Slight miscalculation with code for discounts.

Programming Questions

Senan Ser..

Slight miscalculation with code for discounts.

in Programming Questions • 20 days ago

Greetings yet again!

I come back with yet another problem I managed to solve but not quite, I solemnly promise to help back to the community once I become proficient, till them I ask for more help.

'Tis the code:

import javax.swing.*;

double artic;

int cant;

int tipoClient; // 1 for frecuente, any other for normal..

double descNorm = 0.05;

double descFrec = 0.10;

double subt;

double desct;

double total;

String valor;

valor= JOptionPane.showInputDialog("Enter the article's price.");

artic =Integer.parseInt(valor);

valor= JOptionPane.showInputDialog("Enter amount");

cant=Integer.parseInt(valor);

valor= JOptionPane.showInputDialog("Welcome to the descount system \n Enter 1, if it is a frecuent costumer, or any other digit for a normal one");

tipoClient=Integer.parseInt(valor);

subt= artic * cant;

switch(tipoClient){

case 1: desct= subt*descNorm;

break;

default: desct= subt*descFrec;

break;

}

total= subt-desct;

JOptionPane.showMessageDialog(null,total);

System.exit(0);

Originally the problem said and I quote: "Find the total of an article in discount, if the costumer is a regular apply 10%

if not apply 5%" Problem is that the code is giving me things that it shouldn't as a result, I tried this in raptor first and it worked just well.

Scenario:

Price: 500

Regular: Yes/1

Sie sind das Essen und wir sind die Jäger!

Replies(5)

GoToLoop

Re: Slight miscalculation with code for discounts.

20 days ago

We have to round the result to have less fractional digits.
Also, I've made lotsa tweaks on your program. Check it out:

/** 
 * JOptionPane Input (v2.03)
 * by Senan Serat (2013/Sep)
 * mod GoToLoop
 * 
 * http://forum.processing.org/topic/slight-miscalculation-with-code-for-discounts
 */

import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JOptionPane;

import java.awt.GridLayout;

final JPanel panel = new JPanel(new GridLayout(2, 1, 0, 010));
final JLabel label = new JLabel();
final JTextField answer = new JTextField(10);

panel.add(label);
panel.add(answer);

final String[] options = {
  "Confirm"
};

final float FREQ = .1, NORM = .05;

label.setText("Enter the article's unit price.");

JOptionPane.showOptionDialog(null, panel, "Article", 
JOptionPane.NO_OPTION, JOptionPane.QUESTION_MESSAGE, 
null, options, options[0]);

final float article = round(abs(float(answer.getText()))*100)/100;

label.setText("Enter its amount");
answer.setText("");

JOptionPane.showOptionDialog(null, panel, "Amount", 
JOptionPane.NO_OPTION, JOptionPane.QUESTION_MESSAGE, 
null, options, options[0]);

final int amount = abs(int(answer.getText()));

final int type = JOptionPane.showConfirmDialog(
null, "Welcome to the discount system.\n" +
"Hit 'Yes' if it is a frequent customer,\nor 'No' otherwise.", 
"Client Type", JOptionPane.YES_NO_OPTION);

final float subTotal = article*amount;
final float discount = type == JOptionPane.YES_OPTION?
subTotal*FREQ : subTotal*NORM;
final float total = subTotal - discount;

JOptionPane.showMessageDialog(null, "Price: $" + nf(subTotal, 0, 2)
+ "\nDiscount: $" + nf(total, 0, 2) + "\nQuantity: " + amount, 
"Result", JOptionPane.INFORMATION_MESSAGE);

exit();

Senan Ser..

Re: Slight miscalculation with code for discounts.

20 days ago

You have no idea how much I appreciate your efforts!

But its not you it is actually me, while this will be of greaaat help for me in the next semester most likely I don't know how to do it, so the professor is most likely not going to take it from me D:

If you could teach me how to round and avoid the horrible error in mine or explain me a bit about yours it would be great.

GoToLoop

Re: Slight miscalculation with code for discounts.

20 days ago

Round up happens in this line:
For the rest, you gotta be more specific whatcha don't get.

final float article = round(abs(float(answer.getText()))*100)/100;

PhiLho

Re: Slight miscalculation with code for discounts.

20 days ago

See http://floating-point-gui.de/

Senan Ser..

Re: Slight miscalculation with code for discounts.

19 days ago

By the way Mr.Loop your coding and tweaks to the program are freaking gorgeous, I didn't examine it as much that day until tonight and I gotta say I am very impressed. I hope to be able to understand it in time, so far I have only been introduced to programming 2 weeks ago.

Honestly, that is amazing.

My original code works or better said doesn't work with the material I know at the moment.

Sie sind das Essen und wir sind die Jäger!

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