Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 45: Passing Arguments to Subroutines
Perl Tutorial - 45: Passing Arguments to Subroutines Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 45: Passing Arguments to Subroutines Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. How do you pass arguments to subroutines in Perl? |  |
Ans. In Perl, you can pass arguments to subroutines by simply including them within parentheses after the subroutine name. For example, if you have a subroutine called "mySub" and want to pass two arguments, you would write: mySub($arg1, $arg2).
| 2. Can I pass an array as an argument to a Perl subroutine? | |
Ans. Yes, you can pass an array as an argument to a Perl subroutine. To pass an array, you need to prefix the array variable with an "@" symbol. For example, if you have an array called "myArray" and want to pass it to a subroutine called "mySub", you would write: mySub(@myArray).
| 3. Is it possible to pass a hash as an argument to a Perl subroutine? | |
Ans. Yes, you can pass a hash as an argument to a Perl subroutine. To pass a hash, you need to prefix the hash variable with a "%" symbol. For example, if you have a hash called "myHash" and want to pass it to a subroutine called "mySub", you would write: mySub(%myHash).
| 4. Can I pass both arrays and hashes as arguments to a Perl subroutine? | |
Ans. Yes, you can pass both arrays and hashes as arguments to a Perl subroutine. To pass both arrays and hashes, you need to prefix the array variable with an "@" symbol and the hash variable with a "%" symbol. For example, if you have an array called "myArray" and a hash called "myHash" and want to pass them to a subroutine called "mySub", you would write: mySub(@myArray, %myHash).
| 5. How can I access the passed arguments within a Perl subroutine? | |
Ans. To access the passed arguments within a Perl subroutine, you can use the special array variable "@_". This array contains all the arguments passed to the subroutine. You can access individual arguments using their indices within the array. For example, to access the first argument, you would use $_[0], the second argument would be $_[1], and so on.
Text Transcript from Video
hello guys welcome to my channel this is
the 45th tutorial in this course and in
this tutorial we'll talk about how we
can pass arguments to subroutines and
purl so as you can see I have a script
opened up here it's called arguments and
in this script on line number three I
have used a sub keyword to create a
subroutine called rectangle and then the
chord in the subroutine I mean the body
of the subroutine starts at line number
four where I have the opening curly
brace and it ends at line number nine
where I have the closing curly brace for
the subroutine and then on line number
ten I have made a call to it the name is
rectangled and this time as you must
have noticed I have passed two numeric
arguments to the subroutine so arguments
are values with which this subroutine is
going to work so what we're going to try
to do is we are going to try to compute
the area and perimeter of a rectangle
you know given the fact that we know its
length and its width so the length and
width are going to be inputs to this
rectangle subroutine and given those
inputs it's going to compute for us the
area in the perimeter so on line number
five I have you know calculated the area
and I have stored it in a variable
called area and this is a scalar
variable of course that's why there's a
dollar sign here and in Perl the way you
access subroutines is you know you have
to use the add rate symbol then you have
to put an underscore and for accessing
the first argument passed you need to
fetch the value at index zero so you
know obviously since we have the address
symbol here you must have figured that
the values are passed in a list and the
first item in that list is the first
argument passed so in this case this
would be ten and then the item at index
one would be the second item pass so you
know that in this case would be 20 so
you calculate the area by multiplying
the length and width that's why I have
the asterisk in between the two
arguments and then you
calculate the parameters as twice of the
sum of length and width so you have to
add the two arguments first and then you
have to multiply the result with two to
get the parameter on line number seven I
have a print statement that is first we
will display the text area of to the of
the rectangle is and then it's going to
display the area and then the unit which
would be square units and on line number
eight I have a print statement that's
going to first respect X parameter of
the rectangle is and then it's going to
display the perimeter value and then
it's going to justice for the text units
so in Perl the peculiar thing about
passing arguments to subroutines is that
you do not have to mention in the
function declaration whether the
function is going to receive arguments
are not so over here I haven't put a set
of parentheses that's going to inform
Perl about the fact that this subroutine
is going to eventually accept arguments
when when you call the subroutine with
arguments Perl automatically realizes
that you are going to you you are trying
to pass arguments to the subroutine and
you know you can access those
subroutines in the manner thus shown so
I'll make sure that the script is saved
and I'll press f5 to run and we see that
the area of the rectangle is 200 square
units and the perimeter of the rectangle
is 60 units so that's correct those are
correct values and 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 in the next
tutorial till then take care
the 45th tutorial in this course and in
this tutorial we'll talk about how we
can pass arguments to subroutines and
purl so as you can see I have a script
opened up here it's called arguments and
in this script on line number three I
have used a sub keyword to create a
subroutine called rectangle and then the
chord in the subroutine I mean the body
of the subroutine starts at line number
four where I have the opening curly
brace and it ends at line number nine
where I have the closing curly brace for
the subroutine and then on line number
ten I have made a call to it the name is
rectangled and this time as you must
have noticed I have passed two numeric
arguments to the subroutine so arguments
are values with which this subroutine is
going to work so what we're going to try
to do is we are going to try to compute
the area and perimeter of a rectangle
you know given the fact that we know its
length and its width so the length and
width are going to be inputs to this
rectangle subroutine and given those
inputs it's going to compute for us the
area in the perimeter so on line number
five I have you know calculated the area
and I have stored it in a variable
called area and this is a scalar
variable of course that's why there's a
dollar sign here and in Perl the way you
access subroutines is you know you have
to use the add rate symbol then you have
to put an underscore and for accessing
the first argument passed you need to
fetch the value at index zero so you
know obviously since we have the address
symbol here you must have figured that
the values are passed in a list and the
first item in that list is the first
argument passed so in this case this
would be ten and then the item at index
one would be the second item pass so you
know that in this case would be 20 so
you calculate the area by multiplying
the length and width that's why I have
the asterisk in between the two
arguments and then you
calculate the parameters as twice of the
sum of length and width so you have to
add the two arguments first and then you
have to multiply the result with two to
get the parameter on line number seven I
have a print statement that is first we
will display the text area of to the of
the rectangle is and then it's going to
display the area and then the unit which
would be square units and on line number
eight I have a print statement that's
going to first respect X parameter of
the rectangle is and then it's going to
display the perimeter value and then
it's going to justice for the text units
so in Perl the peculiar thing about
passing arguments to subroutines is that
you do not have to mention in the
function declaration whether the
function is going to receive arguments
are not so over here I haven't put a set
of parentheses that's going to inform
Perl about the fact that this subroutine
is going to eventually accept arguments
when when you call the subroutine with
arguments Perl automatically realizes
that you are going to you you are trying
to pass arguments to the subroutine and
you know you can access those
subroutines in the manner thus shown so
I'll make sure that the script is saved
and I'll press f5 to run and we see that
the area of the rectangle is 200 square
units and the perimeter of the rectangle
is 60 units so that's correct those are
correct values and 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 in the next
tutorial till then take care
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About this Video
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Oct 24, 2024 Last updated |
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