StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
10894701
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-06-05T09:22:04.783
FavoriteCount
0
LastActivityDate
2012-06-05T09:22:04.783
LastEditDate
LastEditorUserId
0
OwnerUserId
1015327
ParentId
10879819
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
Regarding the "math" behind it: It's just the same as in the decimal system: When adding two single digit numbers, two cases have to be considered. Either the sum of the two is a new single digit number (5+4 = 9), or an 'overflow' occurs and another digit is required (5+6 = 11). Note that for any two numbers (in any base, be it 10, 2, 256 or whatever) of <code>n</code> digits length the sum of the two will always be lower than two times the lowest number of <code>n+1</code> digits length; let <code>i</code> and <code>j</code> be numbers (base 10) of, e.g., length 1, that is, both are between <code>0</code> and <code>9</code>, inclusive. As <code>10</code> is the lowest number of length <code>n+1 = 2</code>, their sum will always be lower than <code>2 x 10</code>. When adding two numbers, there may be no overflow or there may be an overflow of exactly 1. The carry bit stores this overflow from the last arithmetic operation; it's either 0 or 1. So, when adding your two numbers of 4x 8 bit each (which can be seen as 4 'digits' base 256), there will be no overflow to be considered for the first addition, hence only <code>ADD</code>; <code>ADD</code> can be regarded as an operation for <code>x = x + y + 0</code>. After the first addition however there may be an overflow which needs to be taken into account, which is done by using <code>ADDC</code>; <code>ADDC</code> represents the operation of <code>x = x + y + carry</code>, where <code>carry</code> can only be 0 or 1 as mentioned above. After all digits have been added, the last addition may have caused an overflow again which will be reflected in the carry bit afterwards and can be evaluated to possibly react to the overflow of the numberrange, like: <pre><code>x = x + y; if ( carry == 1 ) { error "The sum is too big for the datatype of x"; } </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POAdd numbers in AVR assembly
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USJimmyB
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POAdd numbers in AVR assembly
 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
 VTAcceptedByOriginator
2. 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.