# UFT Class 23

# UFT Class 23

### (VBScript variables, Operators-1)

#### III) VBScript Variables

#### 1) What is Variable?

A named memory location to store the data.

Two types of Memory in Computer Environment:

i) Primary Memory – RAM

ii) Secondary Memory – HDD, DVD, USB drives etc…

#### 2) Declaration of Variables

Variables can be declared using either Public or Private or Dim statements.

How to declare:

Syntax:

Dim VariableName

Or

Dim Variable1Name, Variable2Name, Variable3

Ex:

Dim a

Or

Dim a, b, c

#### 3) Implicit and Explicit declaration of Variables

**Ex:**

Dim a

a = 100 ‘Explicit Variable

b = 200 ‘Implicit Variable

Msgbox a + b

——————–

Dim Tickets, Price, Total

Tickets = 7

Price = 100

Total = Tickets * Priee ‘Problem with Implicit variables

Msgbox Total

—————————–

Option Explicit ‘It forces declaration of all variables

Dim Tickets, Price, Total

Tickets = 7

Price = 100

Total = Tickets * Priee ‘Problem with Implicit variables

Msgbox Total

#### 4) Assigning values to Variables

Two types

i) Initialization

**Ex:**

a = 100

ii) Reading

from Input devices

from files (Text, Excel)

from databases

from Application Objects

**Ex:**

Dim num1, num2

num1 = 100 ‘Initialization

num2 = InputBox(“Enter Num2 Value”) ‘Reading

Msgbox “Addition of num1, num2 is: ” & num1 + num2

#### 5) Usage of variables

Dim a, b

a = 100 ‘Holding the Data

a = 10 ^ 3 ‘Storing the data that return by a program

Msgbox a

a = Date ‘Storing the data that return by a Function

Msgbox a

‘Storing Object reference

Set a = CreateObject(“Scripting.FileSystemObject”)

Msgbox VarType(a) ‘9 for Automation Object

‘As Parameter

For b = 1 To 5 Step 1

Window(“Flight Reservation”).Activate

Window(“Flight Reservation”).WinButton(“Button”).Click

Window(“Flight Reservation”).Dialog(“Open Order”).WinCheckBox(“Order No.”).Set “ON” Window(“Flight Reservation”).Dialog(“Open Order”).WinEdit(“Edit”).Set b ‘b is parameter

Wait 2

Window(“Flight Reservation”).Dialog(“Open Order”).WinButton(“OK”).Click

Next

#### 6) Variable Naming Restrictions

i) Variable names should start with Alfa bytes

**Ex:**

Dim abc ‘Correct

Dim ab7 ‘Correct

Dim 7bc ‘Incorrect

ii) Variable cannot contain embedded periods

**Ex:**

Dim abc ‘Correct

Dim ab c ‘Incorrect

Dim ab-c ‘Incorrect

Dim ab*c ‘Incorrect

Dim ab.c ‘Incorrect

Dim ab_c ‘Correct

iii) Variable names must not exceed 255 characters

iv) Must be unique in the scope of declaration

Dim a, b, c ‘Correct

Dim d, e, f ‘Correct

Dim g, h, A ‘Incorrect

v) Should not use reserved words as variable names

**Ex:**

Dim For, While

#### 7) Scope of Variables

i) Script Level Variables (It can be used for entire script)

ii) Procedure / Function Level Variables (It can be used within the Function only)

**Ex:**

Dim a, b, c ‘Script Level Variables

a = 10

b = 20

c = a + b

Msgbox c ’30 (10 + 20)

Function xyz()

Dim d, e ‘Function Level variables

d = 50

e = a + d

Msgbox e

End Function

Call xyz ’60 (10 + 50)

Dim f, g ‘Script Level Variables

f = 70

g = b + d + f

Msgbox g ’90 (20 + 0 + 70)

—————————-

Option Explicit

Dim a, b, c ‘Script Level Variables

a = 10

b = 20

c = a + b

Msgbox c ’30 (10 + 20)

Function xyz()

Dim d, e ‘Function Level variables

d = 50

e = a + d

Msgbox e

End Function

Call xyz ’60 (10 + 50)

Dim f, g ‘Script Level Variables

f = 70

g = b + d + f

Msgbox g ‘Error

#### 8) Types of Variables

i) Scalar Variables (To store single value)

ii) Array variables (To store series of values at a time based on size of the Array)

Note: VBScript Arrays having Zero based index.

