Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 20: If Else Statement in Perl
Perl Tutorial - 20: If Else Statement in Perl Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 20: If Else Statement in Perl Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. What is the syntax for an if-else statement in Perl? |  |
Ans. The syntax for an if-else statement in Perl is as follows:
```
if (condition) {
# code to be executed if the condition is true
} else {
# code to be executed if the condition is false
}
```
| 2. Can I have multiple conditions in an if-else statement in Perl? | |
Ans. Yes, you can have multiple conditions in an if-else statement in Perl by using the `elsif` keyword. Here's an example:
```
if (condition1) {
# code to be executed if condition1 is true
} elsif (condition2) {
# code to be executed if condition2 is true
} else {
# code to be executed if all conditions are false
}
```
| 3. How can I use logical operators in an if-else statement in Perl? | |
Ans. You can use logical operators such as `&&` (logical AND), `||` (logical OR), and `!` (logical NOT) in an if-else statement in Perl to combine multiple conditions. For example:
```
if (condition1 && condition2) {
# code to be executed if both condition1 and condition2 are true
} elsif (condition1 || condition2) {
# code to be executed if either condition1 or condition2 is true
} else {
# code to be executed if all conditions are false
}
```
| 4. Can I nest if-else statements in Perl? | |
Ans. Yes, you can nest if-else statements in Perl by placing one if-else statement inside another. This allows you to create more complex logical conditions. Here's an example:
```
if (condition1) {
if (condition2) {
# code to be executed if both condition1 and condition2 are true
} else {
# code to be executed if condition1 is true but condition2 is false
}
} else {
# code to be executed if condition1 is false
}
```
| 5. Is it possible to have multiple else statements in an if-else statement in Perl? | |
Ans. No, it is not possible to have multiple else statements in an if-else statement in Perl. An if-else statement can only have one else block, which is executed if all the previous conditions are false. However, you can use nested if-else statements or logical operators to achieve more complex conditional logic.
Text Transcript from Video
hello guys welcome to my channel this is
the 20th through total in this course
and in this tutorial we are going to
talk about the if/else construct in Perl
so we're going to add just a little bit
more code in the script that we prepared
in the last tutorial and in the last
video if you remember we use the if
statement to check whether a number is
even or not and if it was even then we
used a print statement to display some
text so you know I just added a few more
lines in the script but I've renamed it
I've called this one if-else and on line
number three in the script I have
created a scalar variable called X which
has the value 21 currently and then on
line number five I have an if statement
which is first going to check whether
this value is even or not and it's going
to do that through the modulo operator
so I have the percent symbol here and my
divisor is going to be two and I'm going
to check whether the remainder you know
when I divide this number with two is
zero or not and I do that using two
equal to symbols and you know those are
my equality operator and the RHS is zero
right so I'm checking whether the
remainder of this operation is zero or
not if it is then I'm going to get
inside the if block which starts at line
number six and ends at line number eight
and it just has one print statement on
line number seven which is going to
display the text x is even and if this
condition is false in the last tutorial
we were not doing anything right so Paul
was checking this if it was true it was
showing this if it was false it was
doing nothing but now we have an else
statement immediately after the closing
curly brace of the if block on line
number eight so I have the keyword else
on line number nine and this does not
require a condition you know to check
because if this is going to be true
we're going to do this if it's going to
be false then we are automatically going
to come to line number nine and execute
whatever code we have inside the else
block which starts at line 10 and
at line 12 and just has one statement
within the scope it's it's gonna display
the text X is odd right and by the way
if this evaluates to true then pearl is
simply going to surpass everything
that's inside this else block it's going
to do nothing with this and it's gonna
move on you know after the statement if
there is some code it's going to jump to
that so anyway enough talking let me
save this file and I'll run this and
show it to you so at the moment X is odd
because X has the value 21 and let me
change this to 20 save the file and when
I run it I see that X is even right so
both the you know constructs have a
similar syntax you know the if and the
else statements it's just that you don't
have a condition with else there is
another construct that allows you to put
a condition with the else and we're
gonna check that maybe in the next
tutorial but you need to remember that
no matter what the value in X is only
one of these two print statements is
going to run right so that's the beauty
of F else and I hope you guys had fun
watching this video you may subscribe to
my channel if you haven't already I'm
going to see you in the next tutorial
till then take care
the 20th through total in this course
and in this tutorial we are going to
talk about the if/else construct in Perl
so we're going to add just a little bit
more code in the script that we prepared
in the last tutorial and in the last
video if you remember we use the if
statement to check whether a number is
even or not and if it was even then we
used a print statement to display some
text so you know I just added a few more
lines in the script but I've renamed it
I've called this one if-else and on line
number three in the script I have
created a scalar variable called X which
has the value 21 currently and then on
line number five I have an if statement
which is first going to check whether
this value is even or not and it's going
to do that through the modulo operator
so I have the percent symbol here and my
divisor is going to be two and I'm going
to check whether the remainder you know
when I divide this number with two is
zero or not and I do that using two
equal to symbols and you know those are
my equality operator and the RHS is zero
right so I'm checking whether the
remainder of this operation is zero or
not if it is then I'm going to get
inside the if block which starts at line
number six and ends at line number eight
and it just has one print statement on
line number seven which is going to
display the text x is even and if this
condition is false in the last tutorial
we were not doing anything right so Paul
was checking this if it was true it was
showing this if it was false it was
doing nothing but now we have an else
statement immediately after the closing
curly brace of the if block on line
number eight so I have the keyword else
on line number nine and this does not
require a condition you know to check
because if this is going to be true
we're going to do this if it's going to
be false then we are automatically going
to come to line number nine and execute
whatever code we have inside the else
block which starts at line 10 and
at line 12 and just has one statement
within the scope it's it's gonna display
the text X is odd right and by the way
if this evaluates to true then pearl is
simply going to surpass everything
that's inside this else block it's going
to do nothing with this and it's gonna
move on you know after the statement if
there is some code it's going to jump to
that so anyway enough talking let me
save this file and I'll run this and
show it to you so at the moment X is odd
because X has the value 21 and let me
change this to 20 save the file and when
I run it I see that X is even right so
both the you know constructs have a
similar syntax you know the if and the
else statements it's just that you don't
have a condition with else there is
another construct that allows you to put
a condition with the else and we're
gonna check that maybe in the next
tutorial but you need to remember that
no matter what the value in X is only
one of these two print statements is
going to run right so that's the beauty
of F else and I hope you guys had fun
watching this video you may subscribe to
my channel if you haven't already I'm
going to see you in the next tutorial
till then take care
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Dec 23, 2024 Last updated |
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