Programming in Scala Forum - eBook take 2: why not class Rational(numer: Int, ...?

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eBook take 2: why not class Rational(numer: Int, ...?

2 replies on 1 page. Most recent reply: Mar 3, 2008 7:38 PM by Howard Lovatt

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Rob Dickens

Posts: 15
Nickname: robcd
Registered: Feb, 2008

eBook take 2: why not class Rational(numer: Int, ...?

Posted: Feb 24, 2008 9:38 AM

I'm referring to the first version of this class, as given on page 138:

class Rational(n: Int, d: Int) { 
  val numer: Int = n 
  val denom: Int = d
  def ...

I was lead (page 79) to believe that class params become fields (if they're used), so why doesn't the following compile?:

class Rational(numer: Int, denom: Int) { 
  def ...

Rob Dickens

Posts: 15
Nickname: robcd
Registered: Feb, 2008

Re: eBook take 2: why not class Rational(numer: Int, ...?

Posted: Feb 27, 2008 12:56 PM

Is there anybody out there?

Okay, so Rational(val numer: Int, ... works (as explained on p213).

Howard Lovatt

Posts: 321
Nickname: hlovatt
Registered: Mar, 2003

Re: eBook take 2: why not class Rational(numer: Int, ...?

Posted: Mar 3, 2008 7:38 PM

There is a discussion of this already:

http://www.artima.com/forums/flat.jsp?forum=282&thread=221117

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