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Racket Hello World! 

Racket Hello World! 

   
   

Output:

Click on RUN button to see the output

Racket Online Compiler

Write, Run & Share Racket code online using OneCompiler's Racket online compiler for free. It's one of the robust, feature-rich online compilers for Racket language, running on the latest version 6.8. Getting started with the OneCompiler's Racket compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Racket. OneCompiler also has reference programs, where you can look for the sample programs and start learning. Happy learning!!

Taking inputs (stdin)

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

#lang racket/base
(define name (read))                
(printf "Hello ~a.\n" name)   

About Racket

Racket is a general-purpose programming language based on the Scheme dialect of Lisp. It is also used for scripting, computer science education, and research related applications.

Basics

ItemDecsription
;To comment a single line
;;to mark important comments
#;to comment the following s-expression

Data types

Data-typeDecsription
Numbersrepresents integers, float and complex numbers
Boolean#t and #f are the two boolean literals
StringsTo represent sequence of characters and double quotes("") are used to represent strings

Variables

let and define are used to declare variables

Syntax

(let ([id value-expression] ...) body ...+)

(let proc-id ([id init-expression] ...) body ...+)
define id expression

Example

> (let ([x 10]) x)
10

Loops and conditional statements

1. If family

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

If

(if cond-expr then-expr)

If-else

(if cond-expr then-expr else-expr)

2. For

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

(for (for-clause ...) body-or-break ... body)
where 

for-clause = [id seq-expr] | [(id ...) seq-expr] | #:when guard-expr | #:unless guard-expr | break-clause
 	 	 	 	 
break-clause = #:break guard-expr | #:final guard-expr
 	 	 	 	 
body-or-break = body | break-clause

seq-expr : sequence?

Functions

A lambda expression is used to create a function.

(lambda (argument-id ...)
  body ...+)

Help us with your feedback!

Reference Programs:

Racket

No tags available for Racket

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.