scala递归

object Tmp extends App{
  println(factorial(10))
  println(factorial1(10,1))
  def factorial(n:Int):Int ={
    if(n==1 || n==0) 1 else n*factorial(n-1)
  }

  @tailrec
  def factorial1(n:Int, a:Int): Int ={
    if(n==1 || n==0) a else factorial1(n-1,n*a)
  }
}