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'
'\t' |
Single unicode characters |
| string |
20 + (2 * string's length) bytes |
0 to about 2 billion characters |
"Hello"
"World" |
Unicode text |
Example
let choice = 'y'
let name = "Zara Ali"
let org = "Howcodex"
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: Howcodex
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: false
