#  Meanvalue.py (c) 1997-2006 Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-04-13  File created.
#  2006-05-27  Last modification.

#  The corresponding Java/C++/C# programs (e.g. Meanvalue.java)
#  demonstrate the do-while loops of those langauges.
#  The Python programming language does not have do-while loops.
#  Hence, this program is written using a while loop.

integer_from_keyboard     = -1
number_of_integers_given  = -1
mean_value                =  0.0
sum_of_integers           =  0 

print  "\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"

while  integer_from_keyboard  !=  0  :

   print  "   Enter an integer:",
   integer_from_keyboard  =  int( raw_input() ) 

   number_of_integers_given  +=  1
   sum_of_integers  =  sum_of_integers + integer_from_keyboard


if  number_of_integers_given  >  0 :

    mean_value  =  float( sum_of_integers ) /      \
                   float( number_of_integers_given  )

print "\n The mean value is: %f"  %  mean_value