F# – Program Structure
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F# is a Functional Programming language.
In F#, functions work like data types. You can declare and use a function in the same way like any other variable.
In general, an F# application does not have any specific entry point. The compiler executes all top-level statements in the file from top to bottom.
However, to follow procedural programming style, many applications keep a single top level statement that calls the main loop.
The following code shows a simple F# program −
open System
(* This is a multi-line comment *)
// This is a single-line comment
let sign num =
if num > 0 then "positive"
elif num < 0 then "negative"
else "zero"
let main() =
Console.WriteLine("sign 5: {0}", (sign 5))
main()
When you compile and execute the program, it yields the following output −
sign 5: positive
Please note that −
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An F# code file might begin with a number of open statements that is used to import namespaces.
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The body of the files includes other functions that implement the business logic of the application.
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The main loop contains the top executable statements.
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