Assignemnt #96 Weekday Calculator

Code

import java.util.Scanner;

public class WeekdayCalculator
{
	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();

		// put a method call for weekday() here
		System.out.println("You were born on "+ weekday(mm,dd,yyyy));
	}


	public static String weekday( int mm, int dd, int yyyy )
	{
		int y, total;
		String date = "";
        y= yyyy-1900;
        total= (y/4) + y +dd;
        total = monthOffset(mm) + total;
        boolean leap = isLeap(yyyy);
        if (leap == true)
        {
            if (mm == 1 || mm == 2)
                total = total -1;
        }
        int weekday = total%7;
        weekday_name(weekday);

		// bunch of calculations go here

		date = weekday_name(weekday) + ", "+monthName(mm) + ", "+ dd+", " + yyyy;

		return date;
	}


	// paste your methods from MonthName, WeekdayName, and MonthOffset here
	public static String monthName( int month )
	{
		String result="";
		

  		if (month==1)
  			result="January";
        if (month==2)
        	result="Febuary";
        if (month==3)
        	result="March";
  		if (month==4)
  			result="April";
        if (month==5)
        	result="May";
        if (month==6)
        	result="June";
        if (month==7)
        	result="July";
        if (month==8)
        	result="August";
        if (month==9)
        	result="September";
        if (month==10)
        	result="October";
        if (month==11)
        	result="November";
        if (month==12)
        	result="December";
          
        else if (month< 1 || month>12)
        	result="error";
		return result;
	}
    public static int monthOffset( int month )
	{
		int result=0;

  		if (month==1)
  			result=1;
  		if (month==2)
  			result=4;
  		if (month==3)
  			result=4;
  		if (month==4)
  			result=0;
  		if (month==5)
  			result=2;
  		if (month==6)
  			result=5;
  		if (month==7)
  			result=0;
  		if (month==8)
  			result=3;
  		if (month==9)
  			result=6;
  		if (month==10)
  			result=1;
  		if (month==11)
  			result=4;
  		if (month==12)
  			result=6;
  		else if (month< 1 || month>12)
  			result=-1;
		return result;
	}
    public static String weekday_name( int weekday )
	{
		String result = "";

		if ( weekday == 1 )
		{
			result = "Sunday";
		}
		else if ( weekday == 2 )
		{
			result = "Monday";
		}
		else if ( weekday == 3 )
		{
			result = "Tuesday";
		}
		
		else if ( weekday == 4 )
		{
			result = "Wednesday";
		}
		else if ( weekday == 5 )
		{
			result = "Thursday";
		}
		
		else if ( weekday == 6 )
		{
			result = "Friday";
		}
		
		else if ( weekday == 7 )
		{
			result = "Saturday";
		}
		
		else if ( weekday == 0 )
		{
			result = "Saturday";
		}
		
		else 
		{
			result = "error";
		}
		
		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