//
// simple demo of using loops to operate on arrays
//
println("how many values?")
val n = readInt
val a = new Array[Int](n)
fillArray(a)

println("you entered:")
printArray(a)

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

def fillArray(a : Array[Int]) {
  for (i <- 0 until a.size)
    a(i) = readInt
}

def printArray(a : Array[Int]) {
  for (i <- 0 until a.size)
    println(a(i))
}

def arrayCombine(a : Array[Int], 
  combine : (Int, Int) => Int, identity : Int) : Int = 
{
  var result = identity
  for (i <- 0 until a.size) 
    result = combine(result, a(i))
  result
}