HW3.21

 1 import java.util.Scanner;
 2 
 3 public class Solution
 4 {
 5     public static void main(String[] args)
 6     {
 7         Scanner input = new Scanner(System.in);
 8 
 9         System.out.print("Enter year: (e.g., 2008): ");
10         int year = input.nextInt();
11         System.out.print("Enter month: 1-12: ");
12         int month = input.nextInt();
13         System.out.print("Enter the day of the month: 1-31: ");
14         int day = input.nextInt();
15 
16         if(month == 1 || month == 2)
17         {
18             month += 12;
19             year--;
20         }
21 
22         int k = year % 100;
23         int j = (int)(year / 100);
24         int weekday = (day + (int)(26 * (month + 1) / 10) + k + (int)(k / 4) + (int)(j / 4) + 5 * j) % 7;
25 
26         String weekdayString = "";
27         switch(weekday)
28         {
29             case 0: weekdayString = "Saturday"; break;
30             case 1: weekdayString = "Sunday"; break;
31             case 2: weekdayString = "Monday"; break;
32             case 3: weekdayString = "Tuesday"; break;
33             case 4: weekdayString = "Wednesday"; break;
34             case 5: weekdayString = "Thursday"; break;
35             case 6: weekdayString = "Friday"; break;
36         }
37 
38         System.out.println("Day of the week is " + weekdayString);
39     }
40 }