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Thread: switch statement related exercice

  1. #1
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    Default switch statement related exercice

    Muvhango runs a small Fruits and Vegetables sphaza shop. He sells oranges, bananas, apples, tomatoes and potatoes. The table 2 below shows the price list for the items sold.

    Code Description Unit price(R)
    A or a Apples 1.50
    B or b Bananas 2.00
    O or o Oranges 2.50
    P or p Potatoes 6.00
    T or t Tomatoes 10.00
    Muvhango gives a 10% discount if the total amount due exceeds R20. Create an application for Muvhango that will allow a customer to select an item to buy, enter the quantity and thereafter be provided with the total amount due. The customer must be given an opportunity to make payment and be given change. Use the switch statement to determine the unit price.

    . here is my code
    package everythingfishyapp;
    import java.util.Scanner;
     
    /**
     *
     * @author SETH
     */
    public class EveryThingFishyApp {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            // declare variables
            char code;
            double dis = 10,totAmtDue,change,price;
            int payment,quantity;
            String choice = "";
            final double PRICE1 = 1.50, PRICE2 = 2.00,PRICE3 = 2.50,PRICE4 = 6.00,PRICE5 = 10.00;
            Scanner sc = new Scanner(System.in);
     
            //get the user input
            System.out.print("Please select an item to buy: " + "\n" +
                             "A/a --> Apples"   + "\n" +
                             "B/b --> Bananas"  + "\n" +
                             "O/o --> Oranges"  + "\n" +
                             "P/p --> Potatoes" + "\n" +
                             "T/t --> Tomatoes" + "\n" +
                             "Your choice: ");
     
     
     
            code = sc.next().charAt(0);
            price = sc.nextDouble();
            quantity = sc.nextInt();
            payment = sc.nextInt();
            totAmtDue = quantity * price;
            change = payment - totAmtDue;
     
     
     
     
             switch(code){
                case'A':
                case'a':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);;
                    break;
                case'B':
                case'b':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'O':
                case'o':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'P':
                case'p':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'T':
                case't':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                default:
                    System.out.println("You entered an invalid code");
            }
            //display outcome 
            System.out.println(choice);
            System.out.println("Please enter a quantity: ");
            System.out.println("Please make a payment: ");
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
        }
    }

    here is the output
    Please select an item to buy: 
    A/a --> Apples
    B/b --> Bananas
    O/o --> Oranges
    P/p --> Potatoes
    T/t --> Tomatoes
    Your choice: a
     
     
     
     
    b
    Exception in thread "main" java.util.InputMismatchException
    	at java.util.Scanner.throwFor(Scanner.java:864)
    	at java.util.Scanner.next(Scanner.java:1485)
    	at java.util.Scanner.nextDouble(Scanner.java:2413)
    	at everythingfishyapp.EveryThingFishyApp.main(EveryThingFishyApp.java:39)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 32 seconds)

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: switch statement related exercice

    Your problem is probably because of how the Scanner class works. There is a problem with calling nextLine after calling other next methods. Read this for an explanation: https://www.geeksforgeeks.org/why-is...ext-functions/
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: switch statement related exercice

    Quote Originally Posted by Seth Lau.20 View Post
    Muvhango runs a small Fruits and Vegetables sphaza shop. He sells oranges, bananas, apples, tomatoes and potatoes. The table 2 below shows the price list for the items sold.

    Code Description Unit price(R)
    A or a Apples 1.50
    B or b Bananas 2.00
    O or o Oranges 2.50
    P or p Potatoes 6.00
    T or t Tomatoes 10.00
    Muvhango gives a 10% discount if the total amount due exceeds R20. Create an application for Muvhango that will allow a customer to select an item to buy, enter the quantity and thereafter be provided with the total amount due. The customer must be given an opportunity to make payment and be given change. Use the switch statement to determine the unit price.

    . here is my code
    package everythingfishyapp;
    import java.util.Scanner;
     
    /**
     *
     * @author SETH
     */
    public class EveryThingFishyApp {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            // declare variables
            char code;
            double dis = 10,totAmtDue,change,price;
            int payment,quantity;
            String choice = "";
            final double PRICE1 = 1.50, PRICE2 = 2.00,PRICE3 = 2.50,PRICE4 = 6.00,PRICE5 = 10.00;
            Scanner sc = new Scanner(System.in);
     
            //get the user input
            System.out.print("Please select an item to buy: " + "\n" +
                             "A/a --> Apples"   + "\n" +
                             "B/b --> Bananas"  + "\n" +
                             "O/o --> Oranges"  + "\n" +
                             "P/p --> Potatoes" + "\n" +
                             "T/t --> Tomatoes" + "\n" +
                             "Your choice: ");
     
