/* Code for exercise 5.13. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*//* Notes:This is not a complete program. It just shows a possible "Date"structure and some functions to process it.This file is extended to a comlete program in Ch7/ex7_19.cpp.*/#include <iostream>#include <stdlib.h>struct Date {   unsigned day_: 5; // Bitfield: use only 5 bits to                    //  represent this integer member   unsigned month_: 4;   int year_: 15;};std::istream& operator>>(std::istream &input, Date &d) {   int const bufsize = 6;   char buffer[bufsize];   input.getline(buffer, bufsize, '/');   d.month_ = atoi(buffer);   input.getline(buffer, bufsize, '/');   d.day_ = atoi(buffer);   int y;   input >> y;   d.year_ = y;    return input;}std::ostream& operator<<(std::ostream &output, Date &d) {   output << d.month_ << '/' << d.day_ << '/' << d.year_;   return output;}Date& init(Date &d, unsigned day, unsigned month, int year) {   d.day_ = day;   d.month_ = month;   d.year_ = year;   return d;}