# Assignemnt #96 and Weekday Calculator

## Code

```
///name: nick cerdan
///period: 6
///program name: Weekday calender
///file name: WeekdayCalculator.java
///date finished: 11/9/15

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.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(mm, dd, yyyy));
}

public static String weekday( int mm, int dd, int yyyy )
{
int yy, total;
String date = "";

yy = yyyy - 1900;
total = yy / 4;
total = total + yy;
total = total + dd;
total = total + monthOffset(mm);

if (isLeap(yyyy) == true && mm == 1 || mm == 2)
{
total--;
}

int remain = total % 7;

date = WeekdayName(remain) + ", " + month_name(mm) + ", " + dd + ", " + yyyy;

return date;
}

public static int monthOffset( int mm )
{
int result;

if (mm == 1)
result = 1;
else if (mm == 2)
result = 4;
else if (mm == 3)
result = 4;
else if (mm == 4)
result = 0;
else if (mm == 5)
result = 2;
else if (mm == 6)
result = 5;
else if (mm == 7)
result = 0;
else if (mm == 8)
result = 3;
else if (mm == 9)
result = 6;
else if (mm == 10)
result = 1;
else if (mm == 11)
result = 4;
else if (mm == 12)
result = 6;
else
result = -1;

return result;
}

public static String month_name( int mm )
{
String result;

if (mm == 1)
result = "January";
else if (mm == 2)
result = "February";
else if (mm == 3)
result = "March";
else if (mm == 4)
result = "April";
else if (mm == 5)
result = "May";
else if (mm == 6)
result = "June";
else if (mm == 7)
result = "July";
else if (mm == 8)
result = "August";
else if (mm == 9)
result = "September";
else if (mm == 10)
result = "October";
else if (mm == 11)
result = "November";
else if (mm == 12)
result = "December";
else
result = "ERROR";

return result;
}

public static String WeekdayName( int remain )
{
String result;

if (remain == 0)
result = "Sunday";
else if (remain == 1)
result = "Monday";
else if (remain == 2)
result = "Tuesday";
else if (remain == 3)
result = "Wednesday";
else if (remain == 4)
result = "Thursday";
else if (remain == 5)
result = "Friday";
else if (remain == 6)
result = "Satruday";
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;
}
} ```