Perl Tutorial - 49: Return Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming

hello guys welcome to my channel this is
the 49th tutorial in this course and in
this world we will be checking out the
return statement in Perl so I have a
script
it's called return and in this script on
line number three I have used the sub
keyword to create a subroutine called
circle and through this subroutine we're
going to try to compute the area of a
circle provided we know the radius and
the formed of course is PI R square
where R is the radius and we're going to
do this computation inside you know the
subroutine circle I mean within its
definition but we're not going to use a
print statement from within circle to
display the resultant you know that's
something that we have been doing over
the last four tutorials perhaps we've
always had the print statement inside
the subroutine but this time we're going
to do the calculation inside the
subroutine and then we are going to use
the return keyword to pass the output to
a variable that's outside the subroutine
and then we're going to print the
contents of that variable using a print
statement outside the subroutine so as I
mentioned we have created the subroutine
circle on line number three then on line
number five I have assigned the argument
that is passed to the subroutine
obviously you know we're just going to
pass one argument because we only need
the radius so we're going to create a
copy of it in a scalar variable called
radius and then I have the keyword
return on line number six and you don't
have to put whatever value you want to
return within parentheses or anything
that's not important you just have to
you know do the calculation and then you
have to use the return keyword so return
give a space and then 3.14 times radius
times radius we're just squaring the
value of the radius and multiplying it
with pi which is 3.14 and return is
going to push that value out to the
calling satan so on line number eight i
have called this subroutine you can see
that I have the name circle here
and then within parentheses I have 10 so
that's the argument which we are passing
to the subroutine and the return
statement is going to you know throw the
output to this statement so on line
number eight when we are calling the
subroutine the output is going to be
stored in the variable area and then on
line banana have a print statement which
is first going to display the text the
this has to be area let me just correct
it so the area of the circle is and then
it's going to show the value and then
it's going to display a text square
units so I hope this is clear this is
really not that complicated I might have
made it look like complicated and when I
press f5 to run the script we see that
the area of the circle is 314 square
units because the value that we passed
was 1010 square is hundred and then
hundred multiplied by 3.14 is of course
314 and the area would be 314 square
units so that's it for this tutorial I
hope you guys had fun watching this one
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