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How are software license keys generated?

...t a matter of making up an algorithm for which CD keys (which could be any string) are easy to generate and easy to verify, but the ratio of valid-CD-keys to invalid-CD-keys is so small that randomly guessing CD keys is unlikely to get you a valid one. INCORRECT WAY TO DO IT: Starcraft and Half-li...
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Getting Java version at runtime

... version naming convention. Sun Technical Articles J2SE SDK/JRE Version String Naming Convention Version 1.5.0 or 5.0? "J2SE also keeps the version number 1.5.0 (or 1.5) in some places that are visible only to developers, or where the version number is parsed by programs" "java.version system...
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SQL query to select dates between two dates

...etween '2011/02/25' and '2011/02/27' The date values need to be typed as strings. To ensure future-proofing your query for SQL Server 2008 and higher, Date should be escaped because it's a reserved word in later versions. Bear in mind that the dates without times take midnight as their defaults,...
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Performance optimization strategies of last resort [closed]

...x4 matrices and 4-vectors of floats. Changing the code to carry around the extra empty slot and converting the calculation to floating point from fixed point allowed for a slightly less-accurate but much faster result. – RBerteig May 30 '09 at 2:19 ...
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Turn a string into a valid filename?

I have a string that I want to use as a filename, so I want to remove all characters that wouldn't be allowed in filenames, using Python. ...
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Simple way to encode a string according to a password?

Does Python have a built-in, simple way of encoding/decoding strings using a password? 19 Answers ...
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static const vs #define

... String constants specifically are one of those that might benefit from being #defined, at least if they can be used as "building blocks" for bigger string constants. See my reply for an example. – AnT ...
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Ruby replace string with captured regex pattern

...only seem to be interested in the capture group, note that you can index a string with a regex: "foo"[/oo/] #=> "oo" "Z_123: foobar"[/^Z_.*(?=:)/] #=> "Z_123" share | improve this answer ...
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Writing a compiler in its own language

... assembler. Eventually, you will come to the place where you have to parse strings, specifically escape sequences. You will write code to convert \n to the character with the decimal code 10 (and \r to 13, etc). After that compiler is ready, you will start to reimplement it in C. This process is ca...
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How to bind inverse boolean properties in WPF?

... of effort to separate what they feel is "code" from those poor designers. Extra extra painful when I’m both the coder and the designer. – Roman Starkov Apr 14 '12 at 14:48 10 ...