完美版nextday程序。可以根据平年闰年智能算出明天日期

来源：互联网发布：台湾网络电视机顶盒编辑：程序博客网时间：2024/04/29 05:51

#include <iostream.h>
class Date
{
private:
int year,month,day;
public:
Date(){}
Date(int y,int m,int d);
void display()
{
cout<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
}
int isLeapyear(int y);
void nextday();
};
void Date::nextday()
{

   switch(month)
   {
   case 1:
   case 3:
   case 5:
   case 7:
   case 8:
   case 10:
   case 12:
     if((month==12)&&(day==31))
     {
    cout<<"当前日期为"<<day<<"年"<<month<<"月"<<day<<"日"<<endl;
    cout<<endl;
    cout<<"明天日期为："<<year+1<<"年"<<1<<"月"<<1<<"日"<<endl;
    cout<<endl;
     }

      else if(day==31)
   {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month+1<<"月"<<1<<"日"<<endl;
   cout<<endl;
   }

      else
   {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month<<"月"<<day+1<<"日"<<endl;
   cout<<endl;
   }
   break;

case 2:
if(isLeapyear(year))
  {

   if((month==12)&&(day==29))
  {
    cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
    cout<<endl;
    cout<<"明天日期为："<<year+1<<"年"<<1<<"月"<<1<<"日"<<endl;
    cout<<endl;
  }
  else if(day==29)
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month<<"月"<<1<<"日"<<endl;
   cout<<endl;
  }

  else
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
  }
  }
  else
  {
   if((month==12)&&(day==28))
  {
    cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
    cout<<endl;
    cout<<"明天日期为："<<year+1<<"年"<<1<<"月"<<1<<"日"<<endl;
    cout<<endl;
  }
  else if(day==28)
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month+1<<"月"<<1<<"日"<<endl;
   cout<<endl;
  }

  else
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
  }
  }
  break;
case4:
case6:
case9:
case11:

   if((month==12)&&(day==30))
  {
    cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
    cout<<endl;
    cout<<"明天日期为："<<year+1<<"年"<<1<<"月"<<1<<"日"<<endl;
    cout<<endl;
  }
  else if(day==30)
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month+1<<"月"<<1<<"日"<<endl;
   cout<<endl;
  }

  else
  {
   cout<<"当前日期为"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
   cout<<endl;
   cout<<"明天日期为："<<year<<"年"<<month<<"月"<<day+1<<"日"<<endl;
   cout<<endl;
  }
  break;

}
}

int Date::isLeapyear(int y)
{
if(((y%4==0)&&(y%100!=100))||(y%400==0)) return 1;
else return 0;
}
Date::Date(int y,int m,int d)
{
if((y>=1900)&&(y<=2050))
{
  year=y;
  if((m>=1)&&(m<=12))
  {
   month=m;
   switch(month)
   {
   case 1:
   case 3:
   case 5:
   case 7:
   case 8:
   case 10:
   case 12:
    if((d>=1)&&(d<=31))
    {
     day=d;
    }
    else
    {
     cout<<"day不合理"<<endl;
    }
    break;
   case 4:
   case 6:
   case 9:
   case 11:
    if((d>=1)&&(d<=30))
    {
     day=d;
    }
    else
    {
     cout<<"day不合理"<<endl;
    }
    break;
   case 2:
    if(isLeapyear(year))
    {
     if((d>=1)&&(d<=29))
     {
      day=d;
     }
     else
     {
      cout<<"day不合理"<<endl;
     }
    }
    else
    {
     if((d>=1)&&(d<=28))
     {
      day=d;
     }
     else
     {
      cout<<"day不合理"<<endl;
     }
    }

   }
  }
  else
  {
   cout<<"month不合理"<<endl;
  }
}
else
{
  cout<<"year不合理"<<endl;
}
}
void main()
{
Date d1(2010,2,28);
d1.nextday();
}