Solved

Rounding integer value

Posted on 1998-11-04
7
246 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
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

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

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
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…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This video teaches viewers about errors in exception handling.

867 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now