How to implement the date class of C++ class and object

This article mainly introduces the C++ class and object date class how to achieve, the article is very detailed, has a certain reference value, interested friends must read it!

1. Laying the groundwork before realization

Before implementing, we need to write the class, which contains member functions and member variables.

For the date class, the copy construction and assignment operators don't have to be written, but it doesn't matter if I write it in the class.

# includeusing std::cout;using std::endl;using std::cin;class Date {public:// constructor Date (int year = 0, int month = 1, int day = 1) {if (year > = 0 & & month > 0 & & month0 & & day = inline bool operator > = (const Date& d); / / GetMonthDay (_ year, _ month)) {_ day-= GetMonthDay (_ year, _ month); _ month++; if (_ month > 12) {_ year++ _ month = 1;}} else {* this-= (- day);} return * this;} 2.2 date-= number of days

Here, like the + = operator overload function, it is necessary to determine whether the day is positive or negative.

Date& Date::operator-= (int day) {if (day > 0) {_ day-= day; while (_ day operator overload bool Date::operator > (const Date& d) {if (_ year > d._year) {return true;} else if (_ year = = d._year) {if (_ month > d._month) {return true } else if (_ month = = d._month) {if (_ day > d._day) {return true;} return false;} 2.10 = = operator overload bool Date::operator== (const Date& d) {return _ year = = d._year & & _ month = = d._month & & _ day = = d.daylight;} 2.11 > = operator overload

Here we begin to reuse the operator overload functions of > and = =

Bool Date::operator > = (const Date& d) {return (* this > d) | | (* this = = d);} 2.12d);} 2.13