Reference no: EM132390213

COMP9021 Principles of Programming

Assignment

Aim. The purpose of the assignment is to:

• develop your problem solving skills;

• design and implement the solution to a program in the form of a medium sized Python program;

• practice the use of arithmetic computations, tests, repetitions, lists, and strings.

Assessment Description

You will design and implement a program that prompts the user for an input with How can I help you? .

User input should be one of three possible kinds:

• Please convert ***

• Please convert *** using ***

• Please convert *** minimally

If user input is not of this form, with any occurrence of *** an arbitrary nonempty sequence of nonspace symbols, then the program should print out

I don't get what you want, sorry mate!

and stop.

2.1. First kind of input. In case the user inputs Please convert ***, then *** should be either a strictly positive integer (whose representation should not start with 0) that can be converted to a Roman number (hence be at most equal to 3999), or a valid Roman number; otherwise, the program should print out Hey, ask me something that's not impossible to do!

and stop.

If the input is as expected, then the program should perform the conversion, from Arabic to Roman or from Roman to Arabic, and print out the result in the form
Sure! It is ***

2.2. Second kind of input. In case the user inputs Please convert *** using ***, then the first *** should be a strictly positive integer (whose representation should not start with 0) or a sequence of (lowercase or uppercase) letters and the second *** should be a sequence of distinct (lowercase or uppercase) letters.
Moreover,

• the second *** is intended to represent a sequence of so-called generalised Roman symbols, the classical Roman symbols corresponding to the sequence MDCLXVI, whose rightmost element is meant to represent

1, the second rightmost element, 5, the third rightmost element, 10, etc.;

• if it is not an integer, the first *** is intended to represent a so-called generalised Roman number, that is, a sequence of generalised Roman symbols that can be decoded using the provided sequence of generalised Roman symbols similarly to the way Roman numbers are represented.

If that is not the case, of if it is not possible to convert the first *** from Arabic to generalised Roman or from generalised Roman to Arabic, then the program should print out

Hey, ask me something that's not impossible to do!

and stop. If the input is as expected and the conversion can be performed, then the program should indeed perform the conversion, from Arabic to generalised Roman or from generalised Roman to Arabic, and print out the result in the form

Sure! It is ***

2.3. Third kind of input. In case the user inputs Please convert *** minimally, then *** should be a sequence of (lowercase or uppercase) letters. The program will try and view *** as a generalised Roman number with respect to some sequence of generalised Roman symbols. If that is not possible, then the program should print out

Hey, ask me something that's not impossible to do!

and stop. Otherwise, the program should find the smallest integer that could be converted from ***, viewed as some generalised Roman number, to Arabic, and output a message of the form

Sure! It is *** using ***

2.4. Sample outputs. Here are a few tests together with the expected outputs. The outputs of your program should be exactly as shown.

$ python3 roman_arabic.py

How can I help you? Please do my assignment...

I don't get what you want, sorry mate!

$ python3 roman_arabic.py

How can I help you? please convert 35

I don't get what you want, sorry mate!

$ python3 roman_arabic.py

How can I help you? Please convert 035

Hey, ask me something that's not impossible to do!