國立暨南國際大學 103 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).
   
   // Define a Class
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CRational
   {
       int numerator;
       int denominator;
   };
   
   
   int main()
   {
       CRational A;
       A.numerator = 1;
       A.denominator = 3;
       cout << A.numerator << '/' << A.denominator << endl;
       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).
   
   // Constructor
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CRational
   {
       int numerator;
       int denominator;
   
   public:
       CRational(int p, int q = 1)
       {
           numerator = p; denominator = q;
           cout << numerator << '/' << denominator
                << " created." << endl;
       }
   };
   
   
   int main()
   {
       CRational A(1, 3);
       CRational B(2);
       return 0;
   }
   
   
3. (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).
   
   // Member Function
   #include <iostream>
   using std::cout;
   using std::endl;
   
   class CRational
   {
       int numerator;
       int denominator;
   
   public:
       CRational(int p, int q = 1)
       { numerator = p; denominator = q; }
       void Print()
       { cout << numerator << '/' << denominator << endl; }
   };
   
   
   int main()
   {
       CRational A(2, 5);
       Print(A);
       return 0;
   }