//  MeanvalueException.java  (c) 2004 Kari Laitinen

//  http://www.naturalprogramming.com

//  2004-10-09  File created.
//  2004-12-19  Last modification.

import java.util.* ;

class MeanvalueException
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      System.out.print( "\n This program calculates the mean value of"
                     +  "\n the integers you enter from the keyboard."
                     +  "\n The program stops when you enter a letter."
                     +  "\n\n   Enter an integer: " ) ;

      int   number_of_integers_given  =  0 ;
      int   sum_of_integers           =  0 ;

      boolean  keyboard_input_is_numerical  =  true ;

      while ( keyboard_input_is_numerical ==  true )
      {
         try
         {
            int integer_from_keyboard  =  keyboard.nextInt() ;
            number_of_integers_given  ++  ;
            sum_of_integers  =  sum_of_integers + integer_from_keyboard ;
            System.out.print(  "   Enter an integer: " ) ;
         }
         catch ( Exception  not_numerical_input_exception )
         {
            keyboard_input_is_numerical  =  false ;
         }
      }

      float mean_value  =  0 ;

      if ( number_of_integers_given  >  0 )
      {
         mean_value  =  (float) sum_of_integers /
                        (float) number_of_integers_given ;
      }

      System.out.print( "\n The mean value is: " + mean_value + " \n" ) ;
   }
}