Control Statements VBScript | Automation Testing QTP/UFT

What are Control Statements in VBScript?

A control statement is a statement that decides whether to execute another statement or decides which of the two statements to execute.

There are two types of Control Statements in VBScript

1. Conditional Statements
2. Loop Statements

What is a Statement?

Each and every line in VBScript

Let’s see both Conditional control statements and Looping control statements below

What are Conditional Control Statements in VBScript?

CONDITIONAL CONTROL STATEMENTS VBScript:

Used to execute single statements or set of statements based on conditions.

The following Conditional statements are available in VB Script:
IF STATEMENT: executes a set of statement when a condition is true
IF – ELSE STATEMENT: select one of two sets of statements to execute
IF – ELSEIF STATEMENT: select one of many sets of statements to execute
SELECT CASE STATEMENT: select one of many sets of statements to execute

Let’s see the syntax of each condition with an example below:

IF STATEMENT: (One conditional statement)

To execute only one statement when a condition is true:

SYNTAX:

IF THEN
set of statements
END IF

Example:

Dim a,b
a=8 : b=6
if a>b then
msgbox “a is greater than b”
End if

There is no “Else” in the above example. It performs only one action when a condition is true

IF – ELSE STATEMENT: (Two conditional statement)

SYNTAX:

IF THEN
set of statements
ELSE
set of statements
END IF

Example:

Dim a,b
a=3 : b=6
if a>b then
msgbox “a is greater than b”
Else
Msgbox “Stay tuned to Software Testing Material”
End if

It is to execute more than one statement when a condition is true.

IF – ELSEIF STATEMENT: (More than two conditional)

SYNTAX:

IF THEN
set of statements
ELSEIF Then
set of statements
ELSE
set of statements
END IF

Example:

Dim a,b
a=8 : b=6
if a>b then
msgbox “a is greater than b”
Elseif a=b then
Msgbox “a is equals to b”
Else
Msgbox “a is not equals to b”
End if

SELECT CASE STATEMENT:

It’s an alternative to IF-THEN-ELSE. It makes code more efficient and readable.

SYNTAX:

SELECT CASE EXPRESSION
CASE EXPRESSION1
set of statements
CASE EXPRESSION2
set of statements
CASE ELSE
set of statements
END SELECT

EXAMPLE:

InputValue = Inputbox(“Enter the value: red or green or yellow”)
Select case lcase(InputValue)
Case “red”
Msgbox “stop”
Case “green”
Msgbox “go”
Case “yellow”
Msgbox “wait”
Case else
Msgbox “Invalid”
End Select

NOTE:
In select case, the subdata type of “main expression” and “sub expression” should be same “same data type”
Data will always compare with equal relationship operator
Here the expressions are case sensitive. Eg: “Red” is not equal to “red”
In the above example, we used string function (lcase) to convert the input value to lowercase

What are Looping Control Statements in VBScript?

LOOPING CONTROL STATEMENTS VBScript:

Looping control statements allow running a group of statements repeatedly when the condition is true.
Following looping control statements are available in VBScript:
• While…Wend statement – It executes only when a condition is true. Use the Do-Loop statement instead of this.
• Do – Loop While statement – loops  while a condition is true
• Do While – Loop statement – It executes one time even if the condition is False
• Do – Loop Until statement – loops  until a condition is true
• For…Next statement – runs code a specified number of times
• For Each…Next statement – runs code for each item in a collection or each element of an array

Click here to see looping control statements in detail

Related posts:

• Arrays VBScript | Automation Testing QTP/UFT
• VBScript for Automation (QTP/UFT) Testing – Part 1
• VBScript for Automation (QTP/UFT) Testing – Part 2
• VBScript for Automation (QTP/UFT) Testing – Part 3
• VBScript for Automation (QTP/UFT) Testing – Part 4
• VBScript for Automation (QTP/UFT) Testing – Part 5