Question

How to check if long addition will overflow in Scala

Answer 1

object OverflowCheck {
  val LongMax: Long = Long.MaxValue
  val LongMin: Long = Long.MinValue

  def addingWillOverflow(x: Long, y: Long): Boolean = {
    (x > 0 && y > LongMax - x) || (x < 0 && y < LongMin - x)
  }

  def main(args: Array[String]): Unit = {
    val x: Long = 39839299
    val y: Long = 1472783642
    println(if (addingWillOverflow(x, y)) "true" else "false")
    
    val x2: Long = 9223372036854775807L // Long.MaxValue
    val y2: Long = 1
    println(if (addingWillOverflow(x2, y2)) "true" else "false")
  }
}

 
/*
run:
 
false
true
 
*/

 

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