. Now()

<html>

<head>

<title> Time Program </title>

</head>

<body>

document.write “Current date is…” &date()

document.write “<br>”

document.write “Current day is…” &day(date())

document.write “<br>”

document.write “Current month is…” &month(date())

document.write “<br>”

document.write “Current year is …”&year(date())

document.write “<br>”

document.write “Current week day is …” &weekday(date())

document.write “<br>”

document.write “Current time is …”&time()

document.write “<br>”

document.write “Current minute is …” &minute(time())

document.write “<br>”

document.write “Current hour is…” &hour(time())

document.write “<br>”

document.write “Day of the given date 11/12/90 …” & day(datevalue(“11/12/90”))

document.write “<br>”

document.write “Second of the given time 10:12:45 is …” & second (time value(“10:12:45”)

</script>

</body>

</html>

Function Description / Uses

Date() Returns current date

Time() Returns current time

Now() Returns current date and time

Datevalue string date to date

Weekday weekly

10/2/2000 10 – month 2 – date 2000 – year

10:20:30 10 – hour 20 - minute 30 – second

Numeric Functions:

They are

1. abs()

absolute value

negative -> positive

eg: y=abs(-45)

y=45

2. sgn() => gives the sign value

eg: y=sgn(4) p=sign(-4)

y=1 p=-1

3. Sqr()

Square root function

P= sqr(4)

P=2

4. Fix()

Gives only the whole number value leaves the decimal

Y=fix(11.56)

Y=11

5. Int() Integer

It rounds the decimal places

Eg: y=int(11.89) x=int(11.30)

X=12 x=11

6. exp() Power function

x=exp(2)

x=7.3890

7. log() function

gives log value

y=log(5)

y=1.6094

8. Rnd

Gives a decimal no inbetwen 0 and 1

X=rnd()

X=0.00718

If RND is used another time it gives new value

eg: 0.01793

9. sin() sine

gives the sine value

y=sin(0)

y=0

10. cos() function

gives cosine value

y=cos(0)

y=1

11. atn() arc tangent value

y=atn(0)

y=1

12. tan() givens tangent value

y=tan(0)

y=1

<html>

<head>

<title> Numeric function</title>

</head>

<body>

document.write “Absolute value of -45 is … “&

abs(-45)

document.write “<br>”

document.write “Sign value of -4 is … & sgn (-4)

document.write “<br>”

x=-9.67

document.write “Fix of -9.67 is …” &fix(x)

document.write “<br>”

document.write “Square root of 16 is …” &sqr(16)

document.write “<br>”

document.write “Random no is …”&rnd()

document.write “<br>”

document.write “Sine value of 0 os … &sin(0)

document.write “<br>”

document.write “Exponential of 2 is …” &exp(2)

document.write “<br>”

</script>

</body>

</html>

String Function

Used to handle characters

1. Asc

gives ASCII value

y = “c”

x=asc(y)

=99

A = 65 a = 97

Z = 90 z = 122

2. Chr() function

Changes ASCII code to character

b = chr(98)

B = b

3. Len() function

It calculates the length of the given string i.e. no of letters in the given string.

X=len(“compare”)

X=8

4. Val() function

Changes character to value for the doing calculation

P = “123”

Y = val(p)

Y = 123 “123” à 123

String Value

5. Lcase() function

Changes the given characters into small letters (Lower Case Letters)

Y = “COMPARE”

P = lcase(y)

=compare

6. Ucase() function

Changes the given characters into capital letter (upper case letters)

P = “compare”

Y = Ucase(p)

=COMPCARE

7. Left() function

It returns characters from the left – hand side of string

Y = “COMPCARE”

P=left(y,3)

=com

First argument is the string from which you are returning characters

Length is the number of characters to return

8. Right() function

p = “COMPARE”

q = right (p,3)

=ARE

9. Mid() function

It returns characters from any part of a string

P = “COMPCARE”

Q = mid (p,3,2)

=MP

10. Mid (p,3,2)

11. Trim() function

y = “ Compare “

x=trim(y)

= compare

12. Ltrim() function

y = “ Compare”

p=ltrim(y)

f=len(p)

f=8

13. Rtrim() function

y = “compare “

p=rtrim(y)

x=len(p)

x=8

14. Str() function

number à string

y=123

p=str(y)

p=”123”

15. String() function

Repeat string upto length specified

Y=string (3, ‘a’)

= aaa

16. Strcomp() function

strcomp (“cat”, “ate”) or strcomp(“cat”, “ant”)

