Program 96, Weekday Calculator

Code

   ///Name: Stella Koliavas
   ///Period: 5
   ///File Name: WeekdayCalc.java
   ///Date Finshed: 3/23/16
   

import java.util.Scanner;

public class WeekdayCalc
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);

		System.out.println("Welcome to Mr. Davis's fantastic birth-o-meter!");
		System.out.println();
		System.out.println("All you have to do is enter your birth date, and it will");
		System.out.println("tell you the day of the week on which you were born.");
		System.out.println();
		System.out.println("Some automatic tests....");
		System.out.println("12 10 2003 => " + weekday(12,10,2003));
		System.out.println(" 2 13 1976 => " + weekday(2,13,1976));
		System.out.println(" 2 13 1977 => " + weekday(2,13,1977));
		System.out.println(" 7  2 1974 => " + weekday(7,2,1974));
		System.out.println(" 1 15 2003 => " + weekday(1,15,2003));
		System.out.println("10 13 2000 => " + weekday(10,13,2000));
		System.out.println();

		System.out.println("Now it's your turn!  What's your birthday?");
		System.out.print("Birth date (mm dd yyyy): ");
		int mm = keyboard.nextInt();
		int dd = keyboard.nextInt();
		int yyyy = keyboard.nextInt();
        ;
        System.out.println("You were born on " + weekday_name(dd) + weekday(mm, dd, yyyy));
    }             

	public static String weekday( int month, int dd, int yyyy )
	{
		int yy, total, weekday;
		String date = "";
        
        yy = yyyy-1900;
        total = (yy/4) + yy + dd + monthOffset( month );
        
        if (month ==1 && isLeap(yyyy) == true)
        total = total-1;
        else if (month ==2 && isLeap(yyyy) == true ) 
        total = total -1;
        
        weekday = (total % 7);
 		// bunch of calculations go here

		date = month_name(month) + ", "+dd+ ", " + yyyy;

		return date;
	}


	// paste your methods from MonthName, WeekdayName, and MonthOffset here
   public static String month_name( int month )
	   {
		String result;
        if (month == 1)
        result = "January";
        else if (month ==2)
        result = "February";
        else if (month ==3)
        result = "March";
        else if (month == 4)
        result = "April";
        else if (month ==5)
        result = "May";
        else if (month == 6)
        result = "June";
        else if (month ==7)
        result = "July";
        else if (month == 8)
        result = "August";
        else if (month == 9)
        result = "September";
        else if (month == 10)
        result = "October";
        else if (month == 11)
        result = "November";
        else if (month == 12)
        result = "December";
        else
        result = "error";
		
		return result;
		}
    public static String weekday_name( int weekday )
        {
        String result = "";
        
        if ( weekday == 1 )
        {
          result = "Friday ";
        }
        else if ( weekday == 2 )
        {
          result = "Saturday ";
        }
        else if (weekday == 3)
        {
            result = "Sunday ";
        }
        else if (weekday == 4)
        {
            result = "Monday ";
        }
        else if (weekday == 5)
        {
            result = "Tuesday ";
        }
        else if (weekday == 6)
        {
            result = "Wednesday ";
        }
        else if (weekday == 7)
        {
            result = "Thursday ";
        }
        else
            result = "Thursday ";
        return result;
        }
    public static int monthOffset( int month )
        {
		int result;
        if (month == 1)
        result = 1;
        else if (month ==2)
        result = 4;
        else if (month ==3)
        result = 4;
        else if (month == 4)
        result = 0;
        else if (month ==5)
        result = 2;
        else if (month == 6)
        result = 5;
        else if (month ==7)
        result = 0;
        else if (month == 8)
        result = 3;
        else if (month == 9)
        result = 6;
        else if (month == 10)
        result = 1;
        else if (month == 11)
        result = 4;
        else if (month == 12)
        result = 6;
        else
        result = -1;
		
		return result;
		}
		
	public static boolean isLeap( int year )
	{
		// years which are evenly divisible by 4 are leap years,
		// but years divisible by 100 are not leap years,
		// though years divisible by 400 are leap years
		boolean result;

		if ( year%400 == 0 )
			result = true;
		else if ( year%100 == 0 )
			result = false;
		else if ( year%4 == 0 )
			result = true;
		else
			result = false;
		
		return result;
	}
                           
}


        
    

Picture of the output