How do i...write the program for this below description

Just a tip: you can override the default constructor of the class so that you can increment the static member variable, achieving the requested functionality.

Example of a class with default constructor defined, as well as a static member variable:

/* Here is the class definition */
class MyClass
{

public:

   /* Here is a parameterless constructor */
   MyClass() {
      /* Code of the constructor goes here */
   }

private:

   /* Here is a static member variable definition */
   static int count;

};

Apart from that, your assignment is pretty straightforward; if you do not understand some of technical terms, you should ask to your teacher. For example, for the most of us a static member variable is pretty self explanatory, but if you do not understand it you should get back to the basis and learn all those technical terms.