StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
7015705
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-08-10T18:16:32.480
FavoriteCount
0
LastActivityDate
2011-08-10T18:16:32.480
LastEditDate
LastEditorUserId
0
OwnerUserId
655424
ParentId
7015333
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
The second question you ask concerns how large an <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Math.html#ulp%28double%29" rel="nofollow">ulp</a> is in Java. If the ulp exceeds <code>1/(n)</code>, then rounding the multiplication would not recover the original divided int. Typically, larger ulps are associated with larger double values. An ulp associated with a double starts to exceed 1 at around 9E15; if your recovered doubles were around there, then you might finding problems with round() not getting the expected answer. As you are working with int values, though, the largest value of the numerator of your division will be <code>Integer.MAX_VALUE</code>. The following program tests all the positive integer values of <code>n</code> to see which one causes the largest potential for rounding error when trying to recover the divided int: <pre><code> public static void main(String[] args) { // start with large number int m = Integer.MAX_VALUE; double d = 0; double largestError = 0; int bigErrorCause = -1; for (int n = 1; n < Integer.MAX_VALUE; n++) { d = (double) m / n; double possibleError = Math.ulp(d) * n; if (possibleError > largestError) { largestError = possibleError; bigErrorCause = n; } } System.out.println("int " + bigErrorCause + " causes at most " + largestError + " error"); } </code></pre> The output is: <blockquote> int 1073741823 causes at most 4.768371577590358E-7 error </blockquote> Rounding that using Math.round, then casting to int should recover the original int.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POHow does conversion from double to int work in Java?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USAtreys
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POHow does conversion from double to int work in Java?
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.