/*  Meanvalue.c  (c) Kari Laitinen

    http://www.naturalprogramming.com

    2013-11-21  File created.
    2013-11-21  Last modification.
*/

#include  <stdio.h>

int main()
{
   int   integer_from_keyboard     =  0 ;
   int   number_of_integers_given  = -1 ;
   float mean_value                =  0 ;
   int   sum_of_integers           =  0 ;

   printf( "\n This program calculates the mean value of"
           "\n the integers that you enter from the keyboard."
           "\n Please, start entering numbers. The program"
           "\n stops when you enter a zero. \n\n" ) ;

   do
   {
      printf( "   Enter an integer: " ) ;
      scanf( "%d", &integer_from_keyboard ) ;

      number_of_integers_given  ++  ;
      sum_of_integers  =  sum_of_integers + integer_from_keyboard ;
   }
      while  ( integer_from_keyboard  !=  0 ) ;

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

   printf( "\n The mean value is: %f \n", mean_value ) ;
}