Question

java language using loops and methods

public static double FinalPrice(double price, int model) • The method takes initial models and the priceas parameters and it returns new price base on the following: • The discount rate is 20% of the price if the car year model is 2000 or before • The discount rate is 10% of the price if the car year model is 2010 or before • Otherwise, the discount rate is 5% of the price. The new price is computed by the formula: new price=old price * (1- discount rate) Write a test program and to displays, the new price for each car and finally, it displays the total of prices car before and after discounting as shown in the following sample run. Hint: the program continues asking the user to enter information of a new car until he/she enters 'n' Give the price and the year model of the car: 5000 1999 The new price is 4000.0 Another car? In to stop] : Y Give the price and the year model of the car: 5000 2002 The new price is 4500.0 Another car? [n to stop]:y Give the price and the year model of the car:8000 2009 The new price is 7200.0 Another car? [n to stop]:y Give the price and the year model of the car:8000 2011 The new price is 7600.0 Another car? [n to stopl:y Give the price and the year model of the car: 15000 2013 The new price is 14250.0 Another car? [n to stopl:y Give the price and the year model of the car: 3000 1992 The new price is 2400.0 Another car? [n to stop]: Give the price and the year model of the car: 6000 2006 The new price is 5400.0 Another car? [n to stoplin The total of prices before discounting: S0000.0 The total of prices after discounting: 45350.0

Answer 1

Step 1 : Save the following code in CarPrice.java

package com.HomeworkLib;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class CarPrice {
   // Method to calculate final price after discount
   public static double FinalPrice(double price, int model) {
// Assign rate based on year   

double discountRate = 0.05;
       if(model <= 2000) {
           discountRate = 0.2;
       } else if(model <= 2010) {
           discountRate = 0.1;
       }
       // Calculate new price and return
       return price * (1 - discountRate);
   }
      
   public static void main(String[] args) {  
       // Reader to get input
       BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
       double beforeDiscount = 0;
       double afterDiscount = 0;
       String line = "";
       String[] numbers;
       double price;
       double newPrice;
       int year;
       boolean run = true;
       do {
           System.out.print("Give the price and the year model of the car : ");  
           try {
               line = reader.readLine();
               numbers = line.trim().split(" ");
               price = new Double(numbers[0].trim());
               year = new Integer(numbers[1].trim());
               // Find out price after discount
               newPrice = FinalPrice(price, year);
               System.out.println("The new price is " + newPrice);
               beforeDiscount += price;
               afterDiscount += newPrice;
               System.out.print("Another car? [n to stop] : ");
               line = reader.readLine();
               if("n".equals(line.trim().toLowerCase())) {
                   run = false;
               }
           } catch (Exception ex) {}
       } while (run);
       System.out.println("Total of prices before discounting : " + beforeDiscount);
       System.out.println("Total of prices after discounting : " + afterDiscount);
   }
}

Step 2 : Build the project and run the program using java com.HomeworkLib.CarPrice

Following is my sample output