#  Whilesum.py Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-02-24  File created.
#  2006-05-27  Last modification.

#  A comma at the end of the print statement specifies
#  that a newline should not be printed after the printing operation.

integer_from_keyboard   =  -1
sum_of_integers         =   0

print "\n This program calculates the sum of the integers" \
      "\n you type in from the keyboard. By entering a"    \
      "\n zero you can terminate the program. \n"

while integer_from_keyboard  !=  0 :

   print "  Current sum: %8d    Enter an integer: "  %  sum_of_integers,

   integer_from_keyboard  = int( raw_input() )

   sum_of_integers  =  sum_of_integers + integer_from_keyboard