Integer to Roman
Problem
Given an integer, convert it to a roman numeral.
The number is guaranteed to be within the range from 1 to 3999.
Example
4 -> IV
12 -> XII
21 -> XXI
99 -> XCIX
More examples at: http://literacy.kent.edu/Minigrants/Cinci/romanchart.htm
Note
What is Roman Numeral?