fig10.6

Date.h

#pragma once#include<array>#include<iostream>class Date{friend std::ostream &operator<<(std::ostream &, const Date &);public:Date(int m = 1, int d = 1, int y = 1900);void setDate(int, int, int);Date &operator++();Date operator++(int);Date &operator+=(unsigned int);static bool leapYear(int);bool endOfMonth(int) const;private:unsigned int month;unsigned int day;unsigned int year;static const std::array<unsigned int, 13>days;void helpIncrement();};

Date.cpp

#include<iostream>#include<string>#include"Date.h"using namespace std;const array<unsigned int, 13>Date::days ={ 0,31,28,31,30,31,30,31,31,30,31,30,31 };Date::Date(int month, int day, int year){setDate(month, day, year);}void Date::setDate(int mm, int dd, int yy){if (mm >= 1 && mm <= 12)month = mm;elsethrow invalid_argument("Month must be 1-12");if (yy >= 1900 && yy <= 2100)year = yy;elsethrow invalid_argument("Year must be >= 1900 and <= 2100");if ((month == 2 && leapYear(year) && dd >= 1 && dd <= 29) ||(dd >= 1 && dd <= days[month]))day = dd;elsethrow invalid_argument("Day is out of range for current month and year");}Date &Date::operator++(){helpIncrement();return *this;}Date Date::operator++(int){Date temp = *this;helpIncrement();return temp;}Date &Date::operator+=(unsigned int additionalDays){for (int i = 0; i < additionalDays; ++i)helpIncrement();return *this;}bool Date::leapYear(int testYear){if (testYear % 400 == 0 ||(testYear % 100 != 0 && testYear % 4 == 0))return true;elsereturn false;}bool Date::endOfMonth(int testDay) const{if (month == 2 && leapYear(year))return testDay == 29;elsereturn testDay == days[month];}void Date::helpIncrement(){if (!endOfMonth(day))++day;elseif (month < 12){++month;day = 1;}else{++year;month = 1;day = 1;}}ostream &operator<<(ostream &output, const Date &d){static string monthName[13] = { "", "January","February","March", "April","May","June","July","August","September", "October","November","December" };output << monthName[d.month] <<' '<< d.day << ", " << d.year;return output;}

fig10_08.cpp

#include<iostream>#include"Date.h"using namespace std;int main(){Date d1(12, 27, 2010);Date d2;cout << "d1 is " << d1 << "\nd2 is " << d2;cout << "\n\nd1 += 7 is " << (d1 += 7);d2.setDate(2, 28, 2008);cout << "\n\n d2 is " << d2;cout << "\n++d2 is " << ++d2 << "(leap year allows 29th)";Date d3(7, 13, 2010);cout << "\n\nTesting the prefix increment operator:\n"<< " d3 is " << d3 << endl;cout << "++d3 is " << ++d3 << endl;cout << " d3 is " << d3;cout <<"\n\nTesting the postfix increment operator:\n"<<" d3 is " << d3 << endl;cout << "d3++ is" << d3++ << endl;cout << " d3 is " << d3 << endl;}