     
     
            code = sc.next().charAt(0);
            price = sc.nextDouble();
            quantity = sc.nextInt();
            payment = sc.nextInt();
            totAmtDue = quantity * price;
            change = payment - totAmtDue;
     
     
     
     
             switch(code){
                case'A':
                case'a':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);;
                    break;
                case'B':
                case'b':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'O':
                case'o':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'P':
                case'p':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                case'T':
                case't':
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("The change is: " + change);
                    break;
                default:
                    System.out.println("You entered an invalid code");
            }
            //display outcome 
            System.out.println(choice);
            System.out.println("Please enter a quantity: ");
            System.out.println("Please make a payment: ");
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
        }
    }

    here is the output
    Please select an item to buy: 
    A/a --> Apples
    B/b --> Bananas
    O/o --> Oranges
    P/p --> Potatoes
    T/t --> Tomatoes
    Your choice: a
     
     
     
     
    b
    Exception in thread "main" java.util.InputMismatchException
    	at java.util.Scanner.throwFor(Scanner.java:864)
    	at java.util.Scanner.next(Scanner.java:1485)
    	at java.util.Scanner.nextDouble(Scanner.java:2413)
    	at everythingfishyapp.EveryThingFishyApp.main(EveryThingFishyApp.java:39)
    Java Result: 1
    BUILD SUCCESSFUL (total time: 32 seconds)

    there is a terms exception handling but i have simplified our code very simple way

    now you can check the result

    i have done with Apple only you should use others; the problem was didn't gave the value of "price " .for specifiq way you have put the price1, price 2 in the different case which was fixed.


     
    package com.company;
     
    import java.util.Scanner;
     
    public class Main {
            double num;
        public static void main(String[] args) {
            char code;
            double dis = 10,totAmtDue,change,price;
            int payment,quantity;
            String choice = "";
            final double PRICE1 = 1.50, PRICE2 = 2.00,PRICE3 = 2.50,PRICE4 = 6.00,PRICE5 = 10.00;
            Scanner sc = new Scanner(System.in);
     
            //get the user input
            System.out.print("Please select an item to buy: " + "\n" +
                    "A/a --> Apples"   + "\n" +
                    "B/b --> Bananas"  + "\n" +
                    "O/o --> Oranges"  + "\n" +
                    "P/p --> Potatoes" + "\n" +
                    "T/t --> Tomatoes" + "\n" +
                    "Your choice: ");
            code = sc.next().charAt(0);
            //price = sc.nextDouble();
            System.out.println("how much you want ?1-9kg maximum");
            quantity = sc.nextInt();
     
            switch(code){
                case 'A':
                case 'a':
                    totAmtDue = quantity * PRICE1;
                    System.out.println("the total amount due is: " + totAmtDue);
                    System.out.println("you have paid");
                    payment = sc.nextInt();
                    change = payment - totAmtDue;
                    System.out.println("The change is: " + change);;
                    break;
     
                default:
                    System.out.println("You entered an invalid code");
            }
     
        }
    }



    solving your problem I got stuck with another implementation here. i couldn't able to pass the value of one method to another method. here is the algorithm of the program.

    if anyone can give me a code to create a purchasing menu option i will be glad.



  4. #4
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    Default Re: switch statement related exercice

    Here's another way to store the data for easy lookup. There's a product code such as 'A' for apple, which can then be used to look up the details of apples.
    import java.util.HashMap;
    public class Scratchpad {
      public static void main(String[] args) {
     
        class Product{
          public String name;
          public Double price;
          Product(String name, Double price){
            this.name = name;
            this.price = price;
          }
          public String toString(){
            return name + ": $" + price;
          }
        }
     
        // load data
        HashMap<Character, Product> productCodes = new HashMap<Character, Product>();
        productCodes.put('A', new Product("Apples", 1.50));
        productCodes.put('B', new Product("Bananas", 2.50));
        productCodes.put('O', new Product("Oranges", 3.50));
        productCodes.put('P', new Product("Potatoes", 4.50));
        productCodes.put('T', new Product("Tomatoes", 5.50));
     
        // display prices
        System.out.println("Choose product " + productCodes);
     
      } // main
    } // scratchpad

    Quote Originally Posted by output
    Choose product {P=Potatoes: $4.5, A=Apples: $1.5, B=Bananas: $2.5, T=Tomatoes: $5.5, O=Oranges: $3.5}
    Last edited by AngleWyrm; July 15th, 2022 at 10:11 PM.

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