1   // Fig. 7.2: fig07_02.cpp
2   // Using a member initializer to initialize a
3   // constant of a built-in data type.
4   
5   #include <iostream.h>
6   
7   class Increment {
8   public:
9      Increment( int c = 0, int i = 1 );
10     void addIncrement() { count += increment; }
11     void print() const;
12  
13  private:
14     int count;
15     const int increment;// const data member
16  };
17  
18  // Constructor for class Increment
19  Increment::Increment( int c, int i )
20     : increment( i )   // initializer for const member
21  { count = c; }
22  
23  // Print the data
24  void Increment::print() const
25  {
26     cout << "count = " << count
27          << ", increment = " << increment << endl;
28  }
29  
30  int main()
31  {
32     Increment value( 10, 5 );
33  
34     cout << "Before incrementing: ";
35     value.print();
36  
37     for ( int j = 0; j < 3; j++ ) {
38        value.addIncrement();
39        cout << "After increment " << j << ": ";
40        value.print();
41     }
42  
43     return 0;
44  }