國立暨南國際大學 97 學年度第二學期小考試卷

(考試時間: 8:10-8:30)

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).

   // Class Inheritance
   #include <iostream>
   #include <cstring>
   using std::cout;
   using std::endl;
   
   class CBox
   {
     public:
       CBox(double lv = 1.0, double wv = 2.0, double hv = 3.0):
                                m_Length(lv), m_Width(wv), m_Height(hv)
           { cout << "CBox constructor called.\n"; }
       double Volume() { return m_Length*m_Width*m_Height; }
     private:
       double m_Length;
       double m_Width;
       double m_Height;
   };
   
   class CCandyBox: public CBox
   {
     public:
       char* m_Contents;
   
       CCandyBox(char* str = "Candy")               // Constructor
       {
           m_Contents = new char[ strlen(str) + 1 ];
           strcpy(m_Contents, str);
           { cout << "CCandyBox constructor called.\n"; }
       }
   
       ~CCandyBox()                                 // Destructor
           { delete[] m_Contents; };
   };
   
   int main()
   {
       CCandyBox myMintBox("Wafer Thin Mints");
       cout << myMintBox.Volume() << "\n";
   }
   
   
   
   
   
   
   
   
   
   
   

2.  (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).
   
   // Constructor of the base part
   #include <iostream>
   #include <cstring>
   using std::cout;
   using std::endl;
   
   class CBox
   {
     public:
       CBox(double lv = 1.0, double wv = 1.0, double hv = 1.0):
                                m_Length(lv), m_Width(wv), m_Height(hv)
           { cout << "CBox constructor called.\n"; }
   
       double Volume() { return m_Length*m_Width*m_Height; }
   
     private:
       double m_Length;
       double m_Width;
       double m_Height;
   };
   
   class CCrate: public CBox
   {
     public:
       int m_nBottles;
       CCrate(int n = 12) : m_nBottles(n)                // Constructor
       { cout << "CCrate constructor called.\n"; }
   };
   
   class CBeerCrate: public CCrate
   {
     public:
       char* m_Beer;
       CBeerCrate(char* str = "Heineken") // Constructor
       {
           m_Beer = new char [ strlen(str) + 1 ];
           strcpy(m_Beer, str);
           cout << "CBeerCrate constructor called.\n";
       }
   
       ~CBeerCrate()
       {
           delete [] m_Beer;
       }
   };
   
   int main()
   {
       CBeerCrate myBeer("Taiwan Beer");
       cout << myBeer.m_Beer << "\n";
   }