Question

This code must be written in Java. This code also needs to include a package and a public static void main(String[] args)

Write a program named DayOfWeek that computes the day of the week for any date entered by the user. The user will be prompted to enter a month, day, and year. The program will then display the day of the week (Sunday..Saturday). The following example shows what the user will see on the screen:

This program calculates the day of the week for any dates.

Enter month (1-12): 9

Enter day (1-31): 25

Enter year: 1998

The day of the week is Friday.

Hint: Use Zeller's congruence to compute the day of the week. Zeller's congruence relies on the following quantities:

J is the century (19, in our example)

K is the year within the century (98, in our example)

m is the month (9, in our example)

q is the day of the month (25, in our example)

The day of the week is determined by the following formula:

h = (q + 26(m + 1) / 10 + K + K / 4 + J / 4 + 5J) mod 7

where the results of the divisions are truncated. The value of h will lie between 0 (Saturday) and 6 (Friday).

Note: Zeller's congruence assumes that January and February are treated as months 13 and 14 of the previous year; this affects the values of K and m, and possibly the value of J. Note that the value of h does not match the desired output of the program, so some adjustment will be necessary. Apply Exception Handling.

Answer 1

Java code :

import java.util.*;
class Day_of_week {
   static void finding_the_week(int day_value, int month_value, int year_value){
       if (month_value == 1) {
           month_value = 13;
           year_value--;
       }
       if (month_value == 2){
           month_value = 14;
           year_value--;
       }
       int q = day_value;
       int m = month_value;
       int K = year_value % 100;
       int J = year_value / 100;
       int h = (q + 26*(m + 1) / 10 + K + K / 4 + J / 4 + 5*J) % 7;
       switch (h)
       {
           case 0 : System.out.println("Day of the week is Saturday"); break;
           case 1 : System.out.println("Day of the week is Sunday"); break;
           case 2 : System.out.println("Day of the week is Monday"); break;
           case 3 : System.out.println("Day of the week is Tuesdau"); break;
           case 4 : System.out.println("Day of the week is Wednesday"); break;
           case 5 : System.out.println("Day of the week is Thursday"); break;
           case 6 : System.out.println("Day of the week is Friday"); break;
       }
   }
  
   public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
       int day,month,year;
       System.out.print("Enter day :");
       day = sc.nextInt();
       System.out.print("Enter month :");
       month = sc.nextInt();
       System.out.print("Enter Year :");
       year = sc.nextInt();
       finding_the_week(day,month,year);
   }
}

Output :

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