StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
9376231
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-02-21T10:50:16.020
FavoriteCount
0
LastActivityDate
2012-02-21T11:19:51.093
LastEditDate
2012-02-21T11:19:51.093
LastEditorUserId
45603
OwnerUserId
45603
ParentId
9376035
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
In a C program the OS creates an array of pointers to zero terminated strings. The count is passed as <code>argc</code> and the array is passed as <code>argv</code>. You already know this. The names <code>argc</code> and <code>argv</code> don't matter. You can use any name. The data types and the order do matter... <code>argv</code> must be <code>int</code> and <code>argc</code> must be <code>char*[]</code> or <code>char**</code>. Other languages have similar mechanisms. For example C# passes a single <code>string[]</code> argument which is a .NET array and keeps track of it's length internally. More information is available here: <a href="http://en.wikipedia.org/wiki/Main_function#C_and_C.2B.2B" rel="nofollow">http://en.wikipedia.org/wiki/Main_function#C_and_C.2B.2B</a> Environment variable names are separate from names of variables in your program. <code>argc</code> and <code>argv</code> are not environment variables... they are variables local to <code>main()</code>. To access environment variables use <code>getenv()</code>. Update: You wanted to know how these are made available to the program. It is the OS which does that. But before the OS can do so, the program invoking your executable -- the caller -- gets to process your command line. Usually the caller is a shell (<code>bash</code>, <code>csh</code>, <code>zsh</code>, <code>cmd.exe</code>) or a desktop environment like GNOME or Windows Explorer. The caller passes these arguments via <a href="http://linux.die.net/man/2/execve" rel="nofollow">execve</a> (on *nix) or <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx" rel="nofollow">CreateProcess</a> (on Windows).
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POHow do command line arguments work?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USAgnel Kurian
UserOwnerUserId
1. USAgnel Kurian
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
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
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.