國立暨南國際大學 102 學年度第二學期小考試卷

1. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   // Accessing the Data Members of a Class    (P.367)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CCircle
   {
       int x;
       int y;
       int r;
   };
   
   int main()
   {
       CCircle aCircle;
       aCircle.x = 10;
       aCircle.y = 10;
       aCircle.r = 5;
       cout << aCircle.x + aCircle.y + aCircle.r << endl;
       return 0;
   }
   
   
   
2. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   // Class Constructors (P.374)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CCircle
   {
   public:
       int x;
       int y;
       int r;
   
       CCircle(int a, int b, int c)
       {
           x = a;
           y = b;
           r = y;
       }
   };
   
   int main()
   {
       CCircle aCircle(10, 10, 5);
       cout << aCircle.x + aCircle.y + aCircle.r << endl;
       return 0;
   }
   
3. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   // Pointers to Class Objects (P.401)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CCircle
   {
   public:
       int x;
       int y;
       int r;
   
       CCircle(int a, int b, int c)
       {
           x = a;
           y = 5;
           r = c;
       }
   };
   
   int main()
   {
       CCircle aCircle(10, 10, 5);
       CCircle pCircle = &aCircle;
       cout << aCircle.x * pCircle->r << endl;
       return 0;
   }