The Class
First create your skeletal class structure, and declare its data members. You should at least have members to hold the numerator and denominator; use appropriate meaningful names, following class conventions. Remember data members should always be private. Then declare the functions that have access to the class members. This should be your output and reciprocal functions as well as your constructors. You don't have to have them exactly correct at this point--you will probably come back to fix them up after you've actually written the class functions.