Java Programming Problem

[Former Member]

Hi. I am in a beginner Java Programming class and I am having trouble setting up the following problem:

A mail-order house sells five products whose retail prices are as follows: Product 1, $2.98 product 2, $4.50; product 3, $9.98; product 4, $4.49; product 5, $6.87. Write an application that reads a series of pairs of numbers as follows:

a) product number

b) quantity sold

Your program should use a <i>switch</i> statement to determine the retail price for each product. It should calculate and display the total retail value of all products sold. Use a sentinel-controlled loop to determine when the program should stop looping and display the final results.

Any kind of help would be great!

Thanks,

James

[Sigiswald · Accepted solution]

Hi James,

[code]

import java.util.Scanner;

public class Calculator {

private static final String LS = System.getProperty("line.separator", "\r\n");

private static final String SENTINEL = "x";

public static void main(String[] args) {

usage();

Scanner in = new Scanner(System.in);

double sum = 0;

for (; in.hasNextInt();) {

int productNumber = in.nextInt();

double productPrice = getRetailPrice(productNumber);

if (productPrice == -1) {

System.out.println(LS + "Sorry, '" + productNumber

+ "' is not a valid product code. Bye!");

return;

} else if (in.hasNextInt()) {

sum += in.nextInt() * productPrice;

} else {

String invalidQuantity = in.next();

System.out.println(LS + "Sorry, '" + invalidQuantity

+ "' is not a valid quantity. Bye!");

return;

}

}

String sentinel = in.next();

if (SENTINEL.equals(sentinel)) {

System.out.println(LS + "Congratulations! The total retail value of all"

+ " products sold is $"

+ sum + ".");

} else {

System.out.println(LS + "Sorry, '" + sentinel

+ "' doesn't equal '" + SENTINEL + "'. Bye!");

}

}

private static double getRetailPrice(int productNumber) {

switch (productNumber) {

case 1:

return 2.98;

case 2:

return 4.50;

case 3:

return 9.98;

case 4:

return 4.49;

case 5:

return 6.87;

default:

return -1;

}

}

private static void usage() {

System.out.println("Please enter a series of pairs of numbers as follows:");

System.out.println(" product number: 1 to 5");

System.out.println(" quantity sold");

System.out.println("Enter '" + SENTINEL

+ "' to calculate the total retail value of all products sold." + LS);

}

}

[/code]

Enjoy your java programming class!

Kind regards,

Sigiswald

[Former Member · Accepted solution]

Hi everyone,

to the owner of this thread, please <b>respect</b> the fact that this is a forum for professional SAP developers and <b>not</b> a school forum. Please refrain from posting questions that are irrelevant. It clutters up the forum and stops people with real development problems from getting responses from other fellow developers. There are plenty of other forums out there suitable for these types of questions.

To the developers who replied, please do not take this the wrong way but if you answer these questions you encourage such posts and further undemine the value of this forum. I realise you're only trying to help and that is admirable, but there already is a huge problem in some of the forums with posts that add no value whatsoever and make it difficult for developers to find solutions to their problem, as well as discourage people from answering.

Thanks.

Regards,

Dion

[Former Member · Accepted solution]

Well said

[Sigiswald · Accepted solution]

I agree for 100%, but it still was fun once to play with java.util.Scanner instead of the more serious stuff.

[Former Member]

Sorry for posting a java question on a java forum. Thanks to everyone who tried to help and reply. I don't see how my post hurt any other post's chance to get a reply, because my post didn't get a reply that actually helped until several weeks after I posted it. It turns out that I figured out the program on my own, shortly after I posted the original post. Sorry for not replying but I have been busy with school and 60 hours of work every week. With my experiences so far, I have found that Java is a easy language to learn.

[Former Member]

SDN was created as a network for SAP developers aiming to provide resources and knowledge. The purpose of these forums is to help fellow SAP developers to exchange ideas and solutions to different problems that we encounter in our daily work.

Cheers,

Dion

[prashil]

Hi James,

I'll continue you further with the switch statement:

I am editing your code:

import java.util.Scanner;

public class Main

{

public static void main(String[] args)

{

Scanner input = new Scanner(System.in );

double prod1 = 2.98;

double prod2 = 4.50;

double prod3 = 9.98;

double prod4 = 4.49;

double prod5 = 6.87;

int prodnum;

int quansold;

<i>double retprice = 0;</i>

System.out.print( "Enter a product number. ");

prodnum = input.nextInt();

System.out.print( "Enter the quantity sold. ");

quansold = input.nextInt();

<i>switch(prodnum)

{

case 1:

retprice += prod1*quansold;

break;

case 2:

retprice += prod2*quansold;

break;

case 3:

retprice += prod3*quansold;

break;

case 4:

retprice += prod4*quansold;

break;

case 5:

retprice += prod5*quansold;

break;

}

System.out.println("The total retail value is: "+retprice);</i>

}

Hope i have answered your query.

Regards,

Prashil

[Former Member]

Heres what I have so far:

import java.util.Scanner;

public class Main

{

public static void main(String[] args)

{

Scanner input = new Scanner(System.in );

double prod1 = 2.98;

double prod2 = 4.50;

double prod3 = 9.98;

double prod4 = 4.49;

double prod5 = 6.87;

int prodnum;

int quansold;

System.out.print( "Enter a product number. ");

prodnum = input.nextInt();

System.out.print( "Enter the quantity sold. ");

quansold = input.nextInt();

}

}

I'm having difficulty implementing the switch statement, the textbook I'm using isn't very clear on it. By the way, I'm using Java version jdk 1.5.0_11

[Former Member]

James,

please go through the following link to know the systex of Switch Statement.

http://www.macs.hw.ac.uk/~pjbk/pathways/cpp1/node105.html

just make the necessary changes and implement the same.

regards

Anil