//  MeanvalueException.kt  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2020-10-30  File created.

fun main()
{
   print( "\n This program calculates the mean value of"
       +  "\n the integers you enter from the keyboard."
       +  "\n Please, start entering numbers. The program"
       +  "\n stops when you enter a letter. \n\n" )

   var  number_of_integers_given = 0
   var  sum_of_integers          = 0
   
   var keyboard_input_is_numerical  =  true

   while ( keyboard_input_is_numerical ==  true )
   {
      try
      {
         print( "   Enter an integer: " )
         val integer_from_keyboard  =  readLine()!!.toInt()

         number_of_integers_given  += 1
         sum_of_integers  =  sum_of_integers + integer_from_keyboard
      }
      catch ( not_numerical_input_exception : Exception )
      {
         keyboard_input_is_numerical  =  false
      }
   }

   var  mean_value  =  0.0  // The type of mean_value becomes
                            // Double as we assign a Double value

   if ( number_of_integers_given  >  0 )
   {
      mean_value  =  sum_of_integers.toDouble() /
                     number_of_integers_given.toDouble()
   }

   print( String.format( "\n The mean value is: %f \n\n", mean_value ) )
}