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object Rationals {
class Rational(x :Int, y: Int) {
def numer = x
def denom = y
def neg = new Rational(-numer, denom)
def add(that: Rational) =
new Rational(
numer * that.denom + that.numer * denom,
denom * that.denom)
def sub(that: Rational) = add(that.neg)
override def toString = numer + "/" + denom
}
def run = {
println("Rationals")
println(new Rational(2, 3).add(new Rational(3, 4)).toString)
println(new Rational(1, 3).sub(new Rational(5 ,7)).sub(new Rational(3, 2)).toString)
}
}
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