December 2020

What is wrong with the following code? (8)class classA //Line 1 protected: //Line 2 void setX(int a); //Line 3 //Postcondition: x = a; //Line 4 private: //Line 5 int x; //Line 6 ; //Line 7 . . . int main() //Line 8 //Line 9 classA aObject; //Line 10 aObject.setX(4); //Line 11 return 0; //Line 12 […]

Suppose that you have the declarations of Exercise 7. Write the definitions of the member functions of the classes circle and cylinder. Identify the member functions of the class cylinder that overrides the member functions of the class circle. (2, 3, 4) Consider the following class definition: class employee public: void setData(string n = “”,

Assume the definition of the classes employee and hourlyEmployee as given in Exercise 9. (2, 3, 4) a. After identifying and correcting errors in the definition of the class hourlyEmployee, give its correct definition. b. Determine whether the function setPay of the class hourlyEmployee overrides or overloads the function setPay of the class employee. c.

Suppose that class three is derived from class two and class two is derived from class one and each class has instance variables. Suppose that an object of class three enters its scope, so the constructors of these classes will execute. Determine the order in which the constructors of these classes will execute. (4)

Explain the difference between overriding and overloading a member function of a base class in a derived class. (3) Suppose class two is derived from class one. To avoid multiple inclusion of these classes, which preprocessor directives are used in the header files containing the definitions of these classes. Justify your answer by giving an

Assume the definitions of the classes smart and superSmart as given in Exercise 14.  Suppose that the following statements are in a user program (client code): smart smartObject; superSmart superSmartObject; Mark the following statements as valid or invalid. If a statement is invalid, explain why. (2, 3, 4) a. int smart::sum()     return x +

Assume the declaration of Exercise 14. (3, 4) a. Write the definition of the default constructor of smart so that the instance variables of smart are initialized to 0. b. Write the definition of the default constructor of superSmart so that the instance variables of superSmart are initialized to 0. c. Write the definition of

a. The class ifstream is derived from which class? (7)b. The class ofstream is derived from which class? (7) Explain how in a private inheritance, the members of the base class are inherited by a derived class. (8) Explain how in a protected inheritance, the members of the base class are inherited by a derived

Explain how in a public inheritance, the members of the base class are inherited by a derived class. (8) Explain the difference between the private and protected members of a class. (8) Explain the difference between the protected and public members of a class. (8) Assume the declaration of Exercise 24. (8) a. Write the

Consider the following class definition: (8) class base  public:    void setXYZ(int a, int b, int c);     void setX(int a);     int getX() const    return x;       void setY(int b);      int getY() const  return y;       int mystryNum()    return (x * y – z * z);           void print()