fig17_03.cpp

来自「包含了形形色色的c基本程序。」· C++ 代码 · 共 66 行

// Fig. 17.3: fig17_03.cpp
// Attempting to initialize a constant of
// a built-in data type with an assignment.
#include <iostream>

using std::cout;
using std::endl;

class Increment {
public:
   Increment( int c = 0, int i = 1 );
   void addIncrement() { count += increment; }
   void print() const;
private:
   int count;
   const int increment;
}; // end class Increment

// Constructor for class Increment
Increment::Increment( int c, int i )
{             // Constant member 'increment' is not initialized
   count = c;
   increment = i;  // ERROR: Cannot modify a const object
} // end Increment constructor

// Print the data
void Increment::print() const
{
   cout << "count = " << count
        << ", increment = " << increment << endl;
} // end function print

int main()
{
   Increment value( 10, 5 );

   cout << "Before incrementing: ";
   value.print();

   for ( int j = 0; j < 3; j++ ) {
      value.addIncrement();
      cout << "After increment " << j << ": ";
      value.print();
   } // end for

   return 0;
} // end function main




/**************************************************************************
 * (C) Copyright 1992-2004 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/