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Error in Chapter 6: p124

1 reply on 1 page. Most recent reply: Dec 30, 2007 9:52 PM by Frederic Jean

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Carsten Eckelmann

Posts: 6
Nickname: careck
Registered: Jun, 2003

Error in Chapter 6: p124

Posted: Dec 27, 2007 2:53 PM

when extending class Rationale to methods that take Int as parameters the book has this:

def + (that: Int) = this * new Rationale(that)
def - (that: Int) = this * new Rationale(that)
def * (that: Int) = this * new Rationale(that)
def / (that: Int) = this * new Rationale(that)

where of course it should be:

def + (that: Int) = this + new Rationale(that)
def - (that: Int) = this - new Rationale(that)
def * (that: Int) = this * new Rationale(that)
def / (that: Int) = this / new Rationale(that)

so even concise Scala programs aren't safe from the good old copy&paste errors ;)

Cheers,
Carsten.

Frederic Jean

Posts: 4
Nickname: freddyjean
Registered: Dec, 2007

Re: Error in Chapter 6: p124

Posted: Dec 30, 2007 9:52 PM

I actually had to specify the return type with scala 2.6.1:


    def + (that: Int): Rational = this + new Rational(that)
    def - (that: Int): Rational = this - new Rational(that)
    def * (that: Int): Rational = this * new Rational(that)
    def / (that: Int): Rational = this * new Rational(that)

Fred

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