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Program in C to calculate or find the day on 1st january of any year 

   1:  #include<stdio.h>
   2:  #include<conio.h> 
   3:  void main()
   4:  {
   5:  int leapdays,firstday,yr;
   6:  long int normaldays,totaldays;
   7:  clrscr();
   8:  printf(“Enter year “);
   9:  scanf(“%d”,&yr);
  10:  normaldays=(yr-1)*365L;
  11:  leapdays=(yr-1)/4-(yr-1)/100+(yr-1)/400;
  12:  totaldays=normaldays+leapdays;
  13:  firstday=totaldays%7;
  14:  if(firstday==0) printf(“\nMonday”);
  15:  if(firstday==1) printf(“\Tuesday”);
  16:  if(firstday==2) printf(“\nWednesday”);
  17:  if(firstday==3) printf(“\nThrusday”);
  18:  if(firstday==4) printf(“\nFriday”);
  19:  if(firstday==5) printf(“\nSaturday”);
  20:  if(firstday==6) printf(“\nSunday”);
  21:  printf(“\n\n\n\n\nPress any key to exit….”);
  22:  getch();
  23:  }

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