99 - 92

cat>ant

Compaison is based on ascii value

<html>

<head>

<title> String function </title>

</head>

<body>

document.write “ltrim of string is …”&ltrim

(“ Compare”)

document.write “<br>”

if(strcomp(“comp”,”apple”)>0 then

document.write “The first string is big …”

else if(strcomp(“comp”,”apple”)<0 then

document.write “The second string is big …. &”apple”

else if(strcomp(“comp”,”apple”)=0 then

document.write “Both the strings are equal”

endif

</script>

</body>

</html>

Statements

There are two types of statement in vbscript

1. Branching Statements

2. Looping Statements

To input data – inputbox

To get data – outputbox

Inputbox can divided into three

1. Title of the input box

2. Prompt message

3. Default text

Title of the input box gives title

Prompt message – what do to type in the input box

Default text – value getting place

Syntax:

Inputbox (prompt [,[title][,default]])

Inputbox (“Enter your name”, “sample inputbox” “type the name here”)

Prompt is more important in inputbox

Other two are default type

<html>

<head>

<title> Sample inputbox </title>

</head>

<body>

y=inputbox(“Enter your name…”,”sample inputbox”,”Type the name here …”)

docucment.write “The given name ius … “&y

</script>

</body>

</html>

Message box:

It displays the result

Syntax

Msgbox(msg,[[type],[title]])

Msg – place to give message

Title – gives heading for the message box

Type – it determines the type of buttons and no of buttons

Function	Description / Uses
0 1 2 3 4 5	Ok button Ok and cancel buttons Abort, Retry and Ignore buttons Yes, No and Cancel buttons Yes, No buttons Retry and Cancel Button

Eg:

Msgbox (“The name is”, 0, “Sample msgbox”)

Msgbox (“The name is”, 1, “Sample msgbox”)

Msgbox (“The name is”, 3, “Sample msgbox”)

Msgbox (“The name is”, 5, “Sample msgbox”)

Before the message in message box we can insert some special mark

Number	Special Symbols
16 32 48 64	Stop Icon Question Icon Exclamation Icon Information Icon

Eg:

Msgbox (“The name is”, 0+16, “sample message box”)

Msgbox (“The name is”, 0+48, “sample message box”)

Msgbox (“The name is”, 0+64, “sample message box”)

Sample message box:

Msgbox (“Entitled name is …”)

Eg:

<html>

<head>

<title>Sample message boxes </title>

</head>

<body>

msgbox (“The name is …”, 3, “sample msgbox”)

msgbox (“The name is …”, 0+48, “sample msgbox”)

</script>

</body>

</html>

Uses of message box:

If msgbox value is getted in a variable then we can do lot of calculation using them.

Eg:

OK button – 1

Cancel button – 2

Code	Button
1 2 3 4 5 6 7	OK Cancel Abort Retry Ignore Yes No

<html>

<head>

<title>Msgbox calculation</title>

</head>

<body>

a=inputbox (“Enter the first no …”,”sample program”,”type the first no here”)

b=inputbox(“Enter the second no …”,”sample program:,”type the secod no here”)

ans=msgbox(“The resultant value is … [press yes to find addition] [press no to find subtraction]”, 4, “output”]

if (ans=6) then

c=int(a) + int(b)

document.write “The addition is …” &c

else if(ans=7) then

c=int(a) – int(b)

document.write “The subtraction is …”&c

endif

</script>

</body>

</html>

1. Branching statements

2. Looping statenebts

Branching:

If the given condition is satisfied it runs some statements if not it runs other.

There are about three types

1. Simple if then else

2. Else if ladder

3. Nested if else

Simple if:

It checks only one condition if it is true, the statements after then will be executed.

Syntax:

If (condition1) then

Statements

Else

Statements

Endif

Statements

<html>

<head>

<title>Compcare software Limited</title>

</head>

<body>

a=inputbox (“Enter a no …”,”Simple if program”, “Type the no here”)

if(a>0)then

document.write “The given no is positive …”&a

else

document.write “The given no is negative …”&a

endif

</script>

</body>

</html>

else if ladder

More than one statement will be executed.

Syntax:

If(coondition1)then

Statements

Else if(condition2) then

Statements

Else if(condition3) then

Statements

Endif

If condition1 is true the statement after then will be executed if it is false the statement after elseif will be executed like this it goes on.

