1. VB Script

2. • VBScript stands for Visual Basic Scripting, is a scripting
language was launched by Microsoft in1996.
VB Scripting language is a lightweight programming
language.
VBScript can be used to write both client-side and
server-side scripting.

3. • VBScript supports only one Data type called ‘Variant’
•A Variant is a special type of data that can contain
different kinds of information, depending upon how it is
used.
•A variant behaves as a number when it is used in a
numeric context and as a string when used in string
context.

4. VBScript Variables
A variable is a "container" /Placeholder that refers to a memory
location,that stores program information that may change at
run time.
Variable Declaration:
Dim :Variable declared with Dim at script level are available
To all procedures within the script.
Public: Variables are available to all procedures in all scripts.
Private: Variables are available only to the scripts in which they
are declared.

5. Naming Rules:
 Must begin with an alphabetic character
 Cannot contain an embedded period
 Cannot exceed 255 characters
 Must be unique within its scope in which it is declared.
Implicit Declaration:
 You can Assign a Value to variable directly (without declaring a
variable). But not a good practice, because you may misspell the
variable name in one or more places, causing unexpected result
when your script is run.
Example:
Dim var_ x
var_x=1

6. Constants
 The values that do not alter during the entire
execution of the program are called as constants.
 Const keyword is used to declare constants.
 It is necessary to initialize the Constant during its
declaration.
 You cannot change the value of constants in later
script.
Syntax:
const x=1
const my string=“This is my string”

7. Arrays
 A Variable containing single value is called scalar
variable.
 Sometimes you want to assign more than one value to
a single variable. Then you can create a variable that
can contain a series of values. This is called an array
variable.

8. Arrays (cont.)
 The declaration of an array variable uses parentheses ( )
following the variable name.
Example:
dim names(2)
names(0)=“Ali“
names(1)=“Imran“
names(2)=“Khan"

9. Arrays (cont.)
 An array can be multi dimensional.
 There can be 60 (maximum) dimensions in an array.
 Multiple dimensions are declared by separating the
numbers in the parentheses with commas.

10. Procedures
A Sub procedure:
 is a series of statements, enclosed by the Sub and End
Sub statements
 can perform actions, but does not return a value
 can take arguments that are passed to it by a calling
procedure
 without arguments, must include an empty set of
parentheses ()

11. Procedures (Cont)
 Sub Keyword is Used to declare a procedure.
 End Sub Keyword is Used to defining the ending
boundary of a procedure.
 Call Keyword is Used in order to invoke a procedure.
Syntax:
Sub mysub()
some statements
End Sub
Call mysub()

12. Procedures (Cont)
 Procedure can take arguments that are passed to it by
calling that procedure .
Syntax:
Sub procedure name(arg1,arg2)
some statements
End Sub
Call mysub(value1,value2)

13. Functions
A Function procedure:
 is a series of statements, enclosed by the Function and
End Function statements
 can perform actions and can return a value
 can take arguments that are passed to it by a calling
procedure
 without arguments, must include an empty set of
parentheses ()
 returns a value by assigning a value to its name

14. Functions (Cont)
 Function Keyword is Used to declare a Function.
 End Function Keyword is Used to defining the ending
boundary of a Function.
 <Function Name> is Used in order to invoke a Function.
Syntax:
Function myfunc()
myfunc=value
some statements
End Function
myfunc

15. If Condition
 Using If statement we can execute a single or block of
statements when a condition
is true.
 Ex:-
If i=0 Then
msgbox "Hello"
i=i+1
End If

16. If-Else Condition
Execute a block of statement when condition is true,
otherwise execute another block of statements when
condition false.
If i=2 then
msgbox”Hello world”
Else
Msgbox”Thank You”
End if

17. If-Elseif Condition (cont.)
 Decide among several alternates.
 if payment="Cash" then
 msgbox "You are going to pay cash!"
 elseif payment="Visa" then
 msgbox "You are going to pay with visa."
 elseif payment="AmEx" then
 msgbox "You are going to pay with American Express." else
 msgbox "Unknown method of payment.“
 end If

18. Select Case Condition
 Using this statement one of several groups of statements
are executed based on the expression value. Example: You
can use the SELECT statement if you want to select one of
many blocks of code to execute.
Select case payment
Case " Cash "
msgbox " You are going to pay cash "
Case " Visa "
msgbox " You are going to pay with Visa "
Case " AmEx"
msgbox " You are going to pay with American Express"
Case Else
msgbox " Unknown method of payment"
End Select

19. For Loop
A For loop is used for situations when you need to do
something over and over again until some condition
statement fails.
Ex:-
For count=0 to 3
Print (count)
Next

20. For Each Loop
 It is useful when you want to go through every element
in an array but you do not know how many elements
are there inside the array.
 Ex:-
Dim a(2)
a(0)= " Pen "
a(1) =" Register"
a(2)= " Copy"
For Each item In a
Print(item)
Next

21. Do-while loop
 Do-while keywords are used to execute specified code
for a set of times (until a condition remains true or a
condition becomes false).
 Syntax
Do While <Condition for loop>
Some Statements
Loop

22. Do-while loop (cont.)
 Do-While can also used in following syntax:
Do
some Statements
Loop While i>10

23. Do-Until Loop
 Do – Until keyword is used for repeating some set of
statements until a certain condition is true.
 Syntax:
Do Until <Condition>
some statmemts
Loop

24. Do-Until Loop (cont.)
 Do-Until can also used in following syntax:
Do
some statements
Loop Until <Condition>

25. Built in Functions
 VB Script provides several built in functions that can
be used just by calling them.
 Few Examples:
 Date
 Time
 Int