#----------------------------------------------------------------------
# (C) Monday, January 29, 2018 -- Dr. William T. Verts
#
# This second version checks each number to enforce that it is either
# 0 or positive.  The problem with this version is that the code to
# check values is essentially the same in each case.  We've written
# the same code twice.
#----------------------------------------------------------------------

N1 = input("Enter Number #1 --- ")
while (N1 < 0):
    print "This is not a positive number"
    N1 = input("Enter Number #1 --- ")
    
N2 = input("Enter Number #2 --- ")
while (N2 < 0):
    print "This is not a positive number"
    N2 = input("Enter Number #2 --- ")
    
A = (N1 + N2) / 2.0
print "The average is: ", A