logo image

Perl Hello World! 

Perl Hello World! 

   
   

Output:

Click on RUN button to see the output

Perl Online Compiler

Write, Run & Share Perl code online using OneCompiler's Perl online compiler for free. It's one of the robust, feature-rich online compilers for Perl language, running on the latest version 5.22.1. Getting started with the OneCompiler's Perl compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Perl. OneCompiler also has reference programs, where you can look for the sample programs and start learning. Happy learning!!

Taking inputs (stdin)

OneCompiler's Perl online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample Perl program which takes name as input and prints hello message with your name.

my $name = <STDIN>;             
print "Hello $name.\n";          

About Perl

Perl(Practical Extraction and Report Language) is especially desined for text processing by Larry Wall.

Key features

  • Cross-platform
  • Efficient for mission critical applications.
  • Open-source
  • Supports both procedural and object-oriented programming.
  • Perl interpreter is embeddable with other systems.
  • Loosely typed language

Syntax help

Data types

There is no need to specify the type of the data in Perl as it is loosely typed language.

TypedescriptionUsage
ScalarScalar is either a number or a string or an address of a variable(reference)$var
ArraysArray is an ordered list of scalars, you can access arrays with indexes which starts from 0@arr = (1,2,3)
HashHash is an unordered set of key/value pairs%ul = (1,'foo', 2, 'bar)

Variables

In Perl, there is no need to explicitly declare variables to reserve memory space. When you assign a value to a variable, declaration happens automatically.

$var-name =value; #scalar-variable
@arr-name = (values); #Array-variables
%hashes = (key-value pairs); # Hash-variables 

Loops

1. If family:

If, If-else, Nested-Ifs are used when you want to perform a certain set of operations based on conditional expressions.

If

if(conditional-expression){    
//code    
} 

If-else

if(conditional-expression){  
//code if condition is true  
}else{  
//code if condition is false  
} 

Nested-If-else

if(condition-expression1){  
//code if above condition is true  
}else if(condition-expression2){  
//code if above condition is true  
}  
else if(condition-expression3){  
//code if above condition is true  
}  
...  
else{  
//code if all the conditions are false  
}  

2. Switch:

There is no case or switch in perl, instead we use given and when to check the code for multiple conditions.

given(expr){    
when (value1)  
{//code if above value is matched;}    
when (value2)  
{//code if above value is matched;}   
when (value3)  
{//code if above value is matched;}  
default  
{//code if all the above cases are not matched.}     
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of ierations is not known in advance.

while(condition) {  
 // code 
}  

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition); 

Sub-routines

Sub-routines are similar to functions which contains set of statements. Usually sub-routines are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

How to define a sub-routine

sub subroutine_name 
{
	# set of Statements
}

How to call a sub-routine

subroutine_name();
subroutine_name(arguments-list); // if arguments are present 

Help us with your feedback!

Reference Programs:

Perl

No tags available for Perl

How to use?

Choose the language in which you want to run your program, by clicking the button next to Run. And then write your code in the code box, You can use the auto complete snippets and warnings and errors which helps you to write better code faster way.
Once you are done writing your code click the Run button, now the code will be submitted to OneCompiler and you will see the results in a second.

How to contribute?

Please fork OneCompiler repository and contribute us by adding more languages or the features to the existing OneCompiler backend.
You can also contibute to the community by adding more programs which users can search and use as base code for their programs.

API & More

You can embed OneCompiler into your own website. That helps your website users to write and test their programs within your website.
If you want to run and see the results from your backend you can utilize the OneCompiler API by integrating it with your backend.