SHOW THE DAY OF BIRTH FROM DATE OF BIRTH

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

main()
{
 clrscr();
 int d,m,y,year,month,day,i,n;
 printf("Enter how many times you want to run this program : ");
 scanf("%d",&n);
 for(i=1;i<=n;i++)
 {
 printf("Enter the date : ");
 scanf("%d%d%d",&d,&m,&y);
 if( d>31 || m>12 || (y>1900 || y<=2000) )
  {
   printf("INVALID INPUT");
   getch();
   exit(0);
  }
  year = y-1900;
  year = year/4;
  year = year+y-1900;
  switch(m)
  {
   case 1:
   case 10:
  month = 1;
  break;
   case 2:
   case 3:
   case 11:
  month = 4;
break;
   case 7:
   case 4:
month = 0;
break;
   case 5:
month = 2;
break;
   case 6:
month = 5;
break;
   case 8:
 month = 3;
 break;
   case 9:
   case 12:
  month = 6;
  break;
  }
  year = year+month;
  year = year+d;
  day  = year%7;
 switch(day)
  {
   case 0:
printf("Day is SATURDAY");
break;
   case 1:
printf("Day is SUNDAY");
break;
   case 2:
 printf("Day is MONDAY");
break;
   case 3:
  printf("Day is TUESDAY");
break;
   case 4:
printf("Day is WEDNESDAY");
break;
   case 5:
printf("Day is THURSDAY");
break;
   case 6:
 printf("Day is FRIDAY");
 break;
  }
}
 getch();
 return 0;
}

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