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Converting Roman to Arabic

Now that you are an expert in converting roman numerals to numbers its time to save yourself the trouble and write a program that does it for you. Heres an outline of what you should do.

1. Ask the user to enter a roman numeral

2. Validate the number to make sure it follows all the rules. The number in the picture should cause you to print an error message.

3. If the roman numeral is valid then you should convert it to its Arabic equivalent.

4. Print out the roman numeral and its Arabic equivalent.

Hint: You will want to start by using a dictionary to map each single character roman numeral to the correct Arabic number.