scala中计算的的一个小问题,超出Int.maxValue时不会报错

Posted 2020-10-01 牵牛花

如果小于Int.max时他不会报错

    def sumcount(str:String): Int ={

      val ints = for(c <- str)yield {   println(c.asInstanceOf[Int]) ; c.asInstanceOf[Int]}
      println(ints.reduce(_*_))
      println(Int.MaxValue)
      ints.sum
    }

sumcount("Hello")

72
101
108
108
111
825152896
2147483647

 

  def sumcount(str:String): Long ={

      val ints = for(c <- str)yield {   println(c.asInstanceOf[Long]) ; c.asInstanceOf[Long]}
      println(ints.reduce(_*_))
      println(Int.MaxValue)
      println(Long.MaxValue)
      ints.sum
    }

sumcount("Hello")