A library issues books on rental basis at a 2% charge on the cost price of the book per day. As per…

A library issues books on rental basis at a 2% charge on the cost price of the book per day. As per the rules of the library, a book can be retained for 7 days without any fine. If the book is returned after 7 days, a fine will also be charged for the excess days as per the chart given below:

Number of excess days	Fine per day (Rs.)
1 to 5	2.00
6 to 10	3.00
Above 10	5.00

A super class Library has been defined. Define a sub class Compute to calculate the fine and the total amount. The details of the members of both the classes are given below: Class name : Library Data members/instance variables: name : to store the name of the book author : to store the author of the book p : to store the price of the book (in decimals) Methods / Member functions: Library( ... ) : parameterized constructor to assign values to the data members void show( ) : displays the book details Class name : Compute Data members/instance variables: d : number of days taken in returning the book f : to store the fine (in decimals) Methods / Member functions: Compute( ... ) : parameterized constructor to assign values to the data members of both the classes void fine( ) : calculates the fine for the excess days as given in the table above void show( ) : displays the book details along with the number of days, fine and the total amount to be paid. Total amount is (2% of price of book * total no of days) + fine Assume that the super class Library has been defined. Using the concepts of Inheritance, specify the class Compute giving the details of constructor, void fine ( ) and void show ( ) functions. The super class, main function and algorithm need NOT be written.

class Compute extends Library
{
    int d;      // number of days taken in returning the book
    double f;   // fine

    Compute(String name, String author, double p, int d)
    {
        super(name, author, p);
        this.d = d;
        f = 0.0;
    }

    void fine()
    {
        int excess = d - 7;
        if (excess <= 0)
            f = 0.0;
        else if (excess <= 5)
            f = excess * 2.0;
        else if (excess <= 10)
            f = excess * 3.0;
        else
            f = excess * 5.0;
    }

    void show()
    {
        super.show();
        System.out.println("Number of days : " + d);
        System.out.println("Fine           : " + f);
        System.out.println("Total amount   : " + ((0.02 * p * d) + f));
    }
}