Signed integer types

data Int Source

data Int8 Source

data Int16 Source

data Int32 Source

data Int64 Source

• All arithmetic is performed modulo 2^n, where n is the number of bits in the type.
• For coercing between any two integer types, use fromIntegral , which is specialized for all the common cases so should be fast enough. Coercing word types (see Data.Word) to and from integer types preserves representation, not sign.
• The rules that hold for Enum instances over a bounded type such as Int (see the section of the Haskell report dealing with arithmetic sequences) also hold for the Enum instances over the various Int types defined here.
• Right and left shifts by amounts greater than or equal to the width of the type result in either zero or -1, depending on the sign of the value being shifted. This is contrary to the behaviour in C, which is undefined; a common interpretation is to truncate the shift count to the width of the type, for example 1 << 32 == 1 in some C implementations.