How do I write an if statement in Perl?

Perl supports various types of if statements: If. If-else….The syntax of if else-if statement is given below:

if(condition1){
//code to be executed if condition1 is true.
}else if(condition2){
//code to be executed if condition2 is true.
}
else if(condition3){
//code to be executed if condition3 is true.
}

What are conditional statements in Perl?

Perl conditional statements helps in the decision making, which require that the programmer specifies one or more conditions to be evaluated or tested by the program, along with a statement or statements to be executed if the condition is determined to be true, and optionally, other statements to be executed if the …

What is $@ in Perl?

$@ The Perl syntax error or routine error message from the last eval, do-FILE, or require command. If set, either the compilation failed, or the die function was executed within the code of the eval.

What symbol is used to identify subroutines?

Exp: & Symbol is used to identify subroutine in Perl.

What is difference between package and module in Perl?

A Perl package is a collection of code which resides in its own namespace. Perl module is a package defined in a file having the same name as that of the package and having extension .

What is Data :: Dumper?

8.50. Data::Dumper. Converts Perl data structures into strings that can be printed or used with eval to reconstruct the original structures. Takes a list of scalars or reference variables and writes out their contents in Perl syntax. $d = Data::Dumper->new([$foo, $bar], [qw(foo *ary)]); …

What are scalar variables in Perl?

A scalar is a variable that stores a single unit of data at a time. The data that will be stored by the scalar variable can be of the different type like string, character, floating point, a large group of strings or it can be a webpage and so on. Example : Perl.

What is undef in Perl?

undef is used for those variables which do not have any assigned value. So basically when the programmer will declare a scalar variable and don’t assign a value to it then variable is supposed to be contain undef value. In Perl, if the initial value of a variable is undef then it will print nothing.

What are subroutines in Perl?

A Perl function or subroutine is a group of statements that together perform a specific task. In every programming language user want to reuse the code. So the user puts the section of code in function or subroutine so that there will be no need to write code again and again.

Which of the following is a good Characterisation of subroutines?

Which of the following is a good characterization of subroutines? A subroutine is a piece of code with a specific function that can be called multiple times.

What is Perl if statement?

How to control the execution of code conditionally in Perl?

Summary: in this tutorial, you are going to learn about Perl if statement that allows you to control the execution of code conditionally. Perl if statement allows you to control the execution of your code based on conditions. The simplest form of the if statement is as follows: In this form, you can put the if statement after another statement.

Is everything else is true in Perl?

Everything else is true. If you do not remember the rules or you doubt whether a condition is true or false, you can always write a simple if statement to test if the expression. The limitation of the Perl if statement is that it allows you to execute a single statement only.

How to test if an expression is true or false Perl?

If you do not remember the rules or you doubt whether a condition is true or false, you can always write a simple if statement to test if the expression. The limitation of the Perl if statement is that it allows you to execute a single statement only. If you want to execute multiple statements based on a condition, you use the following form: