Exercises part 2

1. Define a wrapper record for integral values and implement Monoid so that (<+>) corresponds to (.&.).

   Hint: Have a look at the functions available from interface Bits to find a value suitable as the neutral element.

2. Define a wrapper record for integral values and implement Monoid so that (<+>) corresponds to (.|.).

3. Use bitwise operations to implement a function, which tests if a given value of type Bits64 is even or not.

4. Convert a value of type Bits64 to a string in binary representation.

5. Convert a value of type Bits64 to a string in hexadecimal representation.

   Hint: Use shiftR and (.&. 15) to access subsequent packages of four bits.