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Many simple file-processing tasks require reading all the lines of a file. You can do this by reading all the lines in one action as an array using System.IO.File.ReadAllLines: > open System.IO;; > File.ReadAllLines("test.txt");; val it : string [] = [| "This is a test file."; "It is easy to read." |]

The type of this function is as follows:

/* comment goes here */ /* comment goes here too */

If necessary, the entire file can be read as a single string using System.IO.File.ReadAllText: > File.ReadAllText("test.txt");; val it : string = "This is a test file.\r\nIt is easy to read\r\n" You can also use the results of System.IO.File.ReadAllLines as part of a list or sequence defined using a sequence expression: > [ for line in File.ReadAllLines("test.txt") do let words = line.Split [| ' ' |] if words.Length > 3 && words.[2] = "easy" then yield line ];; val it : string list = [| "It is easy to read." |]

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For example: > hcf 18 12;; val it : int = 6 > hcf 33 24;; val it : int = 3 However, this algorithm is not generic, since as written it works only over integers. In particular, although the operator (-) is by default overloaded in F#, each use of the operator must be associated with at most one type decided at compile time. We discuss this restriction in more detail in the section Understanding Generic Overloaded Operators. In addition, the constant 0 is an integer and is not overloaded. Despite this, this algorithm can be easily generalized to work over any type. To achieve this, you must provide an explicit zero, a subtraction function, and an ordering. Here s one way to do this: let hcfGeneric (zero,sub,lessThan) = let rec hcf a b = if a=zero then b elif lessThan a b then hcf a (sub b a) else hcf (sub a b) b hcf The inferred, generic type of this function is as follows:

/* this call does something else based on i */ var1= do_something_else(i); if (var1) { /* This comment explains some really interesting thing about the following statement(s). */ do_it_again(); } }

The .NET namespace System.IO contains the primary .NET types for reading/writing bytes and text to/from data sources. The primary output constructs in this namespace are as follows: System.IO.BinaryWriter: Writes primitive data types as binary values. Create using new BinaryWriter(stream). You can create output streams using File.Create(filename). System.IO.StreamWriter: Writes textual strings and characters to a stream. The text is encoded according to a particular Unicode encoding. Create by using new StreamWriter(stream) and its variants or by using File.CreateText(filename). System.IO.StringWriter: Writes textual strings to a StringBuilder, which eventually can be used to generate a string.

val hcfGeneric : 'a * ('a -> 'a -> 'a) * ('a -> 'a -> bool) -> ('a -> 'a -> 'a)

Here is a simple example of using System.IO.File.CreateText to create a StreamWriter and write two strings: > let outp = File.CreateText("playlist.txt");; val outp : StreamWriter > outp.WriteLine("Enchanted");; val it : unit = ()

Tip Never use repeating *s to emphasize portions of code. It distracts the reader from the code and makes for a cluttered look. Besides, it s too much work to get all those things to line up especially when you edit your comments later.

Here the numeric type being manipulated has type 'a in the inferred type, and the result is a computed function. This uses techniques for computing functions similar to those discussed in 3. Here are some examples of using this generic function: let hcfInt = hcfGeneric (0, (-),(<)) let hcfInt64 = hcfGeneric (0L,(-),(<)) let hcfBigInt = hcfGeneric (0I,(-),(<)) Note that when we instantiate the generic function for the particular cases, we are drawing on particular instances of the default overloaded operator (-). We can check that the code is executing correctly as follows:

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