''' Purpose: print integers 0 to n-1 for a user-supplied n. then
        print out 'Ready or not here I come!'
'''


# get n
reply = input( 'Enter a number: ' )
n = int( reply )

# print out integers 0 to n-1

# i is an iterator

# range hands back first number to the second number - 1
# range( 0, n ) is 0, 1, 2, ..., n-1
# if the first number is bigger than the second number there is nothing to count up to

for i in range( 0, n ): # the colon is needed for syntax reasons; tells python that the statement is done
    print( i, n - i )   # for loop does everything indented

print( 'Ready or not here I come!' ) # the un-indentation tells Python that the body of the loop is over

#for i in range( 0, n+1 ): # this allows the count to go up to n
#   print( i)

# BELOW WILL ONLY PRINT OUT 0 AND n
# REMEMBER TO INCLUDE RANGE!!!! THIS IS IMPORTANT FOR TEST!!!!!
#for i in ( 0, n ): # the colon is needed
#   print( i )      # for loop does everything indented

# Why iterate?
# If you need to print out unknown values a for loop allows you to repeat actions
# that allow flexibility in a program