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).
   
   // Defining a struct (P.268)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   struct Rectangle
   {
       short left;
       short top;
       short right;
       short bottom;
   };
   
   int main()
   {
       Rectangle aRect;
       cout << sizeof( Rectangle ) << endl;
       cout << sizeof( aRect ) << 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).
   
   // Accessing the Members of a struct (P.269)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   struct Rectangle
   {
       short left;
       short top;
       short right;
       short bottom;
   };
   
   int area(Rectangle aRect)
   {
       return (aRect.right - aRect.left) * (aRect.bottom - aRect.top);
   }
   
   void changeRect(Rectangle aRect)
   {
       aRect.left  += 50;
       aRect.right -= 50;
       cout << area(aRect) << endl;
   }
   
   int main()
   {
       Rectangle yard = { 100, 100, 300, 300 };
       changeRect( yard );
       cout << area( yard ) << 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).
   
   // Accessing Structure Members through a Pointer (P.275)
   #include <iostream>
   using std::cout;
   using std::endl;
   
   struct Rectangle
   {
       short left;
       short top;
       short right;
       short bottom;
   };
   
   int area(Rectangle aRect)
   {
       return (aRect.right - aRect.left) * (aRect.bottom - aRect.top);
   }
   
   void changeRect(Rectangle* pRect)
   {
       *pRect.left  += 50;
       *pRect.right -= 50;
       cout << area( *pRect ) << endl;
   }
   
   int main()
   {
       Rectangle yard = { 100, 100, 300, 300 };
       changeRect( &yard );
       cout << area( yard ) << endl;
       return 0;
   }