#  While20.py (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-04-18  File created.
#  2022-12-16  Converted to Python 3.

#  The print() function prints a newline after each 
#  printing operation unless there is , end="" ) at the end
#  of the print call.

#  The while loops in Python programs are logically similar to
#  the while loops in Java/C++/C# languages.
#  The internal statements of the loop must be indented.

print( "\nNumbers from 0 to 20 are the following:\n" )

number_to_print  =  0

while  number_to_print  <=  20  :

   print( " %d"  %  number_to_print, end="" )
   number_to_print  +=  1

print( "\n" )