Solving OCaml Problems

Define a function sign which given an integer returns 1 if it is positive, -1 if it is negative and 0 if it is zero.

my solutions

solution 1

let sign i = if i!=0 then (if i<0 then -1 else 1) else 0;;

solution 2

let sign x =  if x = 0 then 0 else    if x<0 then -1 else 1;;

It doesn't work for negative numbers but it works for positive numbers and zero.

I receive the following error

Error: This expression has type int -> int       but an expression was expected of type int