國立暨南國際大學 97 學年度第二學期小考試卷

(考試時間: 14:10-14:20)

1. (10%) Determine whether the following code has syntax errors or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).

   // Virtual Function
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CCounter          // Pure Virtual Function
   {
   protected:
           int counter;
           virtual void Put(int i) = 0;
           int Get() { return counter; }
   public:
           void Init(int i) { Put(i); }
           void Show() { cout << Get() << "\n"; }
   };
   
   class CBigCounter : public CCounter
   {
   protected:
           virtual void Put(int i) { counter = i * 10; }
   public:
   
   };
   
   int main()
   {
           CCounter c1;
           CBigCounter c2;
           c1.Init(5);     c1.Show();
           c2.Init(5);     c2.Show();
   }