國立暨南國際大學 99 學年度第二學期小考試卷

(考試時間: 10:30-10:45)

1. (10%) Determine whether the following code has syntax erros or not.  If it is correct, predict its output.  If it is
   incorrect, point out the mistake(s).
   
   // Ex9_01.cpp
   // Using a derived class
   #include <iostream>                    // For stream I/O
   #include <cstring>                     // For strlen() and strcpy()
   
   class CBox
   {
     public:
       double m_Length;
       double m_Width;
       double m_Height;
   
       CBox(double lv = 1.0, double wv = 1.0, double hv = 1.0):
                                   m_Length(lv), m_Width(wv), m_Height(hv){}
   };
   
   class CCandyBox: CBox
   {  public:
       char m_Contents[10];
   
       CCandyBox(char* str = "Candy")               // Constructor
       {     
         strcpy_s(m_Contents, 10, str);
       }
   };
   
   
   using std::cout;
   using std::endl;
   
   int main()
   {
     CBox myBox(4.0, 3.0, 2.0);                     // Create CBox object
     CCandyBox myCandyBox;
     CCandyBox myMintBox("Wafer");       // Create CCandyBox object
   
     cout << endl
          << "myBox occupies " << sizeof myBox      // Show how much memory
          << " bytes" << endl                       // the objects require
          << "myCandyBox occupies " << sizeof myCandyBox
           << " bytes" << endl
          << "myMintBox occupies " << sizeof myMintBox
          << " bytes";
   
     cout << endl
          << "myBox length is " << myBox.m_Length;
   
     myBox.m_Length = 10.0;
   
     cout << endl;
     return 0;
   }
   
   
   

2. (10%) Determine whether the following code has syntax erros or not.  If it is correct, predict its output.  If it is
   incorrect, point out the mistake(s).
   
   // Copy Constructor
   #include <iostream>
   using std::cout;
   
   class CBox
   {
   public:
           int volume;
           char* color;
           CBox(int v, char* c = "Violet"): volume(v)
           {
                   color = new char[strlen(c)];
                   strcpy(color, c);
           }
   };
   
   int main()
   {
           CBox cigar(10);
           CBox chocolate(cigar);
           cout << chocolate.color << "\n";
   }