國立暨南國際大學 97 學年度第二學期小考試卷

(考試時間: 14:10-14:30)

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).

   // Private Inheritance
   #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: private CBox
   {
     public:
       int m_nBottles;
       CCrate(int n = 12) : m_nBottles(n)                // Constructor
       { cout << "CCrate constructor called.\n"; }
   };
   
   class CBeerCrate: private 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";
   }
   
   
   
   
   
   
   
   
   
   

2.  (10%) Will it still be valid if the function header of the CBeerCrate::CBeerCrate() constructor modified as  
   
   CBeerCrate(const char* str = "Heineken")
   
   
   
   
   
   
   
   

3. (10%) Will it still be valid if the function header of the CBeerCrate::CBeerCrate() constructor modified as  
   
   CBeerCrate(const char* str = "Heineken") const