Scala: method\operator overloading

Question

The following example is from the book \'Programming in Scala\'. Given a class \'Rational\' and the following method definition:

def add(that: Rational): Rat         


        

Answer 1

You haven't specified the binary + operator, you've specified the unary + operator.

So instead of:

def +(that: Int): Rational =
  +(new Rational(that, 1))

You need to write this:

def +(that: Int): Rational =
  this +(new Rational(that, 1))