new

Author: Sbiswas001

out/production/ComputerProject/com/sbiswas001/twelveproject/DateRepresentation.class

@@ -1,4 +1,177 @@
 package com.sbiswas001.twelveproject;
 
+import java.util.Scanner;
+
+/**
+ * This class enters a number of days and a year(4 digit)
+ * from user and prints the date. It also takes an
+ * increment(1 to 100) value and shows the new date.
+ * @author Sayan Biswas
+ * @version 25.04.2022
+ */
 public class DateRepresentation {
+
+    /**
+     * Stores number of initial days entered by user
+     */
+    private int days;
+
+    /**
+     * Stores year entered by user
+     */
+    private int year;
+
+    /**
+     * Stores number of days to increment to old date
+     */
+    private int increment;
+
+    /**
+     * Stores the month index
+     */
+    private int monthIndex;
+
+    /**
+     * Stores the suffix of date
+     */
+    private String suffix;
+
+    /**
+     * Stores the old date
+     */
+    private int oldDate;
+
+    /**
+     * Stores new date
+     */
+    private int daysAfter;
+
+    /**
+     * Stores names of months
+     */
+    private final String[] monthNames;
+
+    /**
+     * Stores number of days of each month
+     */
+    private final int[] monthDays;
+
+    /**
+     * Initialises instance variables
+     */
+    private DateRepresentation() {
+        days = 0;
+        year = 0;
+        increment = 0;
+        monthIndex = 0;
+        suffix = "";
+        oldDate = 0;
+        daysAfter = 0;
+        monthNames = new String[]{"JANUARY", "FEBRUARY", "MARCH",
+                "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "SEPTEMBER",
+                "OCTOBER", "NOVEMBER", "DECEMBER"};
+        monthDays = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+    }
+
+    /**
+     * Inputs the days, year and increment value
+     */
+    private void input() {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter number of days: ");
+        days = Integer.parseInt(sc.next());
+        System.out.print("Enter year(4 digits): ");
+        year = Integer.parseInt(sc.next());
+        if (year < 1000 || year > 9999) {
+            System.out.println("Try again! Year must be of 4 digits.");
+            input();
+        }
+        System.out.print("Enter increment after old date: ");
+        increment = Integer.parseInt(sc.next());
+        if (increment < 1 || increment > 100) {
+            System.out.println("Try again! Range is 1 to 100.");
+            input();
+        }
+    }
+
+    /**
+     * Calculates old date
+     */
+    private void oldDateCalculator() {
+        //February should have 29 days if it is leap year
+        if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0))
+            monthDays[1] = 29;
+
+        oldDate = days;
+        int i = 0;
+        while(oldDate > monthDays[i]) {
+            oldDate -= monthDays[i];
+            monthIndex = i + 1;
+            i++;
+            if (i == 12) {
+                i = 0;
+                year++;
+                if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)) {
+                    monthDays[1] = 29;
+                }
+            }
+        }
+
+        //Adding suffix as per day
+        if (oldDate % 10 == 1 && oldDate / 10 != 1) {
+            suffix = "ST";
+        } else if (oldDate % 10 == 2 && oldDate / 10 != 1) {
+            suffix = "ND";
+        } else if (oldDate % 10 == 3 && oldDate / 10 != 1) {
+            suffix = "RD";
+        } else {
+            suffix = "TH";
+        }
+    }
+
+    /**
+     * Calculates new date
+     */
+    private void newDateCalculator() {
+        //Calculating date after n days
+        daysAfter = oldDate + increment;
+        int i = 0;
+        while(daysAfter > monthDays[i]) {
+            daysAfter -= monthDays[i];
+            monthIndex = i + 1;
+            i++;
+            if (i == 12) {
+                i = 0;
+                year++;
+                if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)) {
+                    monthDays[1] = 29;
+                }
+            }
+        }
+        //Adding suffix as per day
+        if (daysAfter % 10 == 1 && daysAfter / 10 != 1) {
+            suffix = "ST";
+        } else if (daysAfter % 10 == 2 && daysAfter / 10 != 1) {
+            suffix = "ND";
+        } else if (daysAfter % 10 == 3 && daysAfter / 10 != 1) {
+            suffix = "RD";
+        } else {
+            suffix = "TH";
+        }
+    }
+
+    /**
+     * Calls other methods
+     * @param args Arguments passed to main method
+     */
+    public static void main(String[] args) {
+        DateRepresentation ob = new DateRepresentation();
+        ob.input();
+        ob.oldDateCalculator();
+        System.out.println("Old date: " + ob.oldDate + ob.suffix + " " +
+                ob.monthNames[ob.monthIndex] + " " + ob.year);
+        ob.newDateCalculator();
+        System.out.println("New date: " + ob.daysAfter + ob.suffix + " " +
+                ob.monthNames[ob.monthIndex] + " " + ob.year);
+    }
 }