""" Purpose: demonstrate use of round() function to get a number with desired
        number of significant digits after the decimal point.
"""

# get input and convert to decimal
reply = input( "Enter number: " )
number = float( reply ) # takes input and converts it to a decimal

print()

# compute eight versions of number
number6 = round( number, 6 )            # rounds to six places after the decimal
number5 = round( number, 5 )            # rounds to five places after the decimal
number4 = round( number, 4 )            # rounds to four places after the decimal
number3 = round( number, 3 )            # rounds to three places after the decimal
number2 = round( number, 2 )            # rounds to two places after the decimal
number1 = round( number, 1 )            # rounds to one place after the decimal
number0 = round( number, 0 )            # rounds to zero places after the decimal
                                        # (produces a decimal)

rounded = round( number    )            # rounds to an integer
# if no number of digits is given, python will give you back an integer
# round() function only recognizes places after the decimal

# display original number and its eight variants
print( "number:", number )

print()

print( "round( number, 6 ):", number6 )
print( "round( number, 5 ):", number5 )
print( "round( number, 4 ):", number4 )
print( "round( number, 3 ):", number3 )
print( "round( number, 2 ):", number2 )
print( "round( number, 1 ):", number1 )
print( "round( number, 0 ):", number0 )

print()

print( "round( number ):", rounded )

# round is a built-in function, not a method (like split() )
# round( number, places ) is valid
# x = number.round() is nothing
# methods v built-in functions
# methods are a behavior of an object that the objects (like strings) have been designed to be able to do
# there is a format() function that helps us make sure that everything has the right number of zeroes
# we care more about problem solving than making the output pretty and perfect