How to get rid of unwanted decimal numbers

[Nick Hallloran]

Hey everyone,

My program runs perfectly except for one thing. On the result side, the numbers have alot of unwanted decimals. Im looking to go to the tenth value. Any help would be appreciated.

    

public class PiValue {

  public static void main (String [] args){



int number;
double result;

System.out.println("Number \t\t\t Result");



number = 10000;
result = 1;


  while( number <= 100000){


   result = number * 3.14159;


   System.out.println(number + "\t\t\t" + result + "\t\t\t");

number += 10000;


	 }
 }
}
   

Thank you again!

[pawan chopra]

I am not sure what exactly you are looking for but in case you are looking for fixed number of decimal places please have a look at DecimalFormat

[Nick Hallloran]

The problem asks me to list numbers from 10,000 to 100,000 on the left side and the PI value for every 10,000. Everything is correct except for all of the decimal numbers that pop up. for example,
10000 multiplied by PI is 3.1415.8999999998. I have read on this else where, and everyone suggests using the decimal format, DecimalFormat("#,###.##"); , but unfortuantely i have not been taught that yet, so i can't use it. I was thinking of using the % operator..but still cant figure out how to do it.

[Jesper de Jong]

The % (modulo) operator will not help you with this, but I suspect that you mean something else: You can format numbers using String.format(...) or System.out.printf(...), for example:

System.out.printf("%.2f", 3.14159265358);

The Javadoc API documentation of class java.util.Formatter describes the syntax of the format string.

Nick Hallloran wrote:... but unfortuantely i have not been taught that yet, so i can't use it.

You're not allowed to use anything that you haven't been taught? I'd question the quality of your school if learning and discovering things by yourself is discouraged...