Question

How to calculate the Nth prime number in Scala

Answer 1

// 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73

object CalculateNthPrimeNumber_Scala {
  def getTheNthPrimeNumber(nth: Int): Int = {
    var prime = 1
    var count = 0

    while (count < nth) {
      prime += 1
      var i = 2
      while (i <= prime && prime % i != 0) {
        i += 1
      }
      if (i == prime) {
        count += 1
      }
    }

    prime
  }

  def main(args: Array[String]): Unit = {
    val nth = 8
    
    println(s"Nth prime: ${getTheNthPrimeNumber(nth)}")
  }
}




/*
run:
    
Nth prime: 19
    
*/

 

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