Max Int Value for OCaml

int, ocaml, primitive

Solution

$ ocaml
        OCaml version 4.01.0

# max_int;;
- : int = 4611686018427387903
# let a : int = max_int;;
val a : int = 4611686018427387903

Update

For what it's worth, if you're on a 32-bit system, Int32.max_int still doesn't fit into an int, even if you correct the mistake of thinking that the L (l) at the end is a 1:

# Int32.max_int;;
- : int32 = 2147483647l
# let i : int = 21474836471 (* Mistake *);;
Characters 14-25:
  let i : int = 21474836471 (* Mistake *);;
                ^^^^^^^^^^^
Error: Integer literal exceeds the range of representable integers of type int
# let i : int = 2147483647 (* No mistake *);;
Characters 14-24:
  let i : int = 2147483647 (* No mistake *);;
                ^^^^^^^^^^
Error: Integer literal exceeds the range of representable integers of type int
#

So I'd say the L wasn't the problem.

Problem

I just came off an interview where I needed to use this value for the algorithm I came up with. After the interview I was curious if there was actually a way to get the max Int value. I am aware of Int32.max_int and Int64.max_int. However when I set Int32.max_int's value to an int it exceeded the max value an Int have have. ``` # Int32.max_int;; - : int32 = 2147483647l # let a: int = 21474836471;; Characters 13-24: let a: int = 21474836471;; ^^^^^^^^^^^ Error: Integer literal exceeds the range of representable integers of type int ```

Original source