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shigemk2/11-233937.scala

Created July 11, 2015 15:47
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11-233937.scala
sealed trait Expr
case class N(n: Int) extends Expr
case class Var(x: String, a: Int, n: Int) extends Expr
case class Add(n: Expr*) extends Expr
case class Mul(n: Expr*) extends Expr
def add(xs: List[Expr]): Expr = xs match {
case List() => N(0)
case List(xs) => xs
case xs => Add(xs: _*) // Add(List(N(1), N(2), Var(x,2,2)))
}
println(add(List(N(1),N(2),Var("x",2,2))))
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