[Tutor] Roman Numeral to Digital
bgailer at alum.rpi.edu
Thu Mar 8 15:12:58 CET 2007
Kent Johnson wrote:
> Hi Alan,
> I am forwarding your question to tutor at python.org which is the correct
> address for the list. tutor-owner at python.org sends questions to the
> *maintainers* of the list, not the list itself.
> Alan Gilfoy wrote:
>> I am learning how to program in python as a major component of my
>> school's senior project, and my most recent assignment was to write a
>> program that converts Roman numerals to digital (base-10 Arabic numerals).
>> Now, I was told I have to write the program myself, but I was told I was
>> allowed to ask for hints. :)
>> As of right now, I've written a user interface (after all, here that's a
>> simple loop-and-prompt setup leading to print statements), but I have
>> "dummy code" in the place where the conversion code needs to be.
>> I want to create two separate functions:
>> print "Digital - to - Roman conversion (dummy code)"
>> roman_result = "XXX"
>> return roman_result
>> print "Roman - to - digital conversion (dummy code)"
>> digital_result = 30
>> return digital_result
>> I'm going to set each of those two "inputs" by a prompt asking for what
>> the program user wants to work with.
>> #Such as:
>> digital_input = int(raw_input("What digital (base-10) number do you wish
>> to convert to Roman numerals?))
>> I'm not sure how I would program Python to run the actual conversions.
>> PS: I'm familiar with Roman numerals, and I know how to do the
>> conversions manually.
Step 1: write down the steps you use "manually"
Step 2: for each step ask "how do I do this in Python:
I initialize the digital value to 0
digital_result = 0
I examine each roman numeral character in turn starting at the left (or
for rc in roman_input:
I lookup the character's decimal value
(note there are several ways to do this in Python - the "best" is a
dictionary), an if elif else statement, ....
I add it to the digital_result
Hope that gets you started. Write all the manual steps. Make sure each
is one simple operation. Walk thru the steps to verify that you have
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