LOOPS
IN VBScript: To execute a block of
code more than one time, we can use loops in VBScript
a)
WHILE LOOP:
To execute a block of code more than one time as long as given condition
is true
----------------
---------------- (1)
----------------
While
Condition
---------------- (2)
---------------- True (Loop)
(3) False (Exit) ----------------
Wend
----------------
----------------
----------------
NOTE: While loop ends with
“Wend” (Not case sensitive)
b)
DOWHILE LOOP: To execute a block of code more than one time
as long as the condition is true, In this loop, the code will be executed at
least once at the beginning without a condition
----------------
----------------
----------------
Do (1)
---------------- (2)
---------------- True (Loop)
----------------
While
condition
---------------- (3) False (Exit)
----------------
----------------
c)
DOUNTIL LOOP: To execute a block of code more than one time
as long as given condition is false, we can use this loop
----------------
----------------
----------------
Do (1)
---------------- (2)
---------------- False (Loop)
----------------
Until
condition
---------------- (3) True (Exit)
----------------
----------------
NOTE: DOUNTIL loop is otherwise
around to DOWHILE loop
VBScript has an option of “EXIT DO” statement to terminate from
“DOWHILE” and “DOUNTIL” loops if required
----------------
----------------
----------------
Do
----------------
----------------
----------------
If
condition then
Exit
do
True (Exit) While
condition
---------------- False
(Exit)
----------------
----------------
d)
FORLOOP:
To execute a block of code for specified number of times, we can use
this loop
EXP:
For i = 1 to 10 step 1
------------------
------------------
------------------
Next (Exit)
The above loop executes 10 times
EXP:
For i = 0 to 9 step 1
------------------
------------------
------------------
Next (Exit)
The above loop executes 10 times (here “0” counts as one loop)
EXP:
For i = 10 to 1 step -1
------------------
------------------
------------------
Next (Exit)
The above loop executes 10 times
EXP:
For i = 1 to 10 step 3
------------------
------------------
------------------
Next (Exit)
The above loop executes 4 times (first execution is 1, then 4, then 7,
and 10)
e)
FOREACH LOOP: To run a block of code more than one time
depends on each element in an array or list
EXP:
X = array (123, “mindq”,
“abc”, 789)
X(0) x(1) x(2) x(3)
------------------
------------------
------------------
Next (Exit)
This loop executes 4 times based on he values in X array
ARRAYS IN VBScript: Variables
are used to store one value at a time of any type, but arrays are used to store
multiple values of any type. To create
arrays in VBScript, we can follow below code
Option explicit
Dim x(4)
In above example, X is an ARRAY with 5 values in it (0-4)
EXP: x(0) x(1) x(2) x(3) x(4)
“abc”
|
123
|
“mindq”
|
10.5
|
“date”
|
X=
From the above diagram, X is an array with 5 values or elements and
each element will be accessible by using an array name and index, index starts
with x(0)
EXP: x(3) = 4th element in “X” array
The first index x(0) is called LBOUND (lower bound)
The last index x(4) is called UBOUND (upper bound)
EXPAMPLE#1: Write a VBScript
code in QTP tool to create an array with 5 elements to store 5 subject marks into
that array, and display total marks
Option explicit
Dim x(4), i, y
For i = 0 to 4 step 1
x(i)=inputbox ("Enter a
subject marks")
Next
y=0
For i = 0 to 4 step 1
y = y+x(i)
Next
msgbox("Total Marks "&y)
EXPAMPLE#2: Write a VBScript
code in QTP tool to create an array with 5 elements to store 5 Sentences, with
at least one or two sentences with a word “INDIA”
Option explicit
Dim x(4), i
For i = 0 to 4 step 1
x(i)=inputbox ("Enter a
Sentence")
Next
For i = 0 to 4 step 1
If instr (x(i), "india")<>0 Then
msgbox (x(i))
End If
Next
INSTR ( ):- This function is used to check the availability of sub
string in main string
SYTAX: instr(“mindq”, “testing”)
(m-string) (s-string)
If available returns “position”
If not available returns “0”
