Perl While Loop and Its Function

perl while loopIn the programming world, Perl is a high-level language that can be used for virtually anything. You can create all sorts of programs, software, and even games through Perl depending on what your expertise may be. Perl borrows heavily from other programs, which includes C, so if you’ve done programming before then it won’t be entirely foreign to you.

If you haven’t done any programming, then Perl can be a bit difficult to grasp, especially concepts, such as the while loop. Don’t worry though, there are courses you can check out that while give you a quick crash course in the program. The Udemy course, Beginning Perl, teaches you about the basics of the programming language using a very simple beginner’s tutorial.

Perl While Loop

With the Perl programming language, you can do various types of loop. One common loop found in Perl is the while loop. What the while loop does is continually iterate as long as a condition remains to be true.

A written example of a while loop would be something along the lines of while you are at work your income increases. So you have your condition, which is that you’re at work, and as long as that condition is true your income increases.

The benefit of the while loop is that it can continue indefinitely until the condition is no longer true. So until you leave work, you will keep making money.

Learning how to write this in Perl is pretty simple as well. In fact, Perl has been updated to a fifth iteration, which means that it can do even more than it could before. Check out the Udemy course Learn Perl 5 By Doing It, which gives you a hands-on experience in high-level coding.

Perl While Loop Example

Now that you understand the basic mechanics behind a while loop, you can see how you create one with Perl. This is a simple while loop, which demonstrates how it works.

$number = 20;
while ($number >=1)
{
print “$number “;
$number--;
}
print “No more numbers.\n”;

The symbols and words may look confusing, but when you look at it line by line you can see how it all works.

The first line in the program is $number, which establishes the value of the integer known as $number as 20. You will then see the while loop come immediately after it.

The second line in the program while($number >=1) is the condition, which means that while $number, which is currently equal to 20, is greater than or equal to 1, then the loop while do something.

What the loop does while this condition is true is found in between the two curly braces. In Perl, print means to write down so print $number; just writes down the number. Afterwards the line $number–; decreases the value of $number by 1. The loop then continues to do this until the value of $number is 0.

Once the loop reaches 0 it checks to see if the condition is correct and since it isn’t the loop is done, which means that the program moves onto the next line of code, which is print “No more numbers.\”n;

Just as you were told before, print just means to write something down, so the words “No more numbers” gets written down.

The total output of the while loop is:

20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 No more numbers

That’s all there is to it. Try to play around with the code and create your own while loops with different numbers and conditions.

If you want to get into programming, Perl is a great language for business. It the programming world it’s usually compared to another programming language called Python. You can see what the key differences for Perl vs. Python are as well as discover which is best for you to learn first.

Becoming a Professional Programmer

The while loop is just one feature of Perl programming, and there are countless other things you can do with it. There are a quite a few different ways to write loops as well. If you want to become a professional programmer, you should consider learning about Perl so that you can at least recognize it when it is presented to you. If you already fee you know enough about programming and are ready to start workign in this field, then check out the Udemy course Break Into the Programming Business, which has a strong focus on helping you learn how to become a professional in the programming world.

You don’t even have to work for a company. The programming world is vast, and you can be your own boss if you want. Even if you’ve only done a small amount of coding, you can still find different ways to program and make a living wage from it. There’s an Udemy course that can teach you all about it called Coding for Entrepreneurs, which will help you learn what you need to know to start making money.