first program

Visual Studio 2010 includes a new programming language, F#. To create a new console application

1. On the File menu, point to New, and then click Project.
2. If you cannot see Visual F# in the Templates Categories pane, click Other Languages, and then click Visual F#. The Templates pane in the center lists the F# templates.
3. Look at the top of the Templates pane to make sure that .NET Framework 4 appears in the Target Framework box.
4. Click F# Application in the list of templates.
5. Type a name for your project in the Name field.
6. Click OK.
7. The new project appears in Solution Explorer.

First F# program holds integer (its square) and string value and then print them later.

open System
let iNum = 5
let strMsg = "Hello"
let iSquare = iNum * iNum
System.Console.WriteLine(iNum )
System.Console.WriteLine(aString)
System.Console.WriteLine(iSquare)

Like other .NET languages, press CTRL+F5 to run the code. A Command Prompt window appears that contains the following values.

Otherwise, you can execute F# program using Interactive window. First, select the let expressions in the previous procedure. Then, right-click the selected area and then click Send to Interactive. Alternatively, press ALT+ENTER.

The F# Interactive window opens and the results of interpreting the let expressions are displayed.