Solved

Rounding integer value

Posted on 1998-11-04
7
250 Views
Last Modified: 2010-08-05
How can can I round integer values f.ex.
768 to 800 and 732 to 700 or 56 to 60 ...
0
Comment
Question by:tittapo
  • 3
  • 2
  • 2
7 Comments
 
LVL 1

Expert Comment

by:omok
ID: 1226917
Try this method:
private int round( double num )
{
      if ( num >= 10 ) {
            return round( (double)num / 10 ) * 10;
      }
      return (int)Math.round(num);
}
Hope this helps.
0
 

Author Comment

by:tittapo
ID: 1226918
hey omok.
your code gave me number 689 when I called it with 689 not 700.

private int round( double num )
   {
   if ( num >= 10 ) {
   return round( (double)num / 10 ) * 10;
   }
   return (int)Math.round(num);
}
0
 
LVL 8

Accepted Solution

by:
diakov earned 20 total points
ID: 1226919
public static int round (int i)
{
  int mod = i % 100;
  return (mod >= 50)?(i + (100 - mod)):( i - mod);
}

This will accomplish your quest.

Cheers,
  Nik
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:tittapo
ID: 1226920
Comment.
Thank' s for answers.
Actually that code was usuful for my purpose.

if ((maxnumber>=100) && (maxnumber<1000))
          {
            maxnumber = (int)(maxnumber/100)*100;
          }
if ((maxnumber>=10) && (maxnumber<100))
          {
            maxnumber = (int)(maxnumber/10)  * 10;
          }

0
 
LVL 1

Expert Comment

by:omok
ID: 1226921
tittapo,
Are you sure my method doesn't work?
I have written a test program and tested it before I posted it here???
I am using JDK1.1.7 on NT4
0
 
LVL 1

Expert Comment

by:omok
ID: 1226922
tittapo,
I don't think your code will work as (maxnumber/10) will always round down because you are doing Integer division.
Try 49, it will give you 40 instead of 50.
0
 
LVL 8

Expert Comment

by:diakov
ID: 1226923
public static int round (int i)
{
  if (i >= 100)
  {
    int mod = i % 100;
    return (mod >= 50)?(i + (100 - mod)):( i - mod);
  }
  else
  {
    int mod = i % 10;
    return (mod >= 5)?(i + (10 - mod)):( i - mod);
  }
}


2-nd attempt.

Cheers.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
How do I remove an object from a 3 53
swing controls 2 23
jmeter usage 4 37
junit as external jar or library 7 39
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
The viewer will learn how to implement Singleton Design Pattern in Java.

733 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