overdueFine(int[]), newBook()

BookFactory.java
- newBook() now returns the new ‘Book’ created instead of ‘void’
- if getBook() failed, it now returns an empty ‘Book’

Book.java
- overdueFine(int[]) is now rewritten

Book.java

@@ -83,20 +83,36 @@ class Book
   public double overdueFine(int[] currentDay)
   {
     double fine;
+    boolean monChange = false;
 
-    if(currentDay[0] > dueDate[0] || currentDay[1] > (dueDate[1] + 1))
+    while(currentDay[0] > dueDate[0])
     {
-      return 5;
-    }
-    else if(currentDay[1] > dueDate[1])
-    {
-      fine = (double)(currentDay[2] + 30 - dueDate[2]) * 0.25;
+      currentDay[0]--;
+      currentDay[1]+=12;
     }
-    else
+
+    while(currentDay[1] > dueDate[1])
     {
-      fine = (double)(currentDay[2] - dueDate[2]) * 0.25;
+      int mon = currentDay[1] % 12;
+
+      if(mon == 1 || mon == 3 || mon == 5 || mon == 7 || mon == 8 || mon == 10 || mon == 12)
+      {
+        currentDay[2]+=31;
+      }
+      else if(mon == 2)
+      {
+        currentDay[2]+=28;
+      }
+      else
+      {
+        currentDay[2]+=30;
+      }
+
+      currentDay[1]--;
     }
 
+    fine = (double)(currentDay[2] - dueDate[2]) * 0.25;
+
     if(fine > 5)
     {
       return 5;

BookFactory.java

@@ -15,20 +15,24 @@ class BookFactory
     id = 0;
   }
 
-  public void newBook()
+  public Book newBook()
   {
     Book temp = new Book(id);
     books.add(temp);
 
     id++;
+
+    return temp;
   }
 
-  public void newBook(String title)
+  public Book newBook(String title)
   {
     Book temp = new Book(title, id);
     books.add(temp);
 
     id++;
+
+    return temp;
   }
 
   public Book getBook(int index)
@@ -50,7 +54,6 @@ class BookFactory
 
     System.out.println("Error 404 : Book not found");
 
-    Book empty = new Book();
-    return empty;
+    return newBook();
   }
 }