Solved

Rounding and Precesion in Javascript

Posted on 2004-04-28
7
235 Views
Last Modified: 2007-12-19
Hi
I want to format the user entered number with 14 digit precision. I am getting problem if i enter large number and in particular while rounding it.

For Example
123.45 should become 123.45000000000000 This works fine for me.

If I enter 12345.1234567890123456, this is becoming 12345.123456789013 which is wrong.
The number it should show is 12345.12345678901235.

Any Help?
0
Comment
Question by:sk5567
  • 3
  • 2
  • 2
7 Comments
 
LVL 63

Expert Comment

by:Zvonko
ID: 10946528
Perhaps this chart helps you to see what floating point numbers mantissa is:
http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html

0
 
LVL 63

Expert Comment

by:Zvonko
ID: 10946539
0
 
LVL 1

Expert Comment

by:yoshi78
ID: 10952422
Just a suggestion as I'm not in tune with what Zvonko is saying.
1234.12345678901234

array = split()
array(1) = array(1) * 10000   // = 1234.568901234
array2 = split(array(1))
array2(1) = array2(1)*10000 // = 5678.901234

until you get to something managable maybe.
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 12

Accepted Solution

by:
lil_puffball earned 100 total points
ID: 10965133
Check out this example:

<script>
function round(num,n){
  num=(num+'').split('.');
  var dec=num[1];
  if(!dec||dec.length<=n){return num.join('.');}
  while((dec+'').length>n){
    dec=Math.round(dec/10);
    if(dec<10){break;}
  }
  if(n==0){return Math.round(num[0]+'.'+dec);}
  return num[0]+'.'+dec;
}
function format(num,n){
  num=round(num,n);
  num=(num+'').split('.');
  var dec=num[1];
  if(n==0){return num[0];}
  if(!dec){dec='0';}
  while((dec+'').length<n){dec+='0';}
  return num[0]+'.'+dec;
}
</script>

<form>
<input type=text name=num value="12345.1234567890123456" size=30>
<input type=text size=2 value=14 name=n>
<input type=button value="Round" onclick="alert(format(this.form.num.value,this.form.n.value));">
</form>
0
 
LVL 1

Expert Comment

by:yoshi78
ID: 10967279
exactly!

Good Job lil_puffball
0
 
LVL 12

Expert Comment

by:lil_puffball
ID: 10968476
thank you, yoshi. :)
0
 
LVL 12

Expert Comment

by:lil_puffball
ID: 10981071
sk5567,
Is there any reason for the B? :(
0

Featured Post

Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, we'll look how to sort an Array in JavaScript, including the more advanced techniques of sorting a collection of records either ascending or descending on two or more fields. Basic Sorting of Arrays First, let's look at the …
This article discusses how to create an extensible mechanism for linked drop downs.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question