//
// program to count out change:
//
// prompt user for number of cents.
// print equivalent number of dollars, quarters, dimes, nickels, pennies.
//
// this version uses "val" variables only
// and includes some use of conditional execution:
//   rejects amounts < 0
//   only prints nonzero amounts
//
// this version uses "val" variables only
//

// the next line is needed to avoid warnings with the newest Scala
// "comment it out" (insert a //) if you compile with an earlier version
import scala.io.StdIn._

println("number of cents?")

val cents = readInt
println("input "+cents)

if (cents < 0) {
  println("number must be at least 0")
  sys.exit(0)
}

val dollars = cents / 100
if (dollars > 0) {
  println(dollars + " dollars")
}

val quarters = (cents - dollars*100) / 25
if (quarters > 0) {
  println(quarters + " quarters")
}

val dimes = (cents - dollars*100 - quarters*25) / 10
if (dimes > 0) {
  println(dimes + " dimes")
}

val nickels = (cents - dollars*100 - quarters*25 - dimes*10) / 5
if (nickels > 0) {
  println(nickels + " nickels")
}

val pennies = (cents - dollars*100 - quarters*25 - dimes*10 - nickels*5)
  if (pennies > 0) {
  println(pennies + " pennies")
}

val checkAnswer = dollars*100 + quarters*25 + dimes*10 + nickels*5 + pennies
// println("that adds up to "+checkAnswer)

if (checkAnswer == cents) {
  println("answer checks out!")
}
else {
  println("wrong answer!  " +checkAnswer)
}

// println("in dollars and cents "+dollars+"."+(cents%100))