#### 9) Declaration of Arrays

Syntax:

Dim ArrayVariblename (size in number)

**Ex:**

Dim a (3) ‘ we can store four values

———–

**Ex 2:**

Dim a(3), b

a(0) = 10

a(1) = 20

a(2) = 30

a(3) = 40

b = a(1) + a(2)

Msgbox b ’50

———————

Dim a(3), b

a(0) = 10

a(1) = 20

a(2) = 30

a(3) = “abc”

b = a(1) + a(2)

Msgbox b ’50

Note: we can assign different types of data also.

———————————-

Dim a(3), b

a(0) = 10

a(1) = 20

a(2) = 30

a(3) = 40

a(4) = 50 ‘Error (Subscript Out of range)

b = a(1) + a(2)

Msgbox b ’50

#### 10) Dynamic and Dimensional Arrays

Dynamic Array:

**Ex:**

Dim a, b(3), c()

ReDim c(2)

c(0) = 10

c(1) = 20

c(2) = 30

a = c(0) + c(2)

Msgbox a ’40

ReDim c(4)

c(3) = 40

c(4) = 50

a = c(2) + c(4)

Msgbox a ’50

————————

Preserve Keyword:

Dim a, b(3), c()

ReDim c(2)

c(0) = 10

c(1) = 20

c(2) = 30

a = c(0) + c(2)

Msgbox a ’40

ReDim Preserve c(4)

c(3) = 40

c(4) = 50

a = c(2) + c(4)

Msgbox a ’80

————————

Dimensional Arrays

**Ex:**

Dim a, b(4), c(), d(4, 5)

d(0, 0) =”UFT”

#### 11) Assigning Series of values to Array variables

i) Using Array Function

**Ex:**

Dim a

Msgbox IsArray(a)’False

a = Array(100, 200, 300, “India”, 1.22, #10/10/2010#)

Msgbox IsArray(a) ‘True

Msgbox a(1) ‘200

Msgbox a(3) ‘India

Msgbox UBound(a) ‘5

ii) using Split Function

**Ex:**

Dim a, b

a = “VB Script Language”

Msgbox IsArray(b) ‘False

b = Split(a)

Msgbox IsArray(b) ‘True

Msgbox b(1) ‘Script

Msgbox UBound(b) ‘2

————————-

Dim a, b

a = “VB@Script@Language”

Msgbox IsArray(b) ‘False

b = Split(a, “@”)

Msgbox IsArray(b) ‘True

Msgbox b(1) ‘Script

Msgbox UBound(b) ‘2

————————–

Dim a, b

a = “VB@$%Script@$%Language”

Msgbox IsArray(b) ‘False

b = Split(a, “@$%”)

Msgbox IsArray(b) ‘True

Msgbox b(1) ‘Script

Msgbox UBound(b) ‘2

#### IV) VBScript Operators

Operators are used to perform mathematical, comparison and logical operations.

#### Operator precedence:

It is Operator evolution process, generally VBScript evaluates operators from left to right.

But any high priority operator is there in right side, VBScript first evaluate high priority operator then general rule.

**Ex:**

Msgbox 10 + 4 * 2 ’18

Msgbox (10 + 4) * 2 ’28

#### Categories of Operators:

i) Arithmetic Operators

ii) Comparison Operators

iii) Logical Operators

———————

Concatenation operators (* Part of Arithmetic Operators)

#### i) Arithmetic Operators

—————————-

a) Exponentiation ^

b) Multiplication *

c) Division /

d) Integer division \

e) Mod Operator

f) Addition +

g) Subtraction –

h) Concatenation &

——————————

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