这次日期类的实现呢，主要具备查某月的日历，日期加减天数后是哪一天，两个日期之间相差的天数。比如说：你想知道离开学的日子还有多少天啊，离我们找工作还有多少天呐，这个月的日历是什么样的啊都可以它来查询！
下面给出代码实现：
Date.h #ifndef _DATE__H_ #define _DATE__H_ #include<cstdio> #include<iostream> using namespace std; class Date { friend void PrintDate(int year,int month); public: Date(int year,int month,int day); Date(const Date& d); bool JudgeLeapyear(int year)const; int SetDay(const Date& d); //设置每月的天数并返回是哪个月 Date operator+(int day); //日期加天数 Date operator-(int day); //日期减天数 int operator-(const Date& date); //日期减日期(相差天数) int Week(int year,int month); //计算当前月的第一天是星期几 void Display(); bool operator==(const Date& d); bool operator>(const Date& d); Date& operator=(const Date& d); private: int _year; int _month; int _day; }; void PrintDate(int year,int month);//打印该月日历 #endif //_DATE__H_ Date.cpp #include"Date.h" Date::Date(int year=1990,int month=1,int day=1) :_year(year), _month(month), _day(day) { if(month>12 ||day>SetDay(*this)) { cout<<"输入日期不合法！"<<endl; } } Date::Date(const Date& d) { _year=d._year; _month=d._month; _day=d._day; } bool Date::JudgeLeapyear(int year)const { if(((year%4==0)&&(year%100!=0))||(year%400==0)) { return true; } else { return false; } } int Date::SetDay(const Date& d) { int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; if(JudgeLeapyear(d._year)) { month[2]=29; } return month[d._month]; //返回是哪个月 } 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; } else return false; } else return false; } else return false; } bool Date::operator==(const Date& d) { if(_year==d._year && _month==d._month && _day==d._day) { return true; } else { return false; } } Date& Date::operator=(const Date& d) { if(*this==d) { return *this; } _year=d._year; _month=d._month; _day=d._day; return *this; } Date Date::operator+(int day) //日期加天数 { _day=_day+day; while(_day > SetDay(*this)) { _day=_day-SetDay(*this); _month++; if(_month>12) { _month=_month-12; _year++; } } return *this; } Date Date::operator-(int day) //日期减天数 { _day=_day-day; while(_day<=0) { _month--; if(_month<=0) { _month=_month+12; _year--; } _day=_day+SetDay(*this); } return *this; } int Date::operator-(const Date& date) //日期减日期 { int days=0; //统计相差几天 Date small(*this); Date big(date); if(*this>date) { big=*this; small=date; } while(big._year>small._year) { if(JudgeLeapyear(small._year)) { days=days+366; } else { days=days+365; } small._year++; } while(small._month>big._month) { days=days-SetDay(small); small._month--; } while(big._month>small._month) { days=days+SetDay(small); small._month++; } days=days+(big._day-small._day); if(*this>date) { return -days; } else return days; } int Date::Week(int year,int month) { if(year>=1600 && month>=1) { int week=6; //日历从1600.1.1开始该天是周六 int day=0; Date d1(1600,1,1); Date d2(year,month,1); day=d1-d2; //统计目标月份与起始月份相差的天数 week=day%7+week; if(week>7) { week=week-7; } return week; } return -1; } void PrintDate(int year,int month) { int i=0; //控制最多输出行 int j=0; //控制列 int day=1; Date d(year,month,1); int week=d.Week(year,month); if(week!=-1) { cout<<year<<"年"<<month<<"月"<<endl; cout<<"日"<<" "<<"一"<<" "<<"二"<<" "<<"三"<<" "<<"四"<<" "<<"五"<<" "<<"六"<<" "<<endl; for(j=0;j<week;j++) { cout<<" "; } for(i=0;i<6;i++) { for(j=week;j<7;j++) { if(day<=d.SetDay(d)) { printf("%3d",day); day++; } else break; } cout<<endl; week=0; } } else return; } void Date::Display() { cout<<_year<<"-"<<_month<<"-"<<_day<<endl; } test.cpp #include"Date.h" void test1() //加减天数 { Date d1(2014,9,1); d1.Display(); Date d2=d1+21; d2.Display(); Date d3=d1+60; d3.Display(); //Date d4=d1-50; //d4.Display(); } void test2() { int ret; Date d1(2011,1,2); d1.Display(); Date d2(2016,1,1); d2.Display(); ret=d1-d2; cout<< "相差天数："<<ret<<endl; } void test3() { int year=0; int month=0; printf("%d%d",&year,&month); PrintDate(year,month); } int main() { //test1(); //test2(); test3(); system("pause"); return 0; }
