國立暨南國際大學 108 學年度第二學期小考試卷

1. (10%) Determine whether the syntax of the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   // Function Overloading
   #include <iostream>
   
   class Rational {
   public:
       Rational(int n = 0, int d = 1)      // Constructor
       : numerator(n), denominator(d) {}
   
       Rational(Rational& b)                // same function name
       : numerator(b.numerator), denominator(b.denominator) {}
   
       void print() {
           std::cout << numerator << '/' << denominator << ' '; }
   
   private:
       int numerator;
       int denominator;
   };
   
   int main() {
       Rational a;
       Rational b(2);
       Rational c(1,2);
       Rational d(b);
       a.print(); b.print(); c.print(); d.print();
       return 0;
   }
   
   
   
2. (10%) Determine whether the syntax of the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   /* Destructor */
   #include <iostream>
   
   class Student {
   public:
       Student(char c) { name = c; }
       ~Student() { std::cout << "Destructor of " << name << " called.\n"; }
   private:
       char name;
   };
   
   void f1() { Student a('A'); }
   
   void f2() {
       Student b('B');
       f1();
   }
   
   int main()
   {
       f1();
       f2();
       return 0;
   }
   
   
   
   
3. (10%) Determine whether the syntax of the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   /* Friend Function */
   #include <iostream>
   using std::cin;
   using std::cout;
   using std::endl;
   
   class Student {
   public:
       Student(char s): name(s) {}
   private:
       char name;
   };
   
   void Teacher(Student a) {
       friend Student;
       cout << a.name << endl;
   }
   
   int main()
   {
       Student a('A');
       Teacher(a);
       return 0;
   }