// 
// program to sum integers from file and write result to output file
//

println("enter name of file containing ints")
val inputName = readLine
val source = scala.io.Source.fromFile(inputName)
val sum = source.getLines.map(_.toInt).sum
source.close

val outputName = "results.txt"
val out = new java.io.PrintWriter(new java.io.File(outputName))
out.println("sum = " + sum)
out.close

println("output in " + outputName)