万年历

万年历

 

// 已知1980年1月1日是星期二！
#include < iostream.h >
#include < process.h >
#include < string .h >

struct  Date
{
  int  year;
  int  month;
  int  date;
  int  day;
  char  week[ 10 ];
} ;

char   * dweek[ 7 ] = { " Sun " , " Mon " , " Tues " , " Weds " , " Thur " , " Fri " , " Sat " } ;
Date showday(Date pd)
{
  int  i = 0 ,j = 0 ,k = 0 ,time,score;
 i = (pd.year - 1980 ) * 365 + (pd.year - 1980 ) / 4 - (pd.year - 1980 ) / 100 + (pd.year - 1980 ) / 400 ;
 i = i % 7 + 1 ;
 k = (pd.date - 1 ) % 7 ; 
  if ((pd.year % 100 != 0 ) && (pd.year % 4 == 0 ) || (pd.year % 400 == 0 ))
     {
      int  dday1[ 12 ] = { 31 , 29 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31 } ;
      if (pd.month == 2 )   
    {
        pd.day = 29 ;
      if (pd.date > pd.day)
         exit( 0 );
       cout << " 该月的天数为: " << pd.day << endl;   
     }
      else
      {
    pd.day = dday1[pd.month - 1 ];
     if (pd.date > dday1[pd.month - 1 ])
     exit( 0 );
    cout << " 该月的天数为: " << pd.day << endl;
   }
     for (time = 0 ;time < pd.month - 1 ;time ++ )
     j += dday1[time];
  j = j % 7 ;   
  score = i + j + k + 2 ;
   if (score < 7 )
    strcpy(pd.week,dweek[score]); 
   else
   {
    while (score >= 7 )
    {
    score -= 7 ;
   }
  strcpy(pd.week,dweek[score]); 
  }     
  cout << " 该天的星期数为: " << pd.week << endl;   
  }  
     else
     {
     int     dday2[ 12 ] = { 31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31 } ;
   if (pd.month == 2 )   
    {
        pd.day = 28 ;
      if (pd.date > pd.day)
         exit( 0 );
       cout << " 该月的天数为: " << pd.day << endl;   
     }
      else
      {
    pd.day = dday2[pd.month - 1 ];
     if (pd.date > dday2[pd.month - 1 ])
     exit( 0 );
    cout << " 该月的天数为: " << pd.day << endl;
   }
     for (time = 0 ;time < pd.month - 1 ;time ++ )
     j += dday2[time];
  j = j % 7 ;   
  score = i + j + k + 2 ;
   if (score < 7 )
    strcpy(pd.week,dweek[score]); 
   else
   {
    while (score >= 7 )
    {
    score -= 7 ;
   }
  strcpy(pd.week,dweek[score]); 
  }     
  cout << " 该天的星期数为: " << pd.week << endl;
  }
return  pd;
}

void  main()
{
    Date obymd;
    obymd.year = 1980 ;
    obymd.month = 1 ;
    obymd.date = 1 ;
    strcpy(obymd.week,dweek[ 2 ]);
    cout << " 请输入年,月,日: " << "   " ;
    cin >> obymd.year >> obymd.month >> obymd.date;
    showday(obymd);
}