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:
文章来源:https://www.toymoban.com/news/detail-783664.html
文章来源地址https://www.toymoban.com/news/detail-783664.html
到了这里,关于C++类与对象基础(5)——日期类的实现的文章就介绍完了。如果您还想了解更多内容,请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章,希望大家以后多多支持TOY模板网!