Scala无法将Double的表达式转换为Int

Question

我有以下方法,它返回两点之间的距离的绝对值作为Int.

  def absDist(a: Tuple2[Int, Int], b: Tuple2[Int, Int]): Int = {
    ((scala.math.pow(a._1 - b._1, 2) + scala.math.pow(a._2 - b._2, 2)): Int)
  }

但是,类型无法转换:

Expression of type Double doesn't conform to expected type Int

为什么会这样？我的转换对我来说很好看.

Answer 1

用于toInt进行类型转换:

def absDist(a: Tuple2[Int, Int], b: Tuple2[Int, Int]): Int = {
    (scala.math.pow(a._1 - b._1, 2) + scala.math.pow(a._2 - b._2, 2)).toInt
}