#include<stdio.h>
    int main(void)
    {
         int i=0,j,w,year,month,day,a,b,c=1,d=0,num=0;
         char n[10];
         int m[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
             printf ("Please input the year whose calendar you want to know:");

              while ( (n[i]=getchar() )!='\n')
              {
                  i++;
                  if(n[i]==EOF)
                  break;
              }
              printf("\nExample:20190110\n");
               year=(n[0]-48)*1000+(n[1]-48)*100+(n[2]-48)*10+(n[3]-48);
               if (year%4==0&&year%100!=0||year%400==0)
               m[2]=29;
              w = (year+(year-1)/4-(year-1)/100+(year-1)/400)%7;

          if(i>0&&i<=4)
            {
                printf("===============The Calendar of Year %d ===============\n",year);
                for(j=1;j<=12;j++)
                {
                  c=1;
                  printf("          %d\n  MON TUE WED THU FRI SAT SUM\n",j);

                      for(a=1;a<=42;a++)
                      {
                          if(a>=w)
                          {
                              printf("%4d",c);
                              c++;
                          }
                          else printf("    ");
                          if(a%7==0)
                          printf("\n");
                          if(c>m[j])
                          break;
                         }
                        d=d+m[j];
                        w= (year+(year-1)/4-(year-1)/100+(year-1)/400)%7+d%7;
                       printf("\n");
                 }
               }

            else if(i>4&&i<=6)
            {
                month=(n[4]-48)*10+(n[5]-48);
                printf("          %d\n  MON TUE WED THU FRI SAT SUM\n",month);
                       if(month!=1)
                      {
                          for(j=1;j<=month;j++)
                          d=d+m[j-1];
                          w=((year+(year-1)/4-(year-1)/100+(year-1)/400)+d)%7;
                      }
                      for(a=1;a<=42;a++)
                      {
                          if(a>=w)
                          {
                              printf("%4d",c);
                              c++;
                          }
                          else printf("    ");
                          if(a%7==0)
                          printf("\n");
                          if(c>m[month])
                          break;
                         }
               }



                 else if(i>6&&i<=8)
                 {
                     month=(n[4]-48)*10+(n[5]-48);
                     day=(n[6]-48)*10+(n[7]-48);
                     if(year>2019)
                     {
                         num=(year-2019)*365+(year-2016)/4;
                         for(j=1;j<=month;j++)
                         d=d+m[j];
                         num=num+d+day+10;
                     }
                     else if(year<2019)
                     {
                         num=(2019-year)*365+(2020-year)/4;
                          for(j=1;j<=month;j++)
                         d=d+m[j];
                         num=num+d+day+10;
                     }
                     else if(year==2019)
                     {
                          for(j=1;j<=month;j++)
                         d=d+m[j-1];
                         num=num+d+day-10;
                     }
                     w=((year+(year-1)/4-(year-1)/100+(year-1)/400)+d)%7;
                     printf("距2019年1月10日有%d天\n",num);
                     printf("%d年%d月%d日是星期%d\n",year,month,day,w);



                     if(month==1)
                     {
                            switch(day)
                               {
                                    case 1: printf("元旦\n");break;
                                    default:printf("今天不是阳历节日!\n");
                               }
                     }
                    else if(month==2)
                     {
                            switch(day)
                             {
                                   case 14: printf("情人节\n");
                                   break;
                                   default:printf("今天不是阳历节日!\n");
                              }
                    }
                   else if(month==3)
                   {
                           switch(day)
                           {
                                   case 8: printf("妇女节\n");
                                   break;
                                   case 12: printf("植树节\n");
                                   break;
                                   default:printf("今天不是阳历节日!\n");
                           }
                    }
                   else if(month==4)
                   {
                            switch(day)
                            {
                                  case 1: printf("愚人节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                            }
                   }
                   else if(month==5)
                  {
                            switch(day)
                            {
                                  case 1: printf("劳动节\n");
                                  break;
                                  case 4: printf("青年节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                            }
                   }
                   else if(month==6)
                   {
                           switch(day)
                           {
                                 case 1: printf("儿童节\n");
                                 break;
                                 default:printf("今天不是阳历节日!\n");
                           }
                   }
                  else if(month==7)
                   {
                           switch(day)
                            {
                                  case 1: printf("建党节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                            }
                   }
                    else if(month==8)
                   {
                            switch(day)
                            {
                                  case 1: printf("建军节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                            }
                   }
                    else if(month==9)
                   {
                            switch(day)
                            {
                                  case 10: printf("教师节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                            }
                    }
                    else if(month==10)
                    {
                             switch(day)
                             {
                                  case 1: printf("国庆节\n");
                                  break;
                                  default:printf("今天不是阳历节日!\n");
                             }
                    }
                 }
                 return 0;
        }