//file:date.h #include<iostream.h> class date { public:     date(){year=month=day=leapyear=pastdays=week=-1;};     date(int y,int m,int d);     int getweek(){return week;};     friend bool operator<(date& dt1,date& dt2);     friend long leapyearsbetween(date dt1,date dt2);     friend ostream& operator<<(ostream& out,date& dt);     friend long operator-(date dt1,date dt2);     date& operator+=(int days); protected:     int year,month,day;     int leapyear,pastdays,week; }; //file:date.cpp #include<iomanip.h> #include "date.h" date::date(int y,int m,int d) {     static int         r1[13]={0,31,28,31,30,31,30,31,31,30,31,30,31},         r2[13]={0,0,3,3,6,1,4,6,2,5,0,3,5},         r3[13]={0,0,31,59,90,120,151,181,212,243,273,304,334};     int c;     if(y<0||m<1||m>12||d<1)     {         cerr<<"Wrong Date!"<<endl;         year=month=day=leapyear=pastdays=week=-1;         return;     }     if(y%4==0&&y%100!=0||y%400==0)leapyear=1;     else leapyear=0;     if(d>r1[m]+(m==2?leapyear:0))     {         cerr<<"Wrong Date!"<<endl;         year=month=day=leapyear=pastdays=week=-1;         return;     }     year=y;month=m;day=d;//日期数据约束条件     y%=400;     if(leapyear&&m<3)c=5;     else c=6;     week=(y+y/4-y/100+r2[m]+d+c)%7;     pastdays=r3[m]+d;     if(leapyear&&m>2)++pastdays; } ostream& operator<<(ostream& out,date& dt) {     out<<setw(4)<<dt.year<<"/"         <<setw(2)<<setfill('0')<<dt.month<<"/"         <<setw(2)<<setfill('0')<<dt.day;     return out; } bool operator<(date& dt1,date& dt2) {     if(dt1.year<dt2.year)return true;     if(dt1.year>dt2.year)return false;     if(dt1.month<dt2.month)return true;     if(dt1.month>dt2.month)return false;     if(dt1.day<dt2.day)return true;     return false; } long leapyearsbetween(date dt1,date dt2)//dt1<dt2 {     long y1=dt1.year,y2=dt2.year-1;     long lys;     for(;!(y1%4==0&&y1%100!=0||y1%400==0);++y1);     if(y1>y2)return 0;     for(lys=0;y1<=y2;y1+=4)         if(y1%100!=0||y1%400==0)++lys;     return lys; } long operator-(date dt1,date dt2) {     long sign=1;     if(dt1<dt2)     {date temp=dt1;dt1=dt2;dt2=temp;sign=-1;}     long lys=leapyearsbetween(dt2,dt1);     return sign*((dt1.year-dt2.year)*365+lys+dt1.pastdays-dt2.pastdays); } date& date::operator+=(int days)//后数天数 {     static int r[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};     int t;     if(days>=(t=366+leapyear-pastdays))     {         days-=t;         ++year;month=day=1;     }     while(days>(t=365+leapyear))     {         days-=t;         ++year;     }     while(days>=r[month]+(month==2&&leapyear?1:0))     {         days-=r[month]+(month==2&&leapyear?1:0);         ++month;     }     day+=days;     if(day>r[month]+(month==2&&leapyear?1:0)){day-=r[month]+(month==2&&leapyear?1:0);++month;}     if(month>12){month=1;++year;}     return *this; } //file:test.cpp #include "date.h" void main() {     int y,m,d;     date d1,d2;     cout<<"输入第一个日期：年月日"<<endl;     cin>>y>>m>>d;     d1=date(y,m,d);     while(1)     {     cout<<"输入后数天数："<<endl;     cin>>d;if(d==-1)break;     d1+=d;     cout<<"到"<<d1<<endl;     } }

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