Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 22: Unless Statement in Perl
Perl Tutorial - 22: Unless Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 22: Unless Statement in Perl Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. What is the purpose of the unless statement in Perl? |  |
Ans. The unless statement in Perl is used to execute a block of code if a condition evaluates to false. It provides an alternative to the if statement, which executes the code block when the condition is true.
| 2. How is the syntax of the unless statement different from the if statement in Perl? | |
Ans. The syntax of the unless statement in Perl is slightly different from the if statement. In the unless statement, the condition is placed after the keyword "unless" followed by the code block. If the condition evaluates to false, the code block is executed. In contrast, the if statement executes the code block when the condition is true.
| 3. Can we have an else block with the unless statement in Perl? | |
Ans. No, the unless statement does not provide an else block. If you need to execute a different block of code when the condition is false, you can use the if statement instead. However, you can use the else block with the if statement to handle the false condition.
| 4. How can we use the unless statement in combination with logical operators in Perl? | |
Ans. The unless statement in Perl can be combined with logical operators such as "and", "or", and "not" to create complex conditions. For example, you can use "unless ($a == 1 and $b == 2)" to execute a block of code if both $a and $b are not equal to 1 and 2, respectively.
| 5. Is there any difference in the behavior of the unless statement compared to the if statement in Perl? | |
Ans. No, there is no difference in the behavior of the unless statement compared to the if statement in Perl. Both statements are used to control the flow of the program based on a condition. The only difference lies in the condition evaluation – the unless statement executes the code block when the condition is false, while the if statement executes the code block when the condition is true.
Text Transcript from Video
hello guys welcome to my channel this is
the 22nd to Doyle in this course and in
this tutorial we'll be talking about the
unless statement and purl
so the unless in a way is an alternative
to the if statement and its syntax is
very similar to the if statement and
purl and what unless allows you to do is
in if you run the cord that's inside the
if block when the test condition
evaluates to true unless it's the other
way round so if the test condition would
evaluate to false then the cord inside
the unless block would work right so
I've got a script here that's called
unless and in this script we'll be
trying to do the same thing that we did
the in the script on if so you know
we're going to check if the value in the
variable X is an even number or not and
the test condition for that of course is
checking the remainder when you divide
the number by two if that is equal to
zero or not so you know dollar X percent
2 equals zero that's going to be our
test condition but if this was an if
statement and if this condition value to
true then you would be printing that X
is even but in our case unless is going
to check you know for all values of X
which are not even right till the time
this condition is false it's going to
print X as odd and as soon as you know
this condition becomes true it's going
to do nothing right so it's just the
opposite of if and I'll run this code to
show you the output and we see that X is
odd because X has the value 11 for the
time being and let me just press a key
and shut this window and now I'm going
to change the value of x to ten save the
file and run the script again and it
does when you press any key to continue
because you know there isn't an else
here so it's not gonna do anything
basically so that's it for now I hope
you guys had fun watching this tutorial
and you may subscribe to my channel if
you haven't already I'm going to see you
in the next video till then take care
the 22nd to Doyle in this course and in
this tutorial we'll be talking about the
unless statement and purl
so the unless in a way is an alternative
to the if statement and its syntax is
very similar to the if statement and
purl and what unless allows you to do is
in if you run the cord that's inside the
if block when the test condition
evaluates to true unless it's the other
way round so if the test condition would
evaluate to false then the cord inside
the unless block would work right so
I've got a script here that's called
unless and in this script we'll be
trying to do the same thing that we did
the in the script on if so you know
we're going to check if the value in the
variable X is an even number or not and
the test condition for that of course is
checking the remainder when you divide
the number by two if that is equal to
zero or not so you know dollar X percent
2 equals zero that's going to be our
test condition but if this was an if
statement and if this condition value to
true then you would be printing that X
is even but in our case unless is going
to check you know for all values of X
which are not even right till the time
this condition is false it's going to
print X as odd and as soon as you know
this condition becomes true it's going
to do nothing right so it's just the
opposite of if and I'll run this code to
show you the output and we see that X is
odd because X has the value 11 for the
time being and let me just press a key
and shut this window and now I'm going
to change the value of x to ten save the
file and run the script again and it
does when you press any key to continue
because you know there isn't an else
here so it's not gonna do anything
basically so that's it for now I hope
you guys had fun watching this tutorial
and you may subscribe to my channel if
you haven't already I'm going to see you
in the next video till then take care
Related Exams
About this Video
|
4.77/5 Rating |
|
Dec 23, 2024 Last updated |
Video Description: Perl Tutorial - 22: Unless Statement in Perl for Back-End Programming 2024 is part of Perl Building Blocks: An Introduction to Perl preparation.
The notes and questions for Perl Tutorial - 22: Unless Statement in Perl have been prepared according to the Back-End Programming exam syllabus.
Information about Perl Tutorial - 22: Unless Statement in Perl covers all important topics for Back-End Programming 2024 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Perl Tutorial - 22: Unless Statement in Perl.
Introduction of Perl Tutorial - 22: Unless Statement in Perl in English is available as part of our Perl Building Blocks: An Introduction to Perl for Back-End Programming & Perl Tutorial - 22: Unless Statement in Perl in
Hindi for Perl Building Blocks: An Introduction to Perl course. Download more important topics related with notes, lectures and mock test series for
Back-End Programming Exam by signing up for free.
Description
Video Lecture & Questions for Perl Tutorial - 22: Unless Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming - Back-End Programming full syllabus preparation | Free video for Back-End Programming exam to prepare for Perl Building Blocks: An Introduction to Perl.
Information about Perl Tutorial - 22: Unless Statement in Perl
Here you can find the meaning of Perl Tutorial - 22: Unless Statement in Perl defined & explained in the simplest way possible.
Besides explaining types of Perl Tutorial - 22: Unless Statement in Perl theory, EduRev gives you an ample number of questions to practice Perl Tutorial - 22: Unless Statement in Perl tests,
examples and also practice Back-End Programming tests.
|
Explore Courses for Back-End Programming exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
practice quizzes
,Summary
,mock tests for examination
,Semester Notes
,Extra Questions
,Perl Tutorial - 22: Unless Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
,past year papers
,Perl Tutorial - 22: Unless Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
,Important questions
,Sample Paper
,ppt
,shortcuts and tricks
,Free
,study material
,Viva Questions
,MCQs
,Perl Tutorial - 22: Unless Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
,video lectures
,Exam
,Previous Year Questions with Solutions
,Objective type Questions
;
Study Perl Tutorial - 22: Unless Statement in Perl on the App
Students of Back-End Programming can study Perl Tutorial - 22: Unless Statement in Perl alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Perl Tutorial - 22: Unless Statement in Perl,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Perl Tutorial - 22: Unless Statement in Perl is prepared as per the latest Back-End Programming syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup