國立暨南國際大學 100 學年度第二學期小考試卷                   (考試時間: 8:10-8:20)

科目名稱：資訊系統 與網路導論		開課系所：資訊工程 學系		任課教師	吳坤熹
系所別：	年級：	學號：	姓名：	考試日期	2012.3.9

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).
   // Ex7_12.cpp
   // Using a static data member in a class
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CBox             // Class definition at global scope
   {
     public:
       static int objectCount;    // Count of objects in existence
   
       // Constructor definition
       explicit CBox(double lv, double bv = 1.0, double hv = 1.0)
       {    
         m_Length = lv;           // Set values of
         m_Width = bv;            // data members
         m_Height = hv;
         objectCount = 0;
       }
   
       CBox()                     // Default constructor
       {    
         m_Length = m_Width = m_Height = 1.0;
         objectCount++;
       } 
   
     private:
       double m_Length;           // Length of a box in inches
       double m_Width;            // Width of a box in inches
       double m_Height;           // Height of a box in inches
   };
   
   int CBox::objectCount = 2;    
   // Initialize static member of CBox class
   
   int main()
   {
     CBox boxes[5];       // Array of CBox objects declared
     cout << "Number of objects (through class) = "
          << CBox::objectCount;
   
     CBox cigar(8.0, 5.0, 1.0);   // Declare cigar box
     cout << endl
          << "Number of objects (through object) = "
          << boxes[2].objectCount;
   
     cout << endl;
     return 0;
   }
   
   
   
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).
   // Copy Constructor
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CBox             // Class definition at global scope
   {
     public:
       // Constructor definition
       explicit CBox(double lv, double bv = 1.0, double hv = 1.0)
       {     
         m_Length = lv;           // Set values of
         m_Width = bv;            // data members
         m_Height = hv;
       }
   
       CBox(CBox& initB)
       {
           m_Length = initB.m_Length;
           m_Width = initB.m_Width;
           m_Height = initB.m_Height;
       }
   
     // private: // What would happen if data members are private?
       double m_Length;           // Length of a box in inches
       double m_Width;            // Width of a box in inches
       double m_Height;           // Height of a box in inches
   };
   
   int main()
   {
     CBox box1(8.0, 5.0, 1.0);   // Declare cigar box
     CBox box2(box1);
     CBox box3 = box2;  
     cout << box3.m_Width << endl;
     return 0;
   }