F# Hello World!
F# Hello World!
Click on RUN button to see the output
F sharp Online Compiler
Write, Run & Share
F# code online using OneCompiler's F# online compiler for free. It's one of the robust, feature-rich online compilers for
F# language, running on the latest version 4.0. Getting started with the OneCompiler's
F# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as
F#. OneCompiler also has reference programs, where you can look for the sample programs and start learning. Happy learning!!
Read inputs from stdin
F# online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample
F# program which takes name as input and prints hello message with your name.
open System let name = Console.ReadLine() Console.Write("Hello 0.\n", name)
F#(F sharp) is a functional programming language which was developed by Microsoft in the year 2005.
F# is .net implementation of OCaml. It can be used in variety of applications like graphic designing, Telecommunications, AI, CPU design, compiler programming, web applications, games etc.,
Integer Data types
|sbyte||8-bit signed integer||1 byte||-128 to 127|
|byte||8-bit unsigned integer||1 byte||0 to 255|
|int16||16-bit signed integer||2 bytes||-32768 to 32767|
|unit16||16-bit unsigned integer||2 bytes||0 to 65,535|
|int/int32||32-bit signed integer||4 bytes||-2,147,483,648 to 2,147,483,647|
|uint32||32-bit unsigned integer||4 bytes||0 to 4,294,967,295|
|int64||64-bit signed integer||8 bytes||-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807|
|uint64||64-bit unsigned integer||8 bytes||0 to 18,446,744,073,709,551,615|
|bigint||arbitrary precision integer||At least 4 bytes||Integers|
Float Data types
|float32||32-bit signed floating point number||4 bytes||±1.5e-45 to ±3.4e38|
|float||64-bit signed floating point number||8 bytes||±5.0e-324 to ±1.7e308|
|decimal||128-bit signed floating point number||16 bytes||±1.0e-28 to ±7.9e28|
Text and Boolean Data types
|char||single character||2 bytes||U+0000 to U+ffff|
|string||Text||20 + (2 * length of the string) bytes||0 to up to 2 billion characters|
|bool||Stores either true or false||1 byte||True or false|
Variable is a name given to the storage area in order to manipulate them in our programs.
let variable_name:data-type = value
Mutable variable declaration
let mutable variable_name:data-type = value
When ever you want to perform a set of operations based on a condition or set of conditions then If or IF-ELSE or Nested If-Elif-Else are used.
if conditional-expression then // code
if conditional-expression then // code else // code
if conditional-expression then // code elif conditional-expression then // code elif conditional-expression then // code ... else // code
For loop is used to iterate a set of statements based on a condition.
Iteration occurs in ascending order
for var = start-expression to end-expression do // code
Iteration occurs in descending order.
for var = start-expression downto end-expression do // code
This loops is used when iteration occurs over enumerable collection like arrays, lists, sequences, range expression etc.
for pattern in enumerable-collection-expr do // code
let listItems = [1,2,3,4,5] for x in listItems do printfn "%d" x
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations is not known in advance.
while condition-expr do // code
F#, You can declare and use functions similar to Variables. In simpler words, you can understand them as user-defined variables.
How to define a function
let [inline] function-name parameter-list [ : return-type ] = function-body
How to call a function
let Var = function-name parameter-list