对于实现日期类中需要用到的例如：构造函数，析构函数，运算符重载等内容，已经在前面几篇文章中进行介绍，故本文只给出关于类和对象中日期类的代码实现，对于代码的原理不给予详细的解释：

1.头文件violent.h：

#pragma once#include<stdio.h>
#include<iostream>
#include<assert.h>
#include<stdbool.h>using std::cout;
using std::cin;
using std::endl;class Date
{
public://构造函数：函数名与类名相同，没有返回值，可以构成重载，自动调用//针对内置类型不做处理，针对自定义类型会自动调用其自己的构造函数Date(int year = 1, int month = 1, int day = 1);//拷贝构造函数，对于日期类可以不写//拷贝构造函数针对内置类型会完成值拷贝，针对自定义类型会自动调用其自己的拷贝构造函数//Date(Date& d1)//{//	_year = 2024;//	_month = 1;//	_day = 6;//}//类的比较运算函数bool operator==(Date& d);bool operator!=(Date& d);bool operator>(Date& d);bool operator>=(Date& d);bool operator<=(Date& d);bool operator<(Date& d);//获取年月份对应的日期int GetMonthDay(int _year, int _month);void Print();Date& operator+=(int day);Date operator+(int day);Date& operator-=(int day);Date operator-(int day);Date& operator++();Date operator++(int);Date& operator--();Date operator--(int);int operator-(Date& d);//析构函数，不是清除对象，而是对对象中的资源进行清理，作用方式与构造函数类似，针对内置类型不作用//针对自定义类型会调用自己的析构函数//函数名是类名之前加上波浪线，每个类中只能存在一个析构函数，类生命周期结束会自动调用，不能构成重载~Date();private:int _year;int _month;int _day;
};

2.函数功能实现文件violent.c:

#define _CRT_SECURE_NO_WARNINGS 1#include"violent.h"//构造函数
Date::Date(int year, int month, int day)
{if ((year < 1) || (month > 12) || (month < 1) || (day < 1)){cout << "日期信息非法" << endl;}_year = year;_month = month;_day = day;
}
//析构函数
Date:: ~Date()
{_year = 0;_month = 0;_day = 0;
}void Date::Print()
{cout << _year << " " << _month << " " << _day << endl;
}
bool Date::operator==(Date& d)
{return _year == d._year && _month == d._month && _day == d._day;
}bool Date::operator!=(Date& d)
{return !(*this == d);
}bool Date::operator>(Date& d)
{if (_year > d._year){return true;}else if ((_year == d._year) && (_month > d._month)){return true;}else if ((_year == d._year) && (_month == d._month) && (_day > d._day)){return true;}else{return false;}
}bool Date::operator>=(Date& d)
{return ((*this > d) || (*this == d));
}bool Date::operator<=(Date& d)
{return !(*this > d);
}bool Date::operator<(Date& d)
{return !(*this >= d);}int Date::GetMonthDay(const int _year,const int _month)
{int Day[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };if ((_month == 2) && (((_year % 4 == 0) && (_year % 100 != 0)) || (_year % 400 == 0))){return 29;}return Day[_month];
}//运算符重载：+=（会改变类）
Date& Date::operator+=(int day)
{_day = _day + day;while(_day > GetMonthDay(_year,_month)){_day = _day - GetMonthDay(_year, _month);_month++;if (_month > 12){_month = 0;_year++;}}return (*this);
}Date Date::operator+(int day)
{Date tmp(*this);tmp = tmp += day;return tmp;
}Date& Date::operator-=(int day)
{_day = _day - day;while (_day <= 0){_month--;if (_month == 0){_year--;_month = 12;}_day = _day + GetMonthDay(_year, _month);	}return (*this);
}Date Date::operator-(int day)
{Date tmp(*this);tmp = (tmp -= day);return tmp;
}Date& Date::operator++()
{*this += 1;return (*this);
}Date Date::operator++(int)
{Date tmp = (*this);*this += 1;return tmp;
}Date& Date::operator--()
{*this -= 1;return (*this);
}Date Date::operator--(int)
{Date tmp(*this);(*this) -= 1;return tmp;
}int Date::operator-(Date& d)
{int flag = 1;Date max = (*this);Date min = (d);if ((*this) < d){max = d;min = (*this);flag = -1;}int n = 0;while (min != max){min++;n++;}return n * flag;
}

3.功能测试文件Test.c:

#define _CRT_SECURE_NO_WARNINGS 1#include"violent.h"void Test1()
{Date d1(2024,1,6);d1.Print();Date d2(2024, 1, 6);d2.Print();Date d3(2024, 1, 15);cout << "测试结果校验： ==" << endl;bool ret =(d1==d2);cout << " ret = " << ret << endl;cout << "测试结果校验： != " << endl;bool ret1 = (d2 != d1);cout << " ret1 = " << ret1 << endl;cout << "测试结果校验：>" << endl;bool ret2 = (d3 > d1);cout << " ret3 =  " << ret2 << endl;cout << "测试结果校验： >=" << endl;bool ret3 = (d3 >= d1);bool ret4 = (d2 >= d1);cout << " ret3 = " << ret3 << endl << "ret4 = " << ret4 << endl;cout << "测试结果校验： <=" << endl;bool ret5 = (d1 <= d3);bool ret6 = (d2 <= d1);cout << " ret5 = " << ret5 << endl << " ret6 = " << ret6 << endl;cout << "测试结果校验： <" << endl;bool ret7 = (d2 < d3);cout << "ret7 = " << ret7 << endl;
}void Test2()
{cout << endl << " 下面内容为Test2中的测试" << endl;Date dd(2024, 1, 6);dd.Print();Date dd1(2024, 1, 6);cout << "测试+=" << endl;Date ret1 = (dd += 100);ret1.Print();cout << "测试+" << endl;Date ret2 = (dd1 + 100);ret2.Print();cout << "测试-=" << endl;Date ret3 = (dd -= 100);ret3.Print();cout << "测试-" << endl;Date ret4 = (dd1 - 100);ret4.Print();
}void Test3()
{cout << endl << " 下面内容为Test3中的测试" << endl;Date d3(2024, 1, 6);cout << " 测试++d" << endl;Date ret1 = (++d3);Date d4(2024, 1, 6);ret1.Print();cout << " 测试d++" << endl;Date ret2 = (d4++);ret2.Print();
}void Test4()
{cout << endl << " 下面内容为Test4中的测试" << endl;Date d(2024, 1, 6);Date d2(2024, 1, 6);cout << "测试--d" << endl;Date ret1 = (--d);ret1.Print();cout << "测试d--" << endl;Date ret2 = (d2--);ret2.Print();
}void Test5()
{Date d1(2024, 1, 6);Date d2(2024, 4, 15);int ret1 = d2 - d1;cout << ret1 << endl;
}
int main()
{Test1();Test2();Test3();	Test4();Test5();
}

4. 代码运行结果展示：