Book Image

The Modern C# Challenge

By : Rod Stephens
Book Image

The Modern C# Challenge

By: Rod Stephens

Overview of this book

C# is a multi-paradigm programming language. The Modern C# Challenge covers with aspects of the .NET Framework such as the Task Parallel Library (TPL) and CryptoAPI. It also encourages you to explore important programming trade-offs such as time versus space or simplicity. There may be many ways to solve a problem and there is often no single right way, but some solutions are definitely better than others. This book has combined these solutions to help you solve real-world problems with C#. In addition to describing programming trade-offs, The Modern C# Challenge will help you build a useful toolkit of techniques such as value caching, statistical analysis, and geometric algorithms. By the end of this book, you will have walked through challenges in C# and explored the .NET Framework in order to develop program logic for real-world applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
Dates and Times
Files and Directories
Advanced C# and .NET Features


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.


For more information about Roman numerals, including some interesting history and a fascinating story about inheritance, go to