國立暨南國際大學 100 學年度第二學期小考試卷                   (考試時間: 13:30-13:40)
科目名稱：資訊系統 與網路導論 開課系所：資訊工程 學系 任課教師
 吳坤熹
系所別：
 年級：
 學號：
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 考試日期
 2012.3.28
  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).
     
    // Copy Constructor
    #include <iostream>
    using std::cout;

    class CRational
    {
        int numerator;
        int *denominator;

    public:
        CRational(int n, int d = 1): numerator(n)
        { denominator = new int(d); }

        void Print()
        { cout << numerator << '/' << *denominator; }
    };

    int main()
    {
        CRational a(1,2);
        CRational b(a);
        a = CRational(1,3);
        b.Print();
        return 0;
    }


  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;

    class CRational
    {
        int numerator;
        int denominator;

    public:
        CRational(int n=0, int d=1): numerator(n), denominator(d) {}

        void operator=(CRational a) // What should be the return type?
        { numerator   = a.numerator;
          denominator = a.denominator;
        }

        void Print()
        { cout << numerator << '/' << denominator; }
    };

    int main()
    {
        CRational a(1,2);
        CRational b;
        b = a;
        b.Print();
        return 0;
    }