Assignemnt 96 and WeekdayCalculator
Code
/// Name: Xinting Chen
/// Period: 7
/// Program Name: Weekday Calculator
/// File Name: AreaCalculator.java
/// Date Finished: 3/30/2016
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();
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) + ", " + yyyy;
return date;
}
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 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 String weekdayname( int remain )
{
String result;
if (remain == 1)
result = "Sunday";
else if (remain == 2)
result = "Monday";
else if (remain == 3)
result = "Tuesday";
else if (remain == 4)
result = "Wednesday";
else if (remain == 5)
result = "Thursday";
else if (remain == 6)
result = "Friday";
else if (remain == 7)
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
