Kata: TDD Arabic to Roman Numbers with C#

Project

Create a solution with a class and test project

dotnet new classlib -n Number
cd Number
dotnet restore
cd ..

dotnet new xunit -n Number.Tests
cd Number.Tests
dotnet add reference ../Number/Number.csproj
dotnet add package Moq
dotnet add package coverlet.msbuild
dotnet restore
cd ..

dotnet new sln -n Number
dotnet sln Number.sln add ./Number/Number.csproj
dotnet sln Number.sln add ./Number.Tests/Number.Tests.csproj

Requirements

• NET Core SDK
• Visual Studio Code with some plugins:
  • .Net Core Test Explorer
  • C#
  • Coverage Gutter

Roman Numbers

Basic Symbols

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

Basic Combinations

1	2	3	4	5	6	7	8	9
I	II	III	IV	V	VI	VII	VIII	IX

10	20	30	40	50	60	70	80	90
X	XX	XXX	XL	L	LX	LXX	LXXX	XC

100	200	300	400	500	600	700	800	900
C	CC	CCC	CD	D	DC	DCC	DCCC	CM

How Convert

To convert Roman Numerals we need to split it up into place values (ones, tens, hundreds, etc.). Example 999

Place Value	Number	Roman Numeral
Hundreds	900	CM
Tens	90	XC
Ones	9	IX

You then combine them all together (starting from the top) to get CMXCIX.

Place Value

Expression	Place	Europe
1	ones
10	tens
100	hundreds
1,000	thousands
10,000	ten thousands
1,000,000	hundreds thousands
1,000,000	millions
10,000,000	ten millions
100,000,000	hundred millions
1,000,000,000	billions	milliards
1,000,000,000,000	trillions	billions