Question

How to check if long multiplication will overflow in Scala

Answer 1

object OverflowCheck {
  def multiplyWillOverflow(x: Long, y: Long): Boolean = {
    if (x == 0) return false
    if (y > Long.MaxValue / x) return true
    if (y < Long.MinValue / x) return true
    false
  }

  def main(args: Array[String]): Unit = {
    var x: Long = 34
    var y: Long = 14727836
    println(if (multiplyWillOverflow(x, y)) "true" else "false")

    x = 133883
    y = 189993272783642L
    println(if (multiplyWillOverflow(x, y)) "true" else "false")
  }
}


 
/*
run:
 
false
true
 
*/

 

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