haskell - Int 和 Integer 有什么区别？

Question

在 Haskell 中，Int 和 Integer 之间有什么区别？答案记录在哪里？

Answer 1

"Integer" is an arbitrary precision type: it will hold any number no matter how big, up to the limit of your machine's memory…. This means you never have arithmetic overflows. On the other hand it also means your arithmetic is relatively slow. Lisp users may recognise the "bignum" type here.

"Int" is the more common 32 or 64 bit integer. Implementations vary, although it is guaranteed to be at least 30 bits.

来源:The Haskell Wikibook 。另外，您可能会找到Numbers Haskell 简介 的部分很有用。