Contents:

• Overview
• Practice Problems
• Problems to be Submitted
• Extra Credit

Topic: Object-Oriented Programming
Related Reading: Ch. 1
Due: 9:30am Thursday, 2 September 2004

Please make sure you adhere to the policies on academic integrity.

• Reinforcement Exercise R-1.1 of the text.

• Consider the following class declaration:

    class Top {
      public:
        Top ();
        int look();
      private:
        int value;
        void change(int v);
    }
  

  For each of the commented statements below, indicated whether they are legal or illegal.

    int main() {
      Top t;
      t.value = 3;       // legal or illegal?
      int k = t.look();  // legal or illegal?
      t.change(3);       // legal or illegal?
      return 0;
    }
  

1. (6 points)

   Reinforcement Exercise R-1.2 on page 57 of the text.

2. (6 points)

   What (if anything) is different about the behavior of the following three functions f(), g() and h()?

     void f(int x) {
       x = x + 1;
       cout << x;
     }
     
     void g(int& x) {
       x = x + 1;
       cout << x;
     }
     
     void h(const int& x) {
       x = x + 1;
       cout << x;
     }
     
   

3. (8 points)

   Suppose your program contains the following class definition:

     class Automobile {
     public:
       void setPrice(double newPrice);
       void setProfit(double newProfit);
       double getPrice();
     private:
       double price;
       double profit;
       double getProfit();
     };
   

   and assume that the main part of your program contains the following declarations, and that a constructor sets all values to all member variables to some default values.

     Automobile hyundai, jaguar;
     double aPrice, aProfit;
   

   Which of the following statements are allowed?
   1. hyundai.price = 4999.99;
   2. jaguar.profit = 4000.00;
   3. jaguar.setPrice(30000.97);
   4. aPrice = jaguar.getPrice();
   5. aProfit = jaguar.getProfit();
   6. aProfit = hyundai.getProfit();
   7. if (hyundai==jaguar) cout << "Want to swap cars?";
   8. hyundai = jaguar;