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 |

(* 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. |

(* 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 billion characters |
"Hello" "World" |
Unicode text |

let choice = 'y' let name = "Zara Ali" 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 Ali 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 |

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: false