Find the Day in the Given Date in C Language

A simple program that will ask the date and then the program will determine what is the day on the given date and display the results on the screen.

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Sample Program Output

Program Listing

day.c

#include<stdio.h>

#include<math.h>

#include<conio.h>

int fm(int date, int month, int year) {

int fmonth, leap;

if ((year % 100 == 0) && (year % 400 != 0))

leap = 0;

   else if (year % 4 == 0)

  leap = 1;

else

  leap = 0;

  fmonth = 3 + (2 - leap) * ((month + 2) / (2 * month))+ (5 * month + month / 9) / 2;

 fmonth = fmonth % 7;

  return fmonth;

}

int day_of_week(int date, int month, int year) {

   int dayOfWeek;

   int YY = year % 100;

   int century = year / 100;

   printf("\nDate: %d/%d/%d \n", date, month, year);

   dayOfWeek = 1.25 * YY + fm(date, month, year) + date - 2 * (century % 4);

   dayOfWeek = dayOfWeek % 7;

   switch (dayOfWeek) {

      case 0:

         printf("weekday = Saturday");

         break;

      case 1:

         printf("weekday = Sunday");

         break;

      case 2:

         printf("weekday = Monday");

         break;

      case 3:

         printf("weekday = Tuesday");

         break;

      case 4:

         printf("weekday = Wednesday");

         break;

      case 5:

         printf("weekday = Thursday");

         break;

      case 6:

         printf("weekday = Friday");

         break;

      default:

         printf("Incorrect data");

   }

   return 0;

}

int main() {

   int date, month, year;

   printf("\nEnter the year : ");

   scanf("%d", &year);

   printf("\nEnter the month : ");

   scanf("%d", &month);

   printf("\nEnter the date  : ");

   scanf("%d", &date);

   day_of_week(date, month, year);

   return 0;

}