[Last Call] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

Rounding and Precesion in Javascript

Posted on 2004-04-28
7
Medium Priority
?
244 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
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 12

Accepted Solution

by:
lil_puffball earned 300 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

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

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

International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
This article demonstrates how to create a simple responsive confirmation dialog with Ok and Cancel buttons using HTML, CSS, jQuery and Promises
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…
Suggested Courses

829 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