國立暨南國際大學 98 學年度第一學期小考試卷

(考試時間: 14:10-14:30)

1. (10%) What value will the following code display?
   

   // Pass-by-value
   #include <iostream>
   using std::cout;
   using std::endl;
   
   void test(char p[])
   {  cout << ++p << endl;
   }
   
   int main()
   {
       char *name = "BASIC";
       test(++name);
       cout << name++ << endl;
       test(++name);
       cout << name++ << endl;
   }
   
   
   
   
   

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).

   // void function
   #include <iostream>
   using std::cout;
   using std::endl;
   
   void print_stars(int n);
   
   int main()
   {
       int j;
       for (j=1; j<6; j--)
           print_stars(j);
       return 0;
   }
   
   void print_stars(int n)
   {
       int i;
       for (i=0; i<n; i++)
           cout << "*";
       cout << endl;
       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).

   // static variable
   #include <iostream>
   using std::cout;
   using std::endl;
   
   void check(int n)
   {   static int s = 5;
       int t = 5;
       if (n>0)
       {
           s--;
           t--;
           check(n>>1);
       }
       else
       {
           cout << s << endl;
           cout << t << endl;
       }
   }
   
   int main()
   {
       check(12);
   }
   
   

4. (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).

   // Pass-by-reference
   #include <iostream>
   using std::cout;
   using std::endl;
   
   void print(int i, int j)
   {
       cout << "i = " << i << "\t j = " << j << endl;
   }
   
   void swap1(int a, int b)
   {   int temp;
       temp = a; a = b; b = temp;
   }
   void swap2(int &a, int &b)
   {   int temp;
       temp = a; a = b; b = temp;
   }
   void swap3(int &a, int b)
   {   int temp;
       temp = a; a = b; b = temp;
   }
   
   int main()
   {
       int i=3, j=2;
       swap1(i,j); print(i,j);
       swap2(i,j); print(i,j);
       swap3(i,j); print(i,j);
   }