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## You're reading fromThe Modern C# Challenge

Product type Book
Published in Oct 2018
Publisher Packt
ISBN-13 9781789535426
Pages 362 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Rod Stephens

Title Page
Dedication
Packt Upsell
Contributors
Preface
1. Mathematics 2. Geometry 3. Dates and Times 4. Randomization 5. Strings 6. Files and Directories 7. Advanced C# and .NET Features 8. Simulations 9. Cryptography 1. Other Books You May Enjoy Index

## Problems

Use the following problems to test your skills at working with strings. Give each problem a try before you turn to the solutions and download the example programs.

### 56. Roman numerals

Write `string` and `long` extension methods that convert between Roman and Arabic numerals. Use the usual Roman digits, I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, and M = 1,000. Also use the usual rules so that digits add unless a digit precedes a larger digit. For example, IX means subtract I from X to get 10 – 1 = 9.

Finally, support one extra rule that the Romans sometimes used to represent large numbers. That rule uses parentheses to represent multiplication by 1,000. For example, (IV)XIV means 4,014. Parentheses can be nested, as in ((XX)III)IV for 20,003,004, but won't appear in two places not nested, as in ((X))(III)IV.