//
// program to sum up numbers, entered from standard input
// ending with "quit"
//
// similar to sum.scala example but uses loop rather than recursion
//

import scala.io.StdIn._

println("enter some integers, 'quit' to end")

var sum = 0

var in = readLine

while (in != "quit") {
  sum += in.toInt
  in = readLine

}

println("sum = " + sum)