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  1. //: C14:Useful.h
  2. // From Thinking in C++, 2nd Edition
  3. // Available at http://www.BruceEckel.com
  4. // (c) Bruce Eckel 1999
  5. // Copyright notice in Copyright.txt
  6. // A class to reuse
  7. #ifndef USEFUL_H
  8. #define USEFUL_H
  9.  
  10. class X {
  11.   int i;
  12. public:
  13.   X() { i = 0; }
  14.   void set(int ii) { i = ii; }
  15.   int read() const { return i; }
  16.   int permute() { return i = i * 47; }
  17. };
  18. #endif // USEFUL_H ///:~
  19.