Racket Hello World!
Racket Hello World!
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)
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.
|To comment a single line|
|to mark important comments|
|to comment the following s-expression|
|Numbers||represents integers, float and complex numbers|
|Strings||To represent sequence of characters and double quotes("") are used to represent strings|
let and define are used to declare variables
(let ([id value-expression] ...) body ...+) (let proc-id ([id init-expression] ...) body ...+)
define id expression
> (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 cond-expr then-expr)
(if cond-expr then-expr else-expr)
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?
A lambda expression is used to create a function.
(lambda (argument-id ...) body ...+)