# Roman Numerals in OCaml

#### Write a function to convert from normal numbers to Roman Numerals.

1 | ```
exercism fetch ocaml roman-numerals
``` |

# Roman Numerals

Write a function to convert from normal numbers to Roman Numerals.

The Romans were a clever bunch. They conquered most of Europe and ruled it for hundreds of years. They invented concrete and straight roads and even bikinis. One thing they never discovered though was the number zero. This made writing and dating extensive histories of their exploits slightly more challenging, but the system of numbers they came up with is still in use today. For example the BBC uses Roman numerals to date their programmes.

The Romans wrote numbers using letters - I, V, X, L, C, D, M. (notice these letters have lots of straight lines and are hence easy to hack into stone tablets).

There is no need to be able to convert numbers larger than about 3000. (The Romans themselves didn't tend to go any higher)

Wikipedia says: Modern Roman numerals ... are written by expressing each digit separately starting with the left most digit and skipping any digit with a value of zero.

To see this in practice, consider the example of 1990.

In Roman numerals 1990 is MCMXC:

1000=M 900=CM 90=XC

2008 is written as MMVIII:

2000=MM 8=VIII

See also: http://www.novaroma.org/via_romana/numbers.html

## Getting Started

For installation and learning resources, refer to the exercism help page.

## Installation

To work on the exercises, you will need `Opam`

and `Core`

. Consult opam website for instructions on how to install `opam`

for your OS. Once `opam`

is installed open a terminal window and run the following command to install core:

1 |
```
opam install core
``` |

To run the tests you will need `OUnit`

. Install it using `opam`

:

1 |
```
opam install ounit
``` |

## Running Tests

A Makefile is provided with a default target to compile your solution and run the tests. At the command line, type:

1 |
```
make
``` |

## Interactive Shell

`utop`

is a command line program which allows you to run Ocaml code interactively. The easiest way to install it is via opam:

1 |
```
opam install utop
``` |

Consult utop for more detail.

## Feedback, Issues, Pull Requests

The exercism/ocaml repository on GitHub is the home for all of the Ocaml exercises.

If you have feedback about an exercise, or want to help implementing a new one, head over there and create an issue. We'll do our best to help you!

## Source

The Roman Numeral Kata http://codingdojo.org/cgi-bin/index.pl?KataRomanNumerals

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.