Conditional Constructs in Java

Chapter 8

Conditional Constructs in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Menu Driven Program - City Library Late Fine Calculator

43. The City Library charges late fine from members if the books were not returned on time as per the following table:

Number of days late	Magazines fine per day	Text books fine per day
Up to 5 days	Rs. 1	Rs. 2
6 to 10 days	Rs. 2	Rs. 3
11 to 15 days	Rs. 3	Rs. 4
16 to 20 days	Rs. 5	Rs. 6
More than 20 days	Rs. 6	Rs. 7

Using the switch statement, write a program in Java to input name of person, number of days late and type of book — 'M' for Magazine and 'T' for Text book. Compute the total fine and display it along with the name of the person.

Java

import java.util.Scanner;
 
public class LibraryFineCalculator {
    public static void main(String[] args) {
 
        // Title
        System.out.println("CITY LIBRARY LATE FINE CALCULATOR");
        System.out.println("--------------------------------");
 
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter name of the person: ");
        String name = sc.nextLine();
 
        System.out.print("Enter number of days late: ");
        int days = sc.nextInt();
 
        System.out.print("Enter type of book (M for Magazine, T for Text Book): ");
        char type = sc.next().toUpperCase().charAt(0);
 
        int finePerDay = 0;
        int totalFine;
 
        switch (type) {
            case 'M':
                if (days <= 5)
                    finePerDay = 1;
                else if (days <= 10)
                    finePerDay = 2;
                else if (days <= 15)
                    finePerDay = 3;
                else if (days <= 20)
                    finePerDay = 5;
                else
                    finePerDay = 6;
                break;
 
            case 'T':
                if (days <= 5)
                    finePerDay = 2;
                else if (days <= 10)
                    finePerDay = 3;
                else if (days <= 15)
                    finePerDay = 4;
                else if (days <= 20)
                    finePerDay = 6;
                else
                    finePerDay = 7;
                break;
 
            default:
                System.out.println("Invalid book type entered!");
                sc.close();
                return;
        }
 
        totalFine = finePerDay * days;
 
        System.out.println("\nName of Member : " + name);
        System.out.println("Total Fine     : Rs. " + totalFine);
 
        sc.close();
    }
}

Output

Sample Output 

CITY LIBRARY LATE FINE CALCULATOR
--------------------------------
Enter name of the person: Rahul
Enter number of days late: 12
Enter type of book (M for Magazine, T for Text Book): T

Name of Member : Rahul
Total Fine     : Rs. 48

📝 Explanation

User inputs name, days late, and book type
switch is used for book type selection
if–else assigns fine per day based on number of days
Total fine is calculated as:

Total Fine = Days Late × Fine Per Day

Displays the member’s name and fine amount
Invalid book type gives an error message