Write the declaration for class \(B\). The class's members should be \(\bullet\) \(\mathrm{m},\) an integer. This variable should not be accessible to code outside the class or to member functions in any class derived from class B. \(\bullet\) \(\mathrm{n},\) an integer. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class B. \(\bullet\) setM, getM, setN, and getN. These are the set and get functions for the member variables m and n. These functions should be accessible to code outside the class. \(\bullet\) calc, a public virtual member function that returns the value of m times n. Next write the declaration for class \(\mathrm{D}\), which is derived from class \(\mathrm{B}\). The class's members should be \(\bullet\) \(\mathrm{q},\) 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 \(\mathrm{D}\) \(\bullet\) \(\mathrm{r},\) 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. \(\bullet\) 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. \(\bullet\) calc, a public member function that overrides the base class calc function. This function should return the value of q times \(r\)

Step by step solution

01

Class B Declaration

First, let's declare the class B. This class has two integer member variables with different accessibility levels, m and n. We will declare m as private and n as protected so that it is accessible by derived classes. We will add "set" and "get" member functions for m and n. Finally, we will add the public virtual member function "calc". ```cpp class B { private: int m; // Not accessible outside the class or any derived class protected: int n; // Not accessible outside, but accessible to derived classes public: // Setters and Getters void setM(int m_value); int getM() const; void setN(int n_value); int getN() const; // Public virtual member function virtual int calc() const; }; ```

02

Class D Declaration

Now, let's declare the class D. This class is derived from class B. It has two float data members with different accessibility levels, q, and r. Both should be declared as protected so that they are accessible by derived classes. We will add "set" and "get" member functions for q and r. Lastly, we will add the public member function "calc" that overrides the base class calc function. ```cpp class D : public B { protected: float q; // Not accessible outside, but accessible to derived classes float r; // Not accessible outside, but accessible to derived classes public: // Setters and Getters void setQ(float q_value); float getQ() const; void setR(float r_value); float getR() const; // Public member function that overrides the base class calc function int calc() const override; }; ``` Now we have our two class declarations, B and D, with the required data members, set/get functions, and calc functions.

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