Question

How to sum all the prime numbers in an array with Scala

Answer 1

import scala.math.sqrt

def isPrime(n: Int): Int = {
  if (n == 0 || n == 1) return 0

  for (i <- 2 to sqrt(n).toInt) {
    if (n % i == 0) {
      return 0
    }
  }

  return 1
}

val arr = List(9, 8, 17, 5, 19, 22, 21, 13, 38, 500, 99)
var sumprime = 0

for (i <- arr.indices) {
  if (isPrime(arr(i)) == 1) { // 19 17 5 13
    sumprime += arr(i)
  }
}

println(sumprime)



   
/*
run:

54
   
*/

 

 

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