programs for integer to roman number.

I want to know what is the roman number of 49 is it XLIX or IL.I participated in computer's fest they gave me program to convert integer to romans .I solved ,but they are saying roman number will be printing using nearest number technique of numbers.But from 3rd class i read only this.oN the internet site i saw also 49=XLIX,but they are saying 49=IL.please help me to solve this issue........