國立暨南國際大學 99 學年度第二學期小考試卷

(考試時間: 16:30-16:45)

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).

   #include <iostream>
   using std::cout;
   
   class CStack
   {
   public:
           CStack()        // Default Constructor
           {
                   index = 0;
           }
           void push(int i)
           {
                   a[index++] = i;
           }
           int pop()
           {
                   return a[--index];
           }
   private:
           #define         StackSize       10
           int a[StackSize];
           int index;
   };
   
   int main() {
     CStack stack1;
     stack1.push(3); stack1.push(2);
     cout << stack1.a[1] << "\n";
   }
   
   
   

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).
   
   #include <iostream>			// Ex7_06.cpp
   using std::cout;
   using std::endl;
   
   class CBox                             // Class definition at global scope
   {
     public:
       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
   
       // Constructor definition
       CBox(double lv = 1.0, double bv, double hv = 1.0) // This line is different
       {
         cout << endl << "Constructor called.";
         m_Length = lv;                   // Set values of
         m_Width = bv;                    // data members
         m_Height = hv;
       }
   
       // Function to calculate the volume of a box
       double Volume()
       {
         return m_Length*m_Width*m_Height;
       }
   };
   
   int main()
   {
     CBox box2;                           // Declare box2 - no initial values
   
     cout << endl
          << "Volume of box2 = "
          << box2.Volume();
   
     cout << endl;
     return 0;
   }
   

3. (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).
   
   // 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
       CBox(double lv, double bv = 1.0, double hv = 1.0)
       {
         cout << endl << "Constructor called.";
         m_Length = lv;                   // Set values of
         m_Width = bv;                    // data members
         m_Height = hv;                   
         objectCount++;
       }
   
       CBox()                             // Default constructor
       {
         cout << endl
              << "Default constructor called.";
         m_Length = m_Width = m_Height = 1.0;
         objectCount++;
       }
   
       // Function to calculate the volume of a box
       double Volume() const
       {
         return m_Length*m_Width*m_Height;
       }
   
     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 = 0;             // Initialize static member of CBox class
   
   int main()
   {
     CBox boxes[5];                       // Array of CBox objects declared  
     cout << endl << endl
          << "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 << "Sizeof boxes[1] is " << sizeof boxes[1] << endl;
     return 0;
   }