Perl Tutorial - 24: Conditional Operator Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming

hello guys welcome to my channel this is
the twenty-fourth tutorial in this
course and in this tutorial we'll be
talking about the conditional operator
in Perl so the conditional operator or
the conditional statement in Perl is you
know pretty much like the conditional
operator or the conditional statement in
any other language like C++ for instance
the syntax is very similar so it is in a
way a substitute for the if else
statement it's it's just a neater way of
writing code and it can be a little
confusing sometimes so you know you
should use it with caution
you know only when you don't want your
code to be too long and if you're making
too many decisions in the code and if
you're really comfortable using this
thing you should use it otherwise why I
usually prefer if else over conditionals
so anyway I'm going to demonstrate this
thing to you through a script that's
called conditional and in the script on
line number three I have created a
scalar variable called num which
currently has the value 15 and we will
try to do you know something that we've
done like bunch of times already in this
course we're going to see if the value
in num is even or not and for that if
you remember in the tutorial on if as
well as in the trade all on unless we
use conditions and we're going to use
the same condition here it says that the
name of the variable has changed from X
that has become numb so within
parenthesis you type your condition
which is going to be dollar num % 2 then
you know two equal to symbols this is
the Equality operator for numbers and
then you put 0 on the RHS so this is
going to be your test condition and if
this condition is going to be true then
we're going to do something if it's
going to be false we're going to do
another thing you know that's exactly
what we did in the tutorial on if else
but you know we have all of that you
know something that you would do over
five or maybe six lines using if-else
we're doing all of that on a single line
right so that's the advantage of using
conditional you just put a question mark
after the closing parenthesis of your
condition and then you put the first
thing that you want to exit
first and then you put a colon and then
you put the second option right so if
this is going to be true then the number
is even if this is going to be false
then the number is odd right so these
are two strings string values that I
have separated with a colon of course
and you know if this condition is going
to value to true I'm going to assign the
number is even to a string variable
called STR and if it's going to be false
then I'm going to assign this string to
STR and you know this is just one
application of conditional operators you
don't always have to make assignments
when you're using it and there are a
bunch of other ways in which you can use
it and you know I just thought that this
would be a great example and you know we
could also be continuing our trend of
testing even a rod for numeric values
but anyway after we store the right
string in the variable STR we are
printing it on line number seven through
a print statement it's really that
simple so I'll make sure the script is
saved I'll press f5 and I see that the
number is odd and that's because it
currently has a value 15 I'll change
this to 16 save and rerun and now I see
that the number is even so that was
about the conditional operator I hope
you guys had fun watching this tutorial
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