211 

   212 // another example about Fractions

   213 import scala.language.implicitConversions

   214 import scala.language.reflectiveCalls

   215 

   216 

   217 case class Fraction(numer: Int, denom: Int) {

   218   override def toString = numer.toString + "/" + denom.toString

   219 

   220   def +(other: Fraction) = Fraction(numer + other.numer, denom + other.denom)

   221   def /(other: Fraction) = Fraction(numer * other.denom, denom * other.numer)

   222   def /% (other: Fraction) = Fraction(numer * other.denom, denom * other.numer)

   223 

   224 }

   225 

   226 implicit def Int2Fraction(x: Int) = Fraction(x, 1)

   227 

   228 

   229 val half = Fraction(1, 2)

   230 val third = Fraction (1, 3)

   231 

   232 half + third

   233 half / third

   234 

   235 // not sure if one can get this to work

   236 // properly, since Scala just cannot find out

   237 // if / is for ints or for Fractions 

   238 (1 / 3) + half

   239 (1 / 2) + third

   240 

   241 // either you have to force the Fraction-type by

   242 // using a method that is not defined for ints

   243 (1 /% 3) + half

   244 (1 /% 2) + third

   245 

   246 

   247 // ...or explicitly give the type in order to allow

   248 // Scala to do the conversion to Fractions 

   249 ((1:Fraction) / 3) + half

   250 (1 / (3: Fraction)) + half