Final Exam
C++ Programming
NCNU CSIE

Date: June 23rd, 2009
Time: 08:30-10:30
Open book; turn off computer & mobile phone

1. 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).

   // modulus
   #include <iostream>
   using std::cout;
   using std::endl;
   
   int mod(int a, int b)
   {
   	do	a -= b;
   	while (a >= b);
   	return a;
   }
   
   int main()
   {
   	cout << mod(624, 7) << endl;
   }
   
   
   
   

2. 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).

   // Caesar Cipher
   #include <iostream>
   using std::cout;
   using std::endl;
   
   void encrypt(char* a, int key)
   {
   	while (*a)
   	{
   		if (*a >= 'A' AND *a <='Z')
   			*a = (*a - 'A' + key) % 26 + 'A';
   		a++;
   	}
   }
   
   int main()
   {
   	char msg[] = "HELLO NCNU";
   	encrypt(msg, 3);
   	cout << msg << "\n";
   }
   
   

3. 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).

   // Structure
   #include <iostream>
   using std::cout;
   
   struct Rectangle
   {
           int left;
           int top;
           int right;
           int bottom;
   };
   
   int main()
   {
           Rectangle R1(0,0,10,20);
           int area = (R1.right - R1.left) * (R1.bottom - R1.top);
   		cout << area << "\n";
   }
   
   

4. 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;
   
   class CBox
   {
   public:
           int volume;
           char* color;
           CBox(int v, char* c = "Violet"): volume(v)
           {
                   color = new char[strlen(c)];
                   strcpy(color, c);
           }
   		CBox(const CBox& b)
   		{
   			c = new char[strlen(b.color)];
   			strcpy(color, c);
   			volume = b.volume;
   		}
   };
   
   int main()
   {
           CBox cigar(10);
           CBox chocolate(cigar);
           cout << chocolate.color << "\n";
   }
   
   

5. 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 in a Derived Class
   #include <iostream>
   using std::cout;
   
   class CBox
   {
   
   public:
   int volume;
   CBox() { volume = 10; }
   
   };
   
   class CContainer : private CBox
   {
   
   char* color;
   public:
   CContainer()
   {
   

   color = new char[strlen("Violet")];
   strcpy(color, "Blue");
   

   }
   
   CContainer(CContainer& b)
   {
   

   color = new char[strlen(b.color)+1];
   strcpy(color, b.color);
   

   }
   
   void ShowColor()
   {
   

   cout << color << "\n";
   

   }
   
   };
   
   int main()
   {
   
   CContainer cigar;
   CContainer chocolate(cigar);
   chocolate.ShowColor();
   
   }
   
   
6. 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).

   // Operator Overloading
   #include <iostream>
   using std::cout;
   
   class CList
   {
   public:
           int count;
   		void Print() { cout << count << "\n"; }
           CList(int i) : count(i) {}
           CList& operator++() { count++; return *this; }
           CList operator++(int) { count<<=1; return *this; }
   };
   
   
   int main()
   {
           CList L2(5);        
           L2++; L2.Print();
   }
   
   

7. 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).

   
   // Friendship
   #include <iostream>
   using std::cout;
   
   class CBox
   {
   private:
           int volume;
   public:
           CBox() : volume(20) {};
   
   friend main();
   };
   
   int main()
   {   
       CBox b1;
       cout << b1.volume << "\n";
   }
   

8. What is a modeless dialog?  How does it behave differently from a modal dialog?

9. If we replace the OnDraw() function in P.715 as below, what result will be shown on the screen after you run the program?
   

   void CSketcherView::OnDraw(CDC* pDC)
   {
   	CSketcherDoc* pDoc = GetDocument();
   	ASSERT_VALID(pDoc);
   	if (!pDoc)
   		return;	
   	CList<CPoint, CPoint&> PointList;
   	PointList.AddTail(CPoint(50,30));
   	PointList.AddTail(CPoint(100,100));
   	PointList.AddTail(CPoint(150,30));
   	PointList.AddTail(CPoint(200,100));
   
   	
   	POSITION aPosition = PointList.GetHeadPosition();
   	if (aPosition)
   		pDC->MoveTo(PointList.GetNext(aPosition));
   	
   	PointList.GetNext(aPosition);
   	while (aPosition)	
   		pDC->LineTo(PointList.GetNext(aPosition));	
   }
   
   

10. If we replace the OnDraw()function in P.715 as below, what result will be shown on the screen after you run the program?
    
    void CSketcherView::OnDraw(CDC* pDC)
    {
        CSketcherDoc* pDoc = GetDocument();
        ASSERT_VALID(pDoc);
        if (!pDoc)
            return;   
        CList<CPoint, CPoint&> PointList;   
        PointList.AddTail(CPoint(100,100));
        PointList.AddTail(CPoint(150,30));
        PointList.AddHead(CPoint(50,30));
        PointList.AddTail(CPoint(200,100));
    
       
        POSITION aPosition = PointList.GetHeadPosition();
        if (aPosition)
            pDC->MoveTo(PointList.GetNext(aPosition));   
       
        while (aPosition)   
            pDC->LineTo(PointList.GetNext(aPosition));   
    }
    
    
    
11. In the movie "Mona Lisa Smiles", Katherine Ann Watson (played by Julia Roberts) moved from California to Massachusetts to teach Arts History in a new school.  What is the name of the school?  (5 points for Chinese answer; 10 points for English answer; 7 points for slightly incorrectly spelled English words)