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Which is the fastest algorithm to find prime numbers?
...ly I don't think primegen is the fastest, or even the second-fastest; yafu and primesieve are both faster in general, I think, and certainly over 2^32. Both are (modified) sieves of Eratosthenes rather than the Atkin-Bernstein sieve.
– Charles
Aug 19 '11 at 4:...
What's the @ in front of a string in C#?
...string verbatim = @"foo\bar";
string regular = "foo\\bar";
Here verbatim and regular have the same contents.
It also allows multi-line contents - which can be very handy for SQL:
string select = @"
SELECT Foo
FROM Bar
WHERE Name='Baz'";
The one bit of escaping which is necessary for verbatim s...
Which @NotNull Java annotation should I use?
...make my code more readable as well as use tooling like IDE code inspection and/or static code analysis (FindBugs and Sonar) to avoid NullPointerExceptions. Many of the tools seem incompatible with each others' @NotNull / @NonNull / @Nonnull annotation and listing all of them in my code would be t...
How can I search for a multiline pattern in a file?
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This is much easier to understand and uses awk that comes with most *nix systems.
– Ali Karbassi
Jan 28 '11 at 3:12
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Force re-download of release dependency using Maven
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I just deleted my ~/.m2/repository and that forced a re-download ;)
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How to determine if a number is odd in JavaScript
...is will return 0 or 1 (or NaN if you feed it something that isn't a number and can't be coerced into one), which will work fine for most situations. But if you want a real true or false: return (num % 2) == 1;
– T.J. Crowder
Feb 16 '11 at 12:20
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How can I strip first X characters from string using sed?
... a small industrial box. I have a variable containing the text pid: 1234 and I want to strip first X characters from the line, so only 1234 stays. I have more variables I need to "clean", so I need to cut away X first characters and ${string:5} doesn't work for some reason in my system.
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Integer division with remainder in JavaScript?
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For some number y and some divisor x compute the quotient (quotient) and remainder (remainder) as:
var quotient = Math.floor(y/x);
var remainder = y % x;
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How to post pictures to instagram using API
... after a quick search i found that there is no such function in the API :( and it feels weird... because they should provide one. I am not sure if there is any other way (except the apps for android and iOS) to upload picture using php. Kindly give me any sort of idea if there is any possibility.
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Convert string to variable name in python [duplicate]
...mically create a variable, this is not the way to do it; just use setattr. And even when setattr is inappropriate for whatever reason, being explicit and modifying locals or globals as appropriate is still better than exec.
– abarnert
Oct 1 '13 at 17:57
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