國立暨南國際大學 98 學年度第二學期小考試卷

(考試時間: 14:10-14:25)

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).
   
   // Ex8_05a.cpp
   // Overloaded assignment operator for CBOX objects
   #include <iostream>
   using std::cout;
   
   class CBox
   {
       private:
           int weight;
       public:
           void ShowWeight() const
           { cout << weight << "\n"; }
   
           CBox(const int w = 0)   // Constructor definition
           { weight = w; }
   
           CBox operator=(const CBox& aBox)
           {
               if (this == &aBox)  // Check adresses, if equal
                   return *this;   // return the 1st operand
   
               // Copy 2nd operand to 1st
               weight = aBox.weight;
   
               return *this;
           }
   };
   
   int main()
   {
       CBox box1(10);
       CBox box2;
       CBox box3(box1);
       (box3 = box2) = box1;
       box3.ShowWeight();
       box3 = box2 = box1;
       box3.ShowWeight();
       return 0;
   }