# [Easy/Tough] Roman Numerals

Jignesh Malavia

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Posts: 81

posted 12 years ago

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Write a program that converts Roman numerals to Arabic and reverse.

I = 1 (one)

V = 5 (five)

X = 10 (ten)

L = 50 (fifty)

C = 100 (one hundred)

D = 500 (five hundred)

M = 1000 (one thousand)

30 is written as XXX but 15 is not written as VVV

40 is written as XL but 45 is not written as VL

9 is written as IX but 49 is not written as IL and 99 is not written as IC

243 is written as CCXLIII

1510 is written as MDX

1999 is written as MCMXCIX

4,9,40,90,400,900 == IV,IX,XL,XC,CC,CM respectively

1) No googling for any more rules or hints.

If the above is just plain boring, then you can solve this quiz or read about the 1999 problem

**Values:**I = 1 (one)

V = 5 (five)

X = 10 (ten)

L = 50 (fifty)

C = 100 (one hundred)

D = 500 (five hundred)

M = 1000 (one thousand)

**Examples:**30 is written as XXX but 15 is not written as VVV

40 is written as XL but 45 is not written as VL

9 is written as IX but 49 is not written as IL and 99 is not written as IC

243 is written as CCXLIII

1510 is written as MDX

1999 is written as MCMXCIX

4,9,40,90,400,900 == IV,IX,XL,XC,CC,CM respectively

**Rules:**1) No googling for any more rules or hints.

**PS:**If the above is just plain boring, then you can solve this quiz or read about the 1999 problem

Joe Pluta

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Posts: 1376

It is sorta covered in the JavaRanch Style Guide. |