Primitive Types (F#)

This topic lists the fundamental primitive types that are used in the F# language. It also provides the corresponding .NET types and the minimum and maximum values for each type.

Summary of Primitive Types

The following table summarizes the properties of the primitive F# types.

Type	.NET type	Description
bool	Boolean	Possible values are true and false.
byte	Byte	Values from 0 to 255.
sbyte	SByte	Values from -128 to 127.
int16	Int16	Values from -32768 to 32767.
uint16	UInt16	Values from 0 to 65535.
int	Int32	Values from -2,147,483,648 to 2,147,483,647.
uint32	UInt32	Values from 0 to 4,294,967,295.
int64	Int64	Values from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
uint64	UInt64	Values from 0 to 18,446,744,073,709,551,615.
nativeint	IntPtr	A native pointer as a signed integer.
unativeint	UIntPtr	A native pointer as an unsigned integer.
char	Char	Unicode character values.
string	String	Unicode text.
decimal	Decimal	A floating point data type that has at least 28 significant digits.
unit	not applicable	Indicates the absence of an actual value. The type has only one formal value, which is denoted (). The unit value, (), is often used as a placeholder where a value is needed but no real value is available or makes sense.
void	Void	Indicates no type or value.
float32, single	Single	A 32-bit floating point type.
float, double	Double	A 64-bit floating point type.

Note

You can perform computations with integers too big for the 64-bit integer type by using the bigint type. bigint is not considered a primitive type; it is an abbreviation for BigInteger.

See Also

Other Resources

F# Language Reference