Lab 4 Prelab Questions

1. Describe how a class and a struct differ?

2. Describe the differences between public and private in reference to classes.

3. Describe what a constructor is and how is it used? Give an example of a
constructor being used.

4. Describe what a destructor is and how is it used? Give an example of a
destructor being used.

5. Create a class called dog with private data members of a name and age.
The constructor should give a blank name, and an age of 0. Create the
following public functions: get an age, age the dog by one year, get
the name, and set the name.

6. Describe what is wrong with the following code:

 class rectangle
 {

      int length;
      int breadth;

   public:

      int area() { return length * breadth; }

 };

 int main()
 {
     rectangle rect;
     rect.length = 5;
     rect.breadth = 4;

     int rect_area = rect.area();

 }

7. How would you fix the errors in example 6 (Hint: Think of accessor and
mutator functions)

8. Will the following code compile? If yes why? If not, how will you fix it?

 class vehicle
 {

  public:

      void start();
      void stop();

  private:

      int speed;
      int doors;

      vehicle(int s, int d) {
      speed = s;
      doors = d;
      }
 };

9. Write a class to represent a car, similar to above class. Write a
constructor for this class, which will set the number of doors to 2 and
speed to 0.  Now create a instance of this class in the main function.

10. Consider the following code:

  class book {

      int pages;

      public:
              void book(int p)
              {
                      pages = p;
                }
  };

  Describe what is wrong with the above code?  Write the code that would fix
the above code.