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Generating an MD5 checksum of a file
...ing (and checking) MD5 checksums of a list of files in Python? (I have a small program I'm working on, and I'd like to confirm the checksums of the files).
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How to get all possible combinations of a list’s elements?
...ave a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.
27 An...
How to determine equality for two JavaScript objects?
...y = function() {
if (c === undefined) c = a * b // imagine * is really expensive
return c;
}
}
In this above case, c is not really important to determine whether any two instances of MyClass are equal, only a and b are important. In some cases c might vary between instance...
Difference between EXISTS and IN in SQL?
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The exists keyword can be used in that way, but really it's intended as a way to avoid counting:
--this statement needs to check the entire table
select count(*) from [table] where ...
--this statement is true as soon as one match is found
exists ( select * from [table] ...
Regular Expression For Duplicate Words
...)\s+\b\1\b/
A good selection of test strings can be found here: http://callumacrae.github.com/regex-tuesday/challenge1.html
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关于我们 · App Inventor 2 中文网，少儿编程陪伴者
...员中心 中文社区 关于 var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?8d287b854d737bdc880e8ddeac1b309d"; var s = document.getElementsByTagName("script")[0]; s.parentNod...
Center image in div horizontally [duplicate]
.../* for the img inside your div */
display: block;
margin: 0 auto;
That's all.
Note, that you'll also have to set an initial min-width for your outer div.
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Detect if stdin is a terminal or pipe?
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Summary
For many use cases the POSIX function isatty() is all what it is needed to detect if stdin is connected to a terminal. A minimal example:
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv)
{
if (isatty(fileno(stdin)))
puts("stdin is co...
Order discrete x scale by frequency/value
... rearrange it so that it is ordered by the value of the y-axis (i.e., the tallest bar will be positioned on the left).
5 An...
How to disable/enable the sleep mode programmatically in iOS?
...back by overriding the viewWillDisappear:
override func viewWillDisappear(_ animated: Bool) {
UIApplication.shared.isIdleTimerDisabled = false
}
More about UIApplication Class.
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