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How to center an iframe horizontally?
...
HTML:
<div id="all">
<div class="sub">div</div>
<iframe>ss</iframe>
</div>
CSS:
#all{
width:100%;
float:left;
text-align:center;
}
div.sub, iframe {
width: 100px;
height: 50px;...
Using parameters in batch files at Windows command line
...s the executable (batch file) name as specified in the command line.
%* is all parameters specified in the command line -- this is very useful if you want to forward the parameters to another program.
There are also lots of important techniques to be aware of in addition to simply how to access th...
Fast way to get image dimensions (not filesize)
...r if it reads the whole data for that though. See the manpage of exiv2 for all supported image formats.
head -n1 will give you the dimensions for PPM, PGM formats.
For formats popular on the web, both exiv2 and identify will do the job.
Depending on the use-case you may need to write your own scri...
Amazon products API - Looking for basic overview and information
...me:
The API you're interested in is the Product Advertising API (PA). It allows you programmatic access to search and retrieve product information from Amazon's catalog. If you're having trouble finding information on the API, that's because the web service has undergone two name changes in recent...
How to modify existing, unpushed commit messages?
... the most recent commit message
git commit --amend
will open your editor, allowing you to change the commit message of the most recent commit. Additionally, you can set the commit message directly in the command line with:
git commit --amend -m "New commit message"
…however, this can make multi-...
Database Design for Revisions?
We have a requirement in project to store all the revisions(Change History) for the entities in the database. Currently we have 2 designed proposals for this:
...
How does the C code that prints from 1 to 1000 without loops or conditional statements work?
...+ (&exit - &main)*0)(j+1);
Which is:
(&main)(j+1);
Which calls main with j+1.
If j == 1000, then the same lines comes out as:
(&main + (&exit - &main)*1)(j+1);
Which boils down to
(&exit)(j+1);
Which is exit(j+1) and leaves the program.
(&exit)(j+1) and...
Function overloading by return type?
Why don't more mainstream statically typed languages support function/method overloading by return type? I can't think of any that do. It seems no less useful or reasonable than supporting overload by parameter type. How come it's so much less popular?
...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...me (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters?
...
My docker container has no internet
I had it working allright but now it stopped. I tried the following commands with no avail:
22 Answers
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