國立暨南國際大學 97 學年度第二學期小考試卷

(考試時間: 14:10-14:30)

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).

   #include <iostream>
   using std::cout;
   
   class CCup
   {
   public:
       int water;
   
       CCup(int volume): water(volume) {};	// Constructor
   
       CCup& operator++ ()
       {
           ++water;
           return *this;
       }
   
       void Show()
       {
           cout << water << "\n";
       }
   };
   
   int main()
   {
       CCup juice(3);
       juice.Show();
       ++juice;
       juice.Show();
   }
   
   
   
   
   
   
   
   
   
   

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).
   
   // Operator Overloading
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CComplex
   {
   public:
           double real;
           double imaginary;
   
           CComplex(double a = 0.0, double b = 0):
           real(a), imaginary(b)
           { }
   
           void Show()
           {
                   cout << real;
                   if (imaginary<0.0)
                           cout << imaginary << "i";
                   else if
                           (imaginary > 0.0)
                           cout << "+" << imaginary << "i";
                   cout  << "\n";
           }
   
   };
   
   int main()
   {
           CComplex c1(2,3);
           CComplex c2(4,0);
           CComplex c3 = c1 + c2;
           c1.Show();
           c2.Show();              // "cout << 3.0" will display "3".
           c3.Show();
   }