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Roman Numeral converter specification

The program should start by printing

[language] Roman Numeral Converter

1) Numeral to integer
2) Integer to numeral

0) Exit

If the user enters anything other than 1, 2 or 0 the program should print Try again and wait for more input. If the user enters 0 then the program should exit successfully.

If the user enters 1 then the program should print Enter Roman Numeral and accept input. When the user presses enter/return then the program should check that the input is a valid Roman Numeral printing Invalid input otherwise and exiting. If the input is valid the program should convert the input to an integer. See below for more info. Then the program should print Value: [integer].

If the user enters 2 then the program should print Enter integer and accept input. When the user presses enter/return then the program should check that the input is a valid integer printing Invalid input otherwise and exiting. If the input is valid the program should convert the input to Roman Numerals. See below for more info. Then the program should print Numerals: [numerals].

Roman Numeral values

I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000

Numerals are read left to right, if the numeral to the right of the current one is higher then it is added to a running total, if it is lower then the running total is subtracted from the next numeral and the result becomes the new running total:

II = 2
IV = 4
VI = 6
XXL = 30

More info at wikipedia

Invalid values

As an example, VV probably isn't a valid numeral so how a program handles it is up to an implementation developers to decide.