Ch11 11.8 Case Study: A date class

[AppleRich91]

So I am working on the date.h, date.cpp, and the main date project files and I just wanted to know using the 11.8 program code how can I add overloaded operator for "--" (pre and post), "-=", and ">>". For ">>", user expected to type in the format of "mm/dd/yyyy".(the code already prints out mm/dd/yyyy but need it for cin)