//
// simple demo of using recursive functions to operate on arrays
//
def fillArray(a : Array[Int], startIndex : Int) {
  if (startIndex < a.size) {
    a(startIndex) = readInt
    fillArray(a, startIndex + 1)
  }
}
def printArray(a : Array[Int], startIndex : Int) {
  if (startIndex < a.size) {
    println(a(startIndex))
    printArray(a, startIndex + 1)
  }
}
def arrayCombine(a : Array[Int], startIndex : Int,
  combine : (Int, Int) => Int, identity : Int) : Int = 
{
  if (startIndex < a.size) {
    combine(a(startIndex), arrayCombine(a, startIndex + 1, combine, identity))
  }
  else {
    identity
  }
}

val a1 = new Array[Int](6)
println("enter " + a1.size + " values for array:")
fillArray(a1, 0)

println("you entered:")
printArray(a1, 0)

println("sum = " + arrayCombine(a1, 0, (x,y)=>(x+y), 0))
println("product = " + arrayCombine(a1, 0, (x,y)=>(x*y), 1))
println("min = " + arrayCombine(a1, 0, (x,y) => (x min y), Int.MaxValue))
println("max = " + arrayCombine(a1, 0, (x,y) => (x max y), Int.MinValue))