Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 47: Counting Number of Arguments
Perl Tutorial - 47: Counting Number of Arguments Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 47: Counting Number of Arguments Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. How can I count the number of arguments in a Perl program? |  |
Ans. In Perl, you can count the number of arguments passed to a program by using the special variable "$#ARGV". This variable holds the index of the last element in the "@ARGV" array, which represents the command-line arguments. By adding 1 to "$#ARGV", you can get the total count of arguments.
| 2. Can I pass command-line arguments to a Perl program? | |
Ans. Yes, you can pass command-line arguments to a Perl program. These arguments can be accessed using the special array "@ARGV". Each argument passed will be stored as an element in this array. You can access individual arguments using indices like "$ARGV[0]", "$ARGV[1]", and so on.
| 3. How do I handle situations where no arguments are passed to a Perl program? | |
Ans. To handle situations where no arguments are passed to a Perl program, you can check the value of "$#ARGV" before accessing the arguments. If "$#ARGV" is -1, it means no arguments were passed. You can then display an appropriate message or perform any desired action.
| 4. Can I use the number of arguments to control program flow in Perl? | |
Ans. Yes, the number of arguments can be used to control program flow in Perl. By checking the value of "$#ARGV" or the count of arguments, you can implement conditional statements or loops based on the number of arguments passed. This allows you to handle different scenarios or execute specific code blocks based on the argument count.
| 5. Is there a limit to the number of arguments that can be passed to a Perl program? | |
Ans. In Perl, there is typically no hard limit on the number of arguments that can be passed to a program. However, there may be practical limitations based on the system's memory and resources. It is always advisable to handle large numbers of arguments efficiently to avoid any performance issues.
Text Transcript from Video
hello guys welcome to my channel this is
the 47th tutorial in this course and in
this tutorial we are going to see how we
can count the number of arguments that
have been passed to a subroutine there's
gonna be a really short and simple
tutorial and I have already created the
script it's called args underscore
number and in the script on line number
three I have created a subroutine called
count me and of course I've used the sub
keyword to do that and then on line
number eight I have made a call to this
subroutine and I passed three arguments
to it the first two are numbers number
one in two and then the third argument
is a string of text I know what you did
last summer so what we are trying to do
is you know display the number three on
screen basically that's what we're
trying to do because there are three
arguments that have been passed and we
want to know the number that the you
know the number of arguments have been
passed so inside the subroutine within
the body all you have to do is assign
the add rate underscore special list
which holds the arguments that have been
passed to the subroutine count me to a
scalar variable num and you don't have
to name this variable num you could name
it anything and if you do not like
simply assigning array variables to
scalar variables we've already seen this
in the course earlier when we understood
how we can count the number of elements
in an array variable we followed the
same approach but there's also a
function called scalar that you can use
around your array variable if you want
to make things if you want to make
things look more neat but anyway this
will get the job done so the output
would be stored in the variable num and
that output would be the number of
arguments that have been passed so the
next thing for us to do is to display
that number on screen and that's why I
have a print statement on line number
six which is first going to display the
text the number of arguments passed it's
going to show an equal to symbol and
then it's going to display the value
stored in the variable num and I make
sure this file saved
and I'll press f5 to run the script and
there we go we see that the number of
arguments passed is equal to three now
I'm gonna make a slight change after
this string of text I'm gonna pass
another numeric value four and I'll
rerun the script by pressing f5 and
there we go we see that the number of
arguments passed is four so that's it
for this tutorial I hope you guys had
fun watching this video you may
subscribe to my channel if you haven't
already I'm gonna see you the next
tutorial till then take care
the 47th tutorial in this course and in
this tutorial we are going to see how we
can count the number of arguments that
have been passed to a subroutine there's
gonna be a really short and simple
tutorial and I have already created the
script it's called args underscore
number and in the script on line number
three I have created a subroutine called
count me and of course I've used the sub
keyword to do that and then on line
number eight I have made a call to this
subroutine and I passed three arguments
to it the first two are numbers number
one in two and then the third argument
is a string of text I know what you did
last summer so what we are trying to do
is you know display the number three on
screen basically that's what we're
trying to do because there are three
arguments that have been passed and we
want to know the number that the you
know the number of arguments have been
passed so inside the subroutine within
the body all you have to do is assign
the add rate underscore special list
which holds the arguments that have been
passed to the subroutine count me to a
scalar variable num and you don't have
to name this variable num you could name
it anything and if you do not like
simply assigning array variables to
scalar variables we've already seen this
in the course earlier when we understood
how we can count the number of elements
in an array variable we followed the
same approach but there's also a
function called scalar that you can use
around your array variable if you want
to make things if you want to make
things look more neat but anyway this
will get the job done so the output
would be stored in the variable num and
that output would be the number of
arguments that have been passed so the
next thing for us to do is to display
that number on screen and that's why I
have a print statement on line number
six which is first going to display the
text the number of arguments passed it's
going to show an equal to symbol and
then it's going to display the value
stored in the variable num and I make
sure this file saved
and I'll press f5 to run the script and
there we go we see that the number of
arguments passed is equal to three now
I'm gonna make a slight change after
this string of text I'm gonna pass
another numeric value four and I'll
rerun the script by pressing f5 and
there we go we see that the number of
arguments passed is four so that's it
for this tutorial I hope you guys had
fun watching this video you may
subscribe to my channel if you haven't
already I'm gonna see you the next
tutorial till then take care
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Dec 23, 2024 Last updated |
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