[C++] An OOP programmer would like to design a class object. Define the prototypes of following member functions in this class.?

An OOP programmer would like to design a class object to hold student id and his/her CGPA result, named stdCGPA. Define the prototypes of following member functions in this class.

i) Default Constructor
ii) Copy Constructor
iii) String-conversion Constructor
iv) Destructor

Thank you very much !!!