<html>

<head>

<title> else if ladder program </title>

</head>

<body>

name=inputbox (“Enter the name …”,”elseif ladder program”,”Enter the name here …”)

code=inputbox (“Enter the roll no …”,elseif ladder program”, Enter the rollno here …”)

mark1=inputbox(“Enter the mark1 …”, elseif ladder

program, “Enter the mark1 here …”)

mark2=inputbox(“Enter the mark2 …”, elseif ladder

program, “Enter the mark2 here …”)

tot = mark1+mark2

avg = tot/2

if(avg>=80 and avg<=100) then

g=”excellent”

else if(avg>=60 and avg<80) then

g=”very good”

else if(avg<=600)then

g=”good”

endif

document.write “The name of the student is …”&name

document.write “The code of the student is …”&code

document.write “Total is …”&tot

document.write “The average is… “&avg

document.write “The grade is …”&g

</script>

</body>

</html>

Nested if else

Compound if statement

Syntax:

If(condition 1)then

If(condition 2)then

Statements

Else

Statements

Endif

Else if(condition 3)then

If(condition 2)then

Statements

Else

Statements

Endif

Looping statements

1. Do.. while

2. Do.. Until

3. While.. Wend

4. For.. Next

The basic for these looping structure

1. Intial value

2. Final value

3. Condition Checking

4. Increment or Decremnt

1. Do.. While

It executes as long as the condition (remains) becomes false

Syntax:

Initial value

Dowhile <condition>

Statements

Increment/decrement

Loop

Statements

<html>

<body>

f=1

i=1

do while(i<=3)

f=f*i

i=i+1

loop

document.write “The factorial value of 3 is…” &f

</script>

</body>

</html>

Initial value =1

Initial value = 3

2. Do..Until:

It executes as long as condition becomes true

Syntax:

Intial value

Do until <condition>

Statements

Increment/decrement

Loop

Statements

If the condition false it will run

<html>

<body>

i=1

do until(i>3)

document.write “Murali” &”<br>”

i=i+1

loop

</script>

</body>

</html>

3. While..Wend:

It is similar to dowhile. It executes or run the program until the condition becomes false using this we can design and run some statements according to our needs.

Syntax:

While<condition>

Statements

Increment/decrement

Wend

Statements

<html>

<body>

s=0

i=1

while(i<=3)

s=s+i

i=i+1

wend

document.write “The sum of the series is …”&s&”<br>”

</script>

</body>

</html>

4. For..Next:

The for statements is one of the most commonly used loop. The statement include expression that specifies an initial value for an index, another expression that determines whether the loop is to be executed or not

1. Initial value

2. Final value

Syntax:

For variable = initial value to final value step step value

Statements

Nest

Statements

If step value is positive – the value of the variable increases

If step value is negative – the value of the variable decreases

<html>

<body>

for i=2 to 6 step 2

document.write I &”<br>”

</script>

</body>

</html>

Forward and backward loop:

If initial value is les than that of final value and if the value of the variable increases it is said to forward loop.

If initial value is greater than that of final value and if variable value decreases inside the loop that is said to be backward loop.

Increment loop:

I=1

While(i<=5)

Document.write i&”<br>”

I=i+1

Wend

Decrement loop:

I=5

Dowhile (i>=1)

Document.write i&”<br>”

I=i-1

Loop

I=i+1 – forward loop

I=i-1 – backward loop

Forward:

I=1

Dowhile(I<=3)

I=i+1

Loop

I=1

While(i<=3)

I=i+1

Wend

I=1

Dountil(i>=3)

I=i+1

Loop

For i=1 to 3 step 3

Backward:

I=3

Dowhile(I>=1)

I=i-1

Loop

I=1

While(i>=1)

I=i-1

Wend

I=1

Dountil(i<=1)

I=i-1

Loop

For i=3 to 1 step -1

Select Case

Using this we can select a particular item and run program on the basic of it.

Syntax:

Select case <variable>

Case value1

Statements

Case value2

Statements

Case else

Statement

End select

Statements

<html>

<body>

a1=10

b1=20

ch=inputbox(“Enter the choice: type a for +, s for -, m for *, d for /”)

select case ch

case “a”

c=a1+b1

case “s”

c=a1-b1

case “m”

c=a1*b1

case else

c=a1/b1

end select

document.write “The solution is…”&c

</script>

</body>

</html>

Function & procedure

Using these we can split a large programs into a sampler one so that we can understand easily and also we can find out errors in our program.

