國立暨南國際大學 101 學年度第二學期小考試卷                   (考試時間: 14:10-14:20)

科目名稱：程式設計		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	2013.3.12

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).
   // Overloading the Assignment Operator
   #include <iostream>
   using std::endl;
   using std::cout;
   
   class CData
   {
       public:
           int* pdata;
   
       CData(int n=0)
       {
           pdata = new(int);
           *pdata = n;
           cout << "Constructor called with initial value " << n << endl;
       }
   
       ~CData()
       {
           cout << "Destructor called to release the memory storing "
                   << *pdata << endl;
           delete pdata;
       }
   
       CData& operator=(const CData& d)
       {
           if (this == &d)
              return *this;
           delete pdata;
           pdata = new int;
           *pdata = *(d.pdata);
           return *this;
       }
   };
   
   
   int main()
   {
       CData a(3);
       CData b;
       CData c(8);
       a = b = c;
       cout << *(a.pdata) << 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).
   // Signature of Overloading Functions
   #include <iostream>
   using std::endl;
   using std::cout;
   
   class CData
   {
       public:
           int* pdata;
   
       explicit CData(int n=0)
       // What will happen if we omit "explicit"?
       {
           pdata = new(int);
           *pdata = n;
       }
   
       ~CData()
       {
           delete pdata;
       }
   
       bool operator!=(const CData& d)
       {
           return *pdata != *(d.pdata);
       }
   };
   
   
   int main()
   {
       CData a(3);
       CData b(8);
       CData c(8);
       if (a != b) cout << "Not Equal.\n";
       if (b != 5) cout << "True.\n";
       return 0;
   }