c++::实现一个日期类

来源：互联网发布：unknown网络编辑：程序博客网时间：2024/05/19 03:16

这里我实现一个简单的日期类吐舌头

#ifndef __TEST__#define __TEST__#include<iostream>using namespace std;class Date{friend ostream& operator<<(ostream& _cout,const Date& d);friend istream& operator>>(istream& _cin, Date& d);public:Date();Date(int year,int month,int day);Date& operator=(const Date& d);Date(const Date& d);~Date();int Getdaysinmonth(int year,int month);Date operator-(int days);int operator-(const Date& d);Date& operator++();Date operator++(int);bool operator>(const Date& d);bool operator<(const Date& d);bool operator==(const Date& d);bool operator!=(const Date& d);private:int _year;int _month;int _day;};#endif

#include"test.h"//构造函数Date::Date(){}Date::Date(int year=2000,int month=1,int day=1){_year = year;_month = month;_day = day;if((year<2000) || (month<=0) && (month>13) ||(day<0) && (day>Getdaysinmonth(year,month))){cout<<"输入不合法，请重新输入："<<endl;//cin>>"year:">>year>>"month:">>month>>"day:">>day>>endl;}else{cout<<"year: "<<year<<"month: "<<month<<"day: "<<day<<endl;}}//让天数合法化int Date::Getdaysinmonth(int year,int month){int days[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};if((((year%4==0) && (year%100 != 0))|| (year%400 == 0))&&(month == 2)){days[month] = 29;}return days[month];}//拷贝构造函数Date::Date(const Date &d){_year = d._year;_month = d._month;_day = d._day;}//赋值运算符重载Date& Date::operator=(const Date&d){if(this != &d){_year = d._year;_month = d._month;_day = d._day;}return *this;}Date::~Date(){cout<<"已被析构！"<<endl;}//减去一个任意天数Date Date::operator-(int days){if(days<0){days = 0-days;}Date temp(*this);temp._day-=days;while(temp._day<0){if(temp._month == 1){temp._month = 12;temp._day += 31;}else{--temp._month;temp._day += Getdaysinmonth(_year,temp._month);}}return temp;}//两个天数相减int Date::operator-(const Date& d){Date mindate(*this);Date maxdate(d);int count = 0;if(mindate>maxdate){std::swap(mindate,maxdate);}while(mindate<maxdate){(mindate._day)++;count++;}return count;}//天数的前置加加Date& Date::operator++(){++_day;return *this;}//天数的后置加加Date Date::operator++(int){Date temp(*this);temp._day = temp._day+1;//temp++;return temp;}//比较日期bool Date:: operator>(const Date& d){return ((_year>d._year)||((_year == d._year)&&(_month>d._month))||((_year == d._year)&&(_month==d._month)&&(_day>d._day)));}bool Date::operator<(const Date& d){return ((_year<d._year)||((_year == d._year)&&(_month<d._month))||((_year == d._year)&&(_month==d._month)&&(_day<d._day)));}bool Date::operator==(const Date& d){return ((_year == d._year) && (_month == d._month) &&(_day == d._day));}bool Date::operator!=(const Date& d){//return !(bool operator==(d));return ((_year!=d._year)||((_year == d._year)&&(_month!=d._month))||((_year == d._year)&&(_month==d._month)&&(_day!=_day)));}ostream& operator<<(ostream& _cout,const Date& d){_cout<<d._year<<" "<<d._month<<" "<<d._day;return _cout;}istream& operator>>(istream& _cin,Date& d){_cin>>d._year>>d._month>>d._day;return _cin;}

#include"test.h"//测试基本函数;构造。拷贝构造。赋值void test1(){Date d1(2013,4,5);Date d2(d1);Date d3(d1);d3 = d2;Date d4(1990,3,5);}//检查天数是否合法void test2(){Date d1;cout<<d1.Getdaysinmonth(2000,2)<<endl;cout<<d1.Getdaysinmonth(2013,2)<<endl;}//测试减去任意一个天数void test3(){Date d1(2014,5,6);d1= d1-30;cout<<d1<<endl;}//测试两个天数相减void test4(){Date d1(2014,3,5);Date d2(2014,3,30);cout<<d2-d1<<endl;}//测试比较void test5(){Date d1(2015,6,7);Date d2(2015,6,9);cout<<(d1<d2)<<endl;cout<<(d1>d2)<<endl;cout<<(d1==d2)<<endl;cout<<(d1!=d2)<<endl;}int main(){//test1();//test2();//test3();//test4();test5();return 0;}

0 2