Procedure:

Syntax:

Sub<procedure name(arguments)>

Statements

End sub

Call<procedure name(arguments)>

Option explicit for all of the variables used in vb declared explicitly

1. Sub should be ended with endsub

2. A name has to be given to the procedure eg. Sub adition

3. Arguments – variables

If values impressed from the main program to the procedures it can be stored in the arguments. It is not necessary at all times.

if more than one value is passed from main program to procedures we have to give use this

sub addition(a,b)

sub is used to declare a statement that form a subroutine.

If no arguments are passed

End sub confirms the ending

Procedures should be called

Call addition(a,b) or call addition()

This is the main part of the program

The no. of values passed from main program to procedure should be same.

Eg:

Call addition (a,b,c)

Sub addition (a,b,c)

Sub addition (a,b)

The program doesnot run properly

Call addition (a,b)

Sub addition (x,y)

C=x+y

End sub

Function:

1. It is used to minimize the repetition work .

2. Used to declare a set of statements that formed the body of function.

Statements:

There are 7 types of statements

1.Call statement:

It transfers control to subroutines or function

Syntax:

Eg:

Call <function name>

Call sum

2. const:

It declares a constant that can be used in place of literal (constant) value

Syntax:

Const <variable name> = expression

A=10

3. Dim:

It declares the variables and allocate the memory

Syntax:

Dim variable name[[upperbound],[lowerbound]] array

Dim <var name>

Eg:

Dim a

Dim arr(8,2)

4. Set statement:

This is used to assign an object reference to variable of property

5. Option Explicit

7. Su. Function b

Function:

Syntax:

Variable = <function name(arguments)>

Function <function name(argument)>

Statements

Function name=resultant variable

End function

Function program should be between function end function

Give name to the function

Eg. Function fact()

Arguments can be passed if more than one argument is passed, they should be separated by commas

Function fact(a,b)

Function program should be given between <function name (argument)> and end function

It should be called before or after the written function program

Variable = function name(arguments)

Eg. Y=fact(n) -> main program

If value is passed to function from main program we have call like this

Y=fact(n)

If no value is passed

Y=fact()

<html>

<body>

c=summation()

document.write “The addition is …”&c&”<br>”

-------------------------

function summation()

a1=inputbox(“Enter the first no…”)

b1=inputbox(“Enter the second no…”)

summation = int(a1)+int(b1)

endfunction

</script>

</body>

</html>

<html>

<body>

a1=inputbox(“Enter the first no…”)

a2=inputbox(“Enter the second no…”)

c=addition(a1,b1)

d=multiplication(a1,b1)

document.write ”Addition is…”&c&”<br>”

document.write “Multiplication is…”&d&”<br>”

function addition()

addition = int(a1)+int(b1)

end function

function multiplication()

multiplication = int(a1)*int(b1)

end function

</script>

</body>

</html>

Arrays and Matrix:

Using looping structure we can minimize the no of variables in a program but variables does not have values at all places.

Without looping structures we have to use 100 variables for input 100 numbers.

To avoid these two difficulties arrays are used.

Arrays means storing large or more datas in a single memory space

A1 a2 a3 a4 a5

5 10 13 14 17

A(0)	A(1)	A(2)	A(3)	A(4)
5	10	13	14	17

Here a(0), a(1), a(2), a(3) &(4) are array elements

Array elements stored in memory sequentially

Array elements are considered as a single variable

If we give a(5)

A array allots five memory spaces

First element in array is (subscript) 0

Serial no for last element is (subscript) 4

It is an one dimensional array

Two dimensional arrays:

5	3	2
7	5	8
5	6	7

A(3,3)

3-rows

3-columns

A(0,0)	A(0,1)	A(0,2)
A(1,0)	A(1,1)	A(1,2)
A(2,0)	A(2,1)	A(2,2)

<html>

<body>

dim itemarray(3)

item array(0)=”bread”

item array(1)=”cakes”

item array(2)=”honey”

item array(3)=”biscuits”

msgbox “The value of the counter is “&itemarray(2)

</script>

</body>

</html>

<html>

<body>

my array(1,0)=”juliat”

my array(1,1)=94

my array(2,0)=”raju”

my array(2,1)=39

my array(3,0)=”ganesh”

my array(3,1)=67

msgbox “The code of “&my array(3,0)&”is”&my array(3,1)

</script>

</body>

</html>

increasing array elements

dim itemarray()

redim itemarray(4)

item array(3)=”choclates”

msgbox itemarray(3)

redim itemarray(6)

msgbox itemarray(6)

</script>

</body>

</html>

Redim is used to increase the size of array element.

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Sunday 1 March 2015

INTRODUCTION TO VBSCRIPT

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