Your code is quite hard to read, especially as I don't know Fortran. Can I have it with indentation (indent each line 2+ spaces to make a code block)? --- Int

Your code is quite hard to read, especially as I don't know Fortran. Can I have it with indentation (indent each line 2+ spaces to make a code block)? --- Integers are boxed because Haskell's semantics almost exclusively deal with boxed types (eg. you can't pass unboxed types to most functions). The optimizer might specialize some functions for boxed types, but this is a transparent optimization and does not affect semantics.