ISC COMPUTER SCIENCE PRACTICAL 2009 DAY NUMBER

Design a program to accept a day number (between 1 and 366), year (in 4 digits) from the user
to generate and display the corresponding date. Also accept 'N' (1<=N<=100) from the user to
compute and display the future date corresponding to 'N' days after the generated date.
Display error message if the value of the day number, year and N are not within the limit or
not according to the condition specified. Test your program for the following data and some
random data.

Example:

INPUT : DAY NUMBER : 233 YEAR : 2008 DATE AFTER(N) : 17
OUTPUT: 20TH AUGUST 2008 DATE AFTER 17 DAYS : 6TH SEPTEMBER 2008
INPUT : DAY NUMBER : 360 YEAR : 2008 DATE AFTER(N) : 45
OUTPUT: 25TH DECEMBER 2008 DATE AFTER 45 DAYS : 8TH FEBRUARY 2009

ISC Computer Science Practical 2009 Java Code

import java.util.*;
public class DayNumber {
    public static void main(String[] args) {
        int dayNumber,year;
        int dayAfter;
        boolean flag;
        Scanner in = new Scanner(System.in);
        DaysCalculation date = new DaysCalculation();
        do {
            System.out.println("INPUT THE DAY NUMBER:");
            dayNumber = in.nextInt();
            System.out.println("INPUT YEAR:");
            year = in.nextInt();
            System.out.println("INPUT THE VALUE OF N:");
            dayAfter = in.nextInt();
            flag = date.checkDate(dayNumber,year,dayAfter);
            if (flag == false)
                System.out.println("INVALID INPUTS:");
            } while(flag != true);
        date.setDate(dayNumber,year,dayAfter);   
        date.dateSpecifier();   
        in.close();
        }   
    }
class DaysCalculation {
    public void setDate(int dayNumber, int year, int dayAfter) {
        this.dayNumber = dayNumber;
        this.year = year;
        this.dayAfter = dayAfter;
        }
    public boolean checkDate(int dayNumber, int year, int dayAfter) {
        if ( dayNumber < 1 || dayNumber > 365 )
            return false;
            else if ( dayAfter < 1 || dayAfter > 100)
                return false;
                else if (String.valueOf(year).length() != 4)
                    return false;
                    else
                    return true;
        }
    public void dateSpecifier() {
        int m = 0,k=1;
        for(int i = 1; i <= dayNumber; i++) {
            if( checkLeap(year) == true ? k > ldays[m] : k > mdays[m] ) {
                k = 1;
                m++;
                }
            k++;   
            }
        String prefix;   
        prefix = (k-1)%10 == 1 ? "st" : (k-1)%10 == 2 ? "nd" : (k-1)%10 == 3 ? "rd" : "th";
        System.out.println(k-1+prefix+" "+months[m]);   
        for (int i = 1; i <= dayAfter; i++) {
            if( checkLeap(year) == true ? k > ldays[m] : k > mdays[m] ) {
                k = 1;
                m++;
                if(m > 11) {
                    year++;
                    m = 0;
                    }
                }
            k++;   
            }
        prefix = (k-1)%10 == 1 ? "st" : (k-1)%10 == 2 ? "nd" : (k-1)%10 == 3 ? "rd" : "th";
        System.out.println("DATE AFTER "+dayAfter+" DAYS:"+(k-1)+""+prefix+" "+months[m]);       
        }   
    private boolean checkLeap(int year) {
        if(year%400==0)
           leap=true;
        else if (year%100==0)
           leap=false;
        else if (year%4==0)
           leap=true;
        else
           leap=false;
           return leap;
        }    
    private boolean flag;
    private static boolean leap;   
    private int dayNumber,year;
    private int dayAfter;
    String[] months = {"January","Feburary","March","April","May","June","July","August","Sepetember","October","November","December"};
    int[] mdays={31,28,31,30,31,30,31,31,30,31,30,31};
    int[] ldays={31,29,31,30,31,30,31,31,30,31,30,31};   
    }