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Why should hash functions use a prime number modulus?

...er of buckets. This is convenient and saves having to search around or pre-select a prime number of the right magnitude. So you rely on the hash function not to use even multipliers, which is generally a safe assumption. But you can still get occasional bad hashing behaviours based on hash functions...
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What is the difference between public, protected, package-private and private in Java?

... friends -> "The less you know about it the better" ---> It gives selective visibility, which is still superior to package privacy. In C++, it has its uses, because not all functions can be member functions, and friends is better than public'ing. Of course there is a danger of misuse by evi...
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How do I find Waldo with Mathematica?

...at should have Waldo in it. Exclude all other areas (e.g., for each area, select a circle twice as big as the average person size), and then run the process that @Heike laid out with removing all but red, and so on. Any thoughts on how to code this? Edit: Thoughts on how to code this . . . e...
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Batch script: how to check for admin rights

... after clicking on a start menu icon, then right click on the shortcut and select "Run As Administrator". echo ########################################################## echo. PAUSE EXIT /B 1 ) @echo ON Works on WinXP --> Win8 (including 32/64 bit versions). EDIT: 8/28/2012 Updated...
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C# vs C - Big performance difference

...rdingly, it must call a CRT function that implements sqrt() and checks the selected floating point options to adjust the result. That's slow. share | improve this answer | f...
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Java to Clojure rewrite

... STM transactional behaviour by wrapping any code in a (dosync ...) block. Select the right overall web framework - Clojure has quite a few already but I'd strongly recommend Ring - see this excellent video "One Ring To Bind Them" plus either Fleet or Enlive or Hiccup depending on your templating p...
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How can I provide multiple conditions for data trigger in WPF?

...he user picks a wrong answer it becomes disabled (dimmed out and cannot be selected again). An automated agent has the ability to focus on any particular choice to give an explanation (border highlighted). When the agent focuses on an item, it should not be dimmed out even if it is disabled. All ite...
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Given an emacs command name, how would you find key-bindings ? (and vice versa)

...d bound to a keyboard shortcut (or a key sequence in Emacs terms), see the selected answer. For programmatically getting the command bound to a given key sequence, use the function key-binding or lookup-key that takes a key sequence and returns its bound command. The function key-binding is what C-...
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Things possible in IntelliJ that aren't possible in Eclipse?

...uctors SimpleTimeZone has. After Enter in Eclipse I get the previously selected constructor filled with predefined variable names. And I can see the type of every argument. With Code Recommanders Eclipse guesses the right constructor by the previously defined variable types in the current scope ...
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How can I know which parts in the code are never used?

...instead of exporting (using e.g. -fvisibility=hidden), and then explicitly select the exported functions that you need to export. share | improve this answer | follow ...