F# Basic Tutorial
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F# - Data Types
F# - Data Types
The data types in F# can be classified as follows −
Integral types
Floating point types
Text types
Other types
Integral Data Type
The following table provides the integral data types of F#. These are basically integer data types.
| F# Type | Size | Range | Example | Remarks |
|---|---|---|---|---|
| sbyte | 1 byte | -128 to 127 | 42y -11y |
8-bit signed integer |
| byte | 1 byte | 0 to 255 | 42uy 200uy |
8-bit unsigned integer |
| int16 | 2 bytes | -32768 to 32767 | 42s -11s |
16-bit signed integer |
| uint16 | 2 bytes | 0 to 65,535 | 42us 200us |
16-bit unsigned integer |
| int/int32 | 4 bytes | -2,147,483,648 to 2,147,483,647 | 42 -11 |
32-bit signed integer |
| uint32 | 4 bytes | 0 to 4,294,967,295 | 42u 200u |
32-bit unsigned integer |
| int64 | 8 bytes | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | 42L -11L |
64-bit signed integer |
| uint64 | 8 bytes | 0 to 18,446,744,073,709,551,615 | 42UL 200UL |
64-bit unsigned integer |
| bigint | At least 4 bytes | any integer | 42I 1499999 9999999 9999999 9999999 9999I |
arbitrary precision integer |
Example
(* single byte integer *) let x = 268.97f let y = 312.58f let z = x + y printfn "x: %f" x printfn "y: %f" y printfn "z: %f" z (* unsigned 8-bit natural number *) let p = 2uy let q = 4uy let r = p + q printfn "p: %i" p printfn "q: %i" q printfn "r: %i" r (* signed 16-bit integer *) let a = 12s let b = 24s let c = a + b printfn "a: %i" a printfn "b: %i" b printfn "c: %i" c (* signed 32-bit integer *) let d = 212l let e = 504l let f = d + e printfn "d: %i" d printfn "e: %i" e printfn "f: %i" f
When you compile and execute the program, it yields the following output −
x: 1 y: 2 z: 3 p: 2 q: 4 r: 6 a: 12 b: 24 c: 36 d: 212 e: 504 f: 716
Floating Point Data Types
The following table provides the floating point data types of F#.
| F# Type | Size | Range | Example | Remarks |
|---|---|---|---|---|
| float32 | 4 bytes | ±1.5e-45 to ±3.4e38 | 42.0F -11.0F |
32-bit signed floating point number (7 significant digits) |
| float | 8 bytes | ±5.0e-324 to ±1.7e308 | 42.0 -11.0 |
64-bit signed floating point number (15-16 significant digits) |
| decimal | 16 bytes | ±1.0e-28 to ±7.9e28 | 42.0M -11.0M |
128-bit signed floating point number (28-29 significant digits) |
| BigRational | At least 4 bytes | Any rational number. | 42N -11N |
Arbitrary precision rational number. Using this type requires a reference to FSharp.PowerPack.dll. |
Example
(* 32-bit signed floating point number *) (* 7 significant digits *) let d = 212.098f let e = 504.768f let f = d + e printfn "d: %f" d printfn "e: %f" e printfn "f: %f" f (* 64-bit signed floating point number *) (* 15-16 significant digits *) let x = 21290.098 let y = 50446.768 let z = x + y printfn "x: %g" x printfn "y: %g" y printfn "z: %g" z
When you compile and execute the program, it yields the following output −
d: 212.098000 e: 504.768000 f: 716.866000 x: 21290.1 y: 50446.8 z: 71736.9
Text Data Types
The following table provides the text data types of F#.
| F# Type | Size | Range | Example | Remarks |
|---|---|---|---|---|
| char | 2 bytes | U+0000 to U+ffff | x
|
Single unicode characters |
| string | 20 + (2 * string s length) bytes | 0 to about 2 bilpon characters | "Hello" "World" |
Unicode text |
Example
let choice = y let name = "Zara Ap" let org = "Tutorials Point" printfn "Choice: %c" choice printfn "Name: %s" name printfn "Organisation: %s" org
When you compile and execute the program, it yields the following output −
Choice: y Name: Zara Ap Organisation: Tutorials Point
Other Data Types
The following table provides some other data types of F#.
| F# Type | Size | Range | Example | Remarks |
|---|---|---|---|---|
| bool | 1 byte | Only two possible values, true or false | true false |
Stores boolean values |
Example
let trueVal = true let falseVal = false printfn "True Value: %b" (trueVal) printfn "False Value: %b" (falseVal)
When you compile and execute the program, it yields the following output −
True Value: true False Value: falseAdvertisements