Question

How to find the sum of all the multiples of 3 or 5 below 1000 in Scala

Answer 1

object SumOfMultiples {
  def main(args: Array[String]): Unit = {
    val limit = 999

    // Calculate the upper bounds
    val upperForThree = limit / 3
    val upperForFive = limit / 5
    val upperForFifteen = limit / 15

    // Calculate the sums using the arithmetic series formula
    val sumThree = 3 * upperForThree * (1 + upperForThree) / 2
    val sumFive = 5 * upperForFive * (1 + upperForFive) / 2
    val sumFifteen = 15 * upperForFifteen * (1 + upperForFifteen) / 2

    // Calculate the total sum
    val totalSum = sumThree + sumFive - sumFifteen

    println(totalSum)
  }
}

  
     
/*
run:
  
233168

*/

 

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Answer 2

object SumOfMultiples {
  def main(args: Array[String]): Unit = {
    var sum = 0

    // Iterate through numbers from 0 to 999
    for (x <- 0 until 1000) {
      if (x % 3 == 0 || x % 5 == 0) {
        sum += x
      }
    }

    println(sum)
  }
}

  
     
/*
run:
  
233168

*/

 

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