國立暨南國際大學 96 學年度第二學期小考試卷

(考試時間: 8:10-8:30)
Open book; turn off computer & mobile phone

1. (10%) Point out the problem of the following code and use an example to explain why.
   

   // Header file CandyBox.h in project Ex9_01
   #pragma once
   #include "Box.h"
   class CCandyBox: CBox
   {
     public:
       char* m_Contents;
   
       CCandyBox(char* str = "Candy")               // Constructor
       {
         m_Contents = new char[ strlen(str) + 1 ];
         strcpy_s(m_Contents, strlen(m_Contents), str);
       }
   
       ~CCandyBox()                                 // Destructor
           { delete[] m_Contents; };
   };
   
   
   
      

2. (10%) What will be the output of the following code?

   #include <iostream>
   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 << endl << "CBox constructor called"; }
   	
   	~CBox() { cout << "CBox destructor called" << endl; }
   
   protected:
   	double m_Length;
   	double m_Width;
   	double m_Height;
   };
   
   class CCandyBox: public CBox
   {
   public: 
   	char* m_Contents;
   	CCandyBox(double lv, double wv, double hv, char* str = "Candy")
   		:CBox(lv, wv, hv)
   	{
   		cout << endl << "CCandyBox constructor called";
   		m_Contents = new char [ strlen(str) + 1 ];
   		strcpy_s(m_Contents, strlen(str) + 1, str);
   	}
   
   	~CCandyBox()
   	{
   		cout << "CCandyBox destructor called" << endl;
   	}
   };
   
   int main()
   {
   	CCandyBox myCandyBox(1, 2, 3);
   	CCandyBox myToffeeBox(2, 3, 4, "Stickjaw Toffee");
   	cout << endl;	
   }