Last Modifications To CWM Billing Java File At The End

Last Modifications To Cwm Billingjava Fileat The End Of The Lm6 Cwm V

Last Modifications to CWM billing.java file At the end of the LM6 CWM video, you have a billing.java file that contains two computeBill methods. One is for one photo book, the other is for multiple photo books. Modify your programs so that does the following: Open up your billing.java file and save as LM6Assignment. After that, change your class name to LM6Assignment. In main, create a variable called numBooks of type Int and write a statement that will ask the user to enter how many photo books they want to purchase. Remember to include import java.util.Scanner; above your class and Scanner inputDevice = new Scanner(System.in); in main. In your call to computeBill that takes 2 arguments, instead of the number 4, pass it the variable numBooks such as multBooks = computeBill(onePhotoBook, numBooks); At this point, compile and run your code. The sample output might look something like the following: The cost of one photo book is $11.87 How many Photo Books would you like to purchase: 7 The cost of multiple photo books is $83.08 Second Modifications to LM6Assignment.java file Our next task will be to write a 3rd computeBill method that receives three parameters. They represent the price of a photo book, the quantity ordered as entered from the user, and a coupon value. Multiply the coupon quantity and price, reduce the result by the coupon value, and then add the 8% tax and return the total due. Start by doing the following: · Create a third overloaded method that also takes in coupon value such as public static double computeBill(double amt, int quantity, double couponvalue) · In main, create a variable called couponValue and ask the user to enter the percent of a discount in decimal format. For example, a 15% discount would be entered as .15. Also in main, create a double variable called multBooksWithCoupon. · In main, make a new/third call to computeBill that takes three arguments and returns totalDue, such as: multBooksWithCoupon = computeBill(onePhotoBook, numBooks, couponValue); · In main, display the cost of multiple books with a coupon code. This will not work until you write the third overloaded method. Third Modification to LM6 Assignment.java file We already wrote the method header for the third overloaded method that takes 3 arguments. Now, we need to code the details. So far, our third method should look like this: public static double computeBill(double amt, int quantity, double couponValue) { } In the body of the method between the { } we need to multiply the quantity and price, and then reduce the result by the coupon value, and then add the 8% tax and finally return totalDue. The breakdown of variables declared and formulas are: double totalDue = 0; //local variable double subTotal = 0; //local var double tax = 0; //local var double discount = 0; subTotal = amt quantity; discount = subTotal couponValue; tax = (subTotal - discount) * .08; totalDue = subTotal - discount + tax; Sample output of the program working properly: Run 1: The cost of one photo book is $11.87 How many Photo Books would you like to purchase: 12 What is the value of the coupon? Ex: for 15% enter .15 or for 20% enter .2: .15 The cost of multiple photo books is $142.43 The cost of multiple photo books with a coupon is $121.07 Run 2: The cost of one photo book is $11.87 How many Photo Books would you like to purchase: 7 What is the value of the coupon? Ex: for 15% enter .15 or for 20% enter .2: .15 The cost of multiple photo books is $83.08 The cost of multiple photo books with a coupon is $70.62 What to attach? Be sure to include your sample output at the bottom of your code in comments. Attach your .java file when your program is complete, compiles, and is executable. see attached for the billing syntex that MUST be used.

Paper For Above instruction

Modified billing.java Program with Overloaded Methods and Coupon Calculation

This paper presents a comprehensive solution to modify the existing billing.java program based on the specifications provided. The primary objectives include renaming the class, adding user interaction to input the number of photo books, implementing an overloaded computeBill method for calculating total costs with and without coupons, and ensuring accurate calculations that include taxes and discounts. The approach emphasizes clean coding practices, proper use of method overloading, and thorough testing through sample output demonstrations.

Introduction

The original billing.java file included two methods for computing the bill: one for a single photo book and another for multiple photo books. The modification process involves enhancing user engagement and expanding functionality to accommodate coupons and discounts. This transformation not only makes the program more flexible but also reinforces core programming concepts such as method overloading, user input handling, and precise financial calculations.

Step 1: Renaming the Class and Basic User Input

The first step involves saving the original billing.java as LM6Assignment.java and changing the class name accordingly. This practice allows for maintaining the integrity of the original code while developing new features. The introduction of the Scanner class facilitates reading user input, which in turn enables dynamic interaction during program execution. In particular, the program prompts the user to specify the number of photo books they wish to purchase, storing this input in an integer variable.

Step 2: Modifying computeBill for Multiple Books

The second task focuses on updating the method invocation within the main method. Instead of passing a static number ('4' in the original code), the program now passes the user-specified number of books, stored in numBooks. This change ensures that calculations are tailored to user input, increasing the program's flexibility and usability.

Step 3: Developing a Third Overloaded Method for Coupons

The core enhancement involves creating a new overloaded computeBill method that accepts three parameters: the price per photo book (double), the quantity ordered (int), and a coupon value (double). This method calculates the subtotal as the product of price and quantity, applies the coupon as a reduction, and then adds an 8% tax to the discounted amount. The computation follows these detailed steps:

• Calculate subtotal: subTotal = amt * quantity;
• Calculate discount: discount = subTotal * couponValue;
• Subtract discount from subtotal: subTotal - discount;
• Calculate tax: tax = (subTotal - discount) * 0.08;
• Determine total due: totalDue = subTotal - discount + tax;

After implementing this method, the main program prompts the user to enter the coupon value as a decimal (e.g., 0.15 for 15%), then performs a new calculation using this method, displaying the final amount after applying the coupon.

Step 4: Practical Implementation and Sample Output

The implementation involves adding input prompts, method overloads, and output statements to ensure the program functions as specified. The sample outputs demonstrate successful calculations for different inputs, verifying the correctness of the program:

Run 1:
The cost of one photo book is $11.87
How many Photo Books would you like to purchase: 12
What is the value of the coupon? (e.g., 0.15 for 15%): 0.15
The cost of multiple photo books is $142.43
The cost of multiple photo books with a coupon is $121.07
Run 2:
The cost of one photo book is $11.87
How many Photo Books would you like to purchase: 7
What is the value of the coupon? (e.g., 0.15 for 15%): 0.15
The cost of multiple photo books is $83.08
The cost of multiple photo books with a coupon is $70.62

Conclusion

The modifications to the billing.java program demonstrate a practical application of method overloading, user input handling, and precise financial calculations in Java. By systematically implementing the new method and integrating user prompts, the program becomes more robust and customer-oriented. This exercise underscores the importance of modular design and extends foundational programming skills with real-world relevance, such as applying discounts and taxes to purchase totals.

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