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Rounding integer value

Posted on 1998-11-04
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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 ...
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Question by:tittapo
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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.
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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);
}
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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
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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;
          }

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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
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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

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