StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
18921158
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-09-20T16:04:58.620
FavoriteCount
0
LastActivityDate
2013-09-20T17:36:47.247
LastEditDate
2013-09-20T17:36:47.247
LastEditorUserId
298607
OwnerUserId
298607
ParentId
18920898
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
This is related to the <a href="http://www.python.org/dev/peps/pep-0238/" rel="nofollow">change in the division operator</a> in Python 3 vs Python 2. In Python 2, the <code>/</code> is integer floor division if both numerator and denominator are integers: <pre><code>Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> 2/3 0 >>> 2.0/3.0 0.6666666666666666 >>> >>> 1/2 == 1.0 / 2.0 False </code></pre> Notice that in Python 2, if either numerator or denominator are floats, the result will be a float. But Python 3 changes the <code>/</code> to be 'True Division' and you need to use <code>//</code> to get integer floor division: <pre><code>Python 3.3.2 (default, May 21 2013, 11:50:47) [GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> 2/3 0.6666666666666666 >>> 2//3 0 >>> 1/2 == 1.0/2.0 True >>> 1//2 == 1.0/2.0 False </code></pre> C++ uses floor division between integers: <pre><code>int main() { int n=2; int d=3; cout<<n/d; // 0 } </code></pre> If I run this code (adapted from yours): <pre><code>from __future__ import print_function import math n = 1000000000 if n==0: print('0') else: m = int(math.sqrt(n)) su = int(m*(m+1)/2) s = n-1 i=2 while i*i<=n: k = int(n/i) s = s + ((k-1)*i) + int(k*(k+1)/2) - su i = i+1 print(s) </code></pre> Under Python 3 I get: <pre><code>322467033612360629 </code></pre> Under Python 2 I get: <pre><code>322467033612360628 </code></pre> If you change this line: <code>s = s + ((k-1)*i) + int(k*(k+1)/2) - su</code> to <code>s = s + ((k-1)*i) + int(k*(k+1)//2) - su # Note the '//'</code> it will fix the problem under Python 3
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POSame algorithm in c++ and python but different output
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USdawg
UserOwnerUserId
1. USdawg
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POSame algorithm in c++ and python but different output
 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
 VTAcceptedByOriginator
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

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.