Write a full class definition for a class named Counter , and containing the following members:   A data member counter of type int . A constructor that takes one int argument and assigns its value to counter . A function called increment that accepts no parameters and returns no value. increment adds one to the counter data member. A function called decrement that accepts no parameters and returns no value. decrement subtracts one to the counter data member. A function called getValue that accepts no parameters. It returns the value of the instance variable counter .

C++

C- Create the sub class UsedBook  that is derived from the super class Book and has the following instance variables, constructor, and functions: title ( String) isbn ( String) authors (String) publisher (String) edition ( int) published_year (int) price_new (double) // the price of the book if it is new age (int)  // how old the book is in years Constructor that takes all of the above variables as input parameters.  set/get functions calculate_price method // the price is calculated as  price_new * (1- 0.10*age) print function that prints all information related to the old book.   D- Create the Testing class that has the main method and does the following: aa- Use the constructor to create instance of NewBook class and name it as new. Call compute_price function. bb- Use the constructor to create instance of  usedBook class and name it used. Call compute_price function. cc- Print the related information of new and used objects using print functions. Use this following code:   class…

In C++