class ComplexNumber(private val re: Double, private val im: Double) {
  def +(otherNumber: ComplexNumber) = new ComplexNumber(re + otherNumber.re, im + otherNumber.im)

  def -(otherNumber: ComplexNumber) = new ComplexNumber(re - otherNumber.re, im - otherNumber.im)

  def *(otherNumber: ComplexNumber): ComplexNumber = {
    new ComplexNumber(re * otherNumber.re - im * otherNumber.im, im * otherNumber.re + re * otherNumber.im)
  }

  def printComplex(): Unit = {
    println(s"${re} + ${im}i")
  }
}

object ComplexNumbersCalculator extends App {
  private def createComplexNumberFromConsole() = {
    println("Enter real part:")
    val re = scala.io.StdIn.readDouble()

    println("Enter imaginary part:")
    val im = scala.io.StdIn.readDouble()

    new ComplexNumber(re, im)
  }

  private var continue = true
  while (continue) {
    val num1: ComplexNumber = createComplexNumberFromConsole()
    val num2: ComplexNumber = createComplexNumberFromConsole()

    println("Choose operation ['+', '-', '*']:")
    val operation = scala.io.StdIn.readChar()
    if (operation == '+') {
      (num1 + num2).printComplex()
    } else if (operation == '-') {
      (num1 - num2).printComplex()
    } else if (operation == '*') {
      (num1 * num2).printComplex()
    } else {
      println("Unknown operation!")
    }

    println("You want continue? (Y/n)")
    val continueRequest = scala.io.StdIn.readChar()
    continue = if (continueRequest == 'Y') true else false
  }
  println("Bye bye!")
}