國立暨南國際大學 102 學年度第二學期小考試卷

1. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   // Operator Overloading (P.446)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CData
   {
   public:
       int* pdata;
   
       CData(int v = 0)
       { pdata = new int(v); }
   
       CData Add(CData d)
       { return CData(*pdata - *d.pdata); }
   
       CData operator+(CData d)
       { return Add(d); }
   
       void Print()
       { cout << *pdata << endl; }
   };
   
   int main()
   {
       CData a(5), b(3);
       CData c;
       c = a + b;
       c.Print();
       return 0;
   }
   
   
   
2. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   // Overloading the Assignment Operator (P.454)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CData
   {
   public:
       int* pdata;
   
       CData(int v = 0)
       { pdata = new int(v); }
   
       CData operator=(CData d)
       { return CData( *d.pdata ); }
   
       void Print()
       { cout << *pdata << endl; }
   };
   
   int main()
   {
       CData a(5), b(3);
       CData c;
       c = a;
       a = b;
       c.Print();
       return 0;
   }