声明一个Date类 重载运算符计算前一天和后一天日期 两个日期间的天数以及n天后的日期.doc

#includeiostream.h #includeCmath using namespace std; class Date {public: Date(int y,int m,int d):year(y),month(m),day(d){}//构造函数 void ymdoutput();//输出日期 Date operator++(int);//重载自增 求当前日期的下一天 Date operator--(int);//重载自减 求当前日期的前一天 long double zongriqi();//间接求两个日期(重载-号没有想出来) Date operator+(int);//重载+号 求n天后的日期 private: int year; int month; int day;}; void Date::ymdoutput() {Date d(year,month,day); coutd.year/d.month/d.dayendl;} Date Date::operator++(int) {if((month==4||month==6||month==9||month==11)day==30) {month++; day=1;} else if((month==1||month==3||month==5||month==7||month==8||month==10)day==31) {month++; day=1;} else if(month==12day==31) {year++; month=1; day=1;} else if(month==2) {if((year/4==0year/100!=0||year/400==0)day==29) {month++; day=1;} else if(day==28) {month++; day=1;}} else day++; return *this;} Date Date::operator--(int) {if((month-1==4||month-1==6||month-1==9||month-1==11)day==1) {month--; day=30;} else if((month-1==1||month-1==3||month-1==5||month-1==7||month-1==8||month-1==10)day==1) {month--; day=31;} else if(month==1day==1) {year--; month=12; day=31;} else if(month-1==2) {if((year/4==0year/100!=0||year/400==0)day==1) {month--; day=29;} else if(day==1) {month--; day=28;}} else day--; return *this;} long double Date::zongriqi() {long double s; int i; s=0; for(i=0;iyear;i++) {if(year/4==0year/100!=0||year/400==0) s=s+366; else s=s+365;} for(i=0;imonth;i++) {if(month==4||month==6||month==9||month==11) s=s+30; else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12) s=s+31; else if(month==2) {if(year/4==0year/100!=0||year/400==0) s=s+29; else s=s+28;}} s=s+day; return s;} Date Date::operator+(int n) {int i; for(i=1;i=n;i++) {if((month==1||month==3||month==5||month==7||month==8||month==10)day==31) {day=1; month++;} else if((month==4||month==6||month==9||month==11)day==30) {day=1; month++;} else if(month==12day==31) {day=1; month=1; year++;} else if(month==2) {if((year/4==0year/100!=0||year/400==0