Write the declaration for class D , which is derived from cl…
Questions
Write the declаrаtiоn fоr clаss D , which is derived frоm class B in the former question . The class’s membersshould be:• q , a float . This variable should not be accessible to code outside the class but should be accessible to member functions in any class derived from class D .• r , a float . This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class D .• setQ , getQ , setR , and getR . These are the set and get functions for the member variables q and r . These functions should be accessible to code outside the class.• calc , a public member function that overrides the base class calc function. This function should return the value of q times r .