Roman Numeral Converter

freeCodeCamp's Roman Numeral Converter project for the JavaScript certification track.

Build a Roman Numeral Converter

Roman numerals are based on seven symbols and can be written using various combinations to represent Arabic numerals. For example:

Roman numerals	Arabic numerals
M	1000
CM	900
D	500
CD	400
C	100
XC	90
L	50
XL	40
X	10
IX	9
V	5
IV	4
I	1

Objective: Build an app that is functionally similar to https://roman-numeral-converter.freecodecamp.rocks

User Stories:

1. You should have an input element with an id of "number" √
2. You should have a button element with an id of "convert-btn" √
3. You should have a div element with an id of output √
4. When you click on the #convert-btn element without entering a value into the #number element, the #output element should contain the text "Please enter a valid number" √
5. When the #number element contains the number -1 and the #convert-btn element is clicked, the #output element should contain the text "Please enter a number greater than or equal to 1" √
6. When the #number element contains the number 4000 or greater and the #convert-btn element is clicked, the #output element should contain the text "Please enter a number less than or equal to 3999" √
7. When the #number element contains the number 9 and the #convert-btn element is clicked, the #output element should contain the text "IX" √
8. When the #number element contains the number 16 and the #convert-btn element is clicked, the #output element should contain the text "XVI" √
9. When the #number element contains the number 649 and the #convert-btn element is clicked, the #output element should contain the text "DCXLIX" √
10. When the #number element contains the number 1023 and the #convert-btn element is clicked, the #output element should contain the text "MXXIII" √
11. When the #number element contains the number 3999 and the #convert-btn element is clicked, the #output element should contain the text "MMMCMXCIX" √

Fulfill the user stories and pass all the tests below to complete this project. Give it your own personal style. Happy Coding!