Question

printing out double to 2 decimal places

Asked by: cnc2man66

I am making a simple prgram in NetBeans that asks for order amount and then outputs order amount plus shipping charge if order is under $25. The proble is that the output is not in a dollar format or 2 decimal places. It outputs one decimal place, or if the user inputs 28.6795 then the pogram outputs that number. I am a true beginner at this, as in only a couple of days, and I cannot seem to get a complete answer.

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Asked On
2008-12-06 at 20:04:44ID23963694
Tags

Java with NetBeans 6.5

Topics

NetBeans IDE

,

Java Editors & IDEs

,

Java Programming Language

Participating Experts
4
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Answers

 

by: dnunes_brPosted on 2008-12-06 at 20:10:15ID: 23114717

 

by: cdittbernerPosted on 2008-12-19 at 15:31:10ID: 23216337

Use java.text.DecimalFormat to do the work for you:


 	public static void main(String[] args) {
		java.text.DecimalFormat format = new java.text.DecimalFormat("#,##0.00");
		System.out.println( format.format(10000000.67890)); 
		// output is "10.000.000,68"
	}
                                              
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by: mwvisa1Posted on 2009-01-07 at 16:52:18ID: 23321223

cdittberner's suggestion works great, just replace his example code with your order amount variable.

 

by: mwvisa1Posted on 2009-01-07 at 16:54:05ID: 23321228

Try this and you will see that his suggestion works.
(see my other comments in code as I simplified so only had to implement the code in one place instead of two.)

public static void main(String[] args) {
 
        double orderAmount = 0.00;
        Scanner keyboard = new Scanner(System.in);
 
        System.out.println("Enter order amount: ");
        orderAmount = keyboard.nextDouble();
 
        if (orderAmount >= 25) {
 
            System.out.println("You qualified for free shipping: ");
        // orderAmount = orderAmount - 8.95;
        // don't add shipping, but don't give discount!
        } else {
 
            System.out.println("Sorry, you did not qualify for free shipping. ");
            orderAmount = orderAmount + 8.95; // add shipping
 
        }
        java.text.DecimalFormat format = new java.text.DecimalFormat("#,##0.00");
        System.out.println("Your order total is: $ " + format.format(orderAmount));
        System.out.println("Thank you for your order");
 
    }

                                              
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by: contactkarthiPosted on 2009-01-07 at 17:03:37ID: 23321277

below is the piece of code that will format it to 2 decimal places..


also if you see your code if the order is 25 or more you are subtracting 8.95 for shipping which is wrong. say if the order is $25 you endup charging $16.05 as you subtract 8.95 and say free shipping. you should just say the amount and free shipping and not subtract here.

dont for get to import java.text.DecimalFormat;

also have a look at http://java.sun.com/j2se/1.4.2/docs/api/java/text/DecimalFormat.html for more options

      DecimalFormat df2 = new DecimalFormat( "#,###,###,##0.00" );
  orderAmount =new Double(df2.format(keyboard.nextDouble())).doubleValue(); 
                                              
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