bitwise-operators

Description: I am creating an IP class that first finds the visitor's IP address (using $_SERVER['REMOTE_ADDR'] or getenv('REMOTE_ADDR') ), makes sure it's a valid IP, set's the version (IPv4 or IPv6) to a data member, then it either returns the IP address, or returns the SQL parameter if it's for an SQL query (see createQueryParam() function below for available returns). Question: If the server is not running MySQL 5.6.3+, how can I convert a IPv6 binary stored in the database table ( varbinary(16) ) to a string? For an IPv6 and on systems not running MySQL 5.6.3+ I'd like to return a MySQL

I have converted JavaScript code which uses bit-wise operators in that code to Python code, but there is one problem when i do this in JavaScript and Python 412287 << 10 then I get this 422181888 same results in both languages. but when i do this in both 424970184 << 10 then i get different results in both of the languages 1377771520 in JavaScript and 435169468416 in Python can anybody help me with this? any help would be appreciated. If you want the java-script equivalent value then what you can do is : import ctypes print(ctypes.c_int(424970184 << 10 ^ 0).value) Output: 1377771520 Jean

I've got a long variable and I need to reverse its byte order. For example: B1, B2, ... , B8 I should return a long that consists of B8, B7, ..., B1 . How can I do it by using bitwise operations? Serdalis you can use Long.reverseBytes(long) Or for more methods which include bitwise operations, you can refer to this stack overflow question Heres another method you may like, I'd still recommend the above but it's better than bitwise where you can easily make mistakes. Bytebuffer byte[] bytes = ByteBuffer.allocate(8).putLong(someLong).array(); for (int left = 0, right = bytes.length - 1; left <

How to write unsigned right shift operator in sql server? The expression is like value >>> 0 Here is the e.g. -5381>>>0 = 4294961915 Ed B T-SQL has no bit-shift operators, so you'd have to implement one yourself. There's an implementation of a bitwise shifts here: http://dataeducation.com/bitmask-handling-part-4-left-shift-and-right-shift/ You'd have to cast your integer to a varbinary, use the bitwise shift function and cast back to integer and (hopefully) hey-presto! There's your result you're expecting. Implementation and testing is left as an exercise for the reader... Edit - To try to

I noticed a SSE instruction existed for floating point AND which got me wondering. You can do the same thing with scalars in fp/integer union. The idea struck me that, if you bitwise OR the components of an array of floats, you can determine if any of them are negative quickly by looking at the sign bit of the result. What other uses exist for bitwise operations on floating point values? A lot. For example when you only need to do bitwise operations on a floating-point only instruction set like AVX, then those become very handy. Another application: making constants. You can see a lot of

I was taking a look at A Tour of Go and I was confused by something in their basic-types.go example: MaxInt uint64 = 1<<64 - 1 Shouldn't shifting a 1 64 positions to the left in an unsigned 64 bit integer cause overflow (a.k.a. shifting a bit past the MSB)? However, the compiler doesn't complain until the line is changed to: MaxInt uint64 = 1<<65 - 1 ./basic-types.go:5: constant 36893488147419103231 overflows uint64 If I write some code to iterate over left shifts of varying lengths, including shifting by 65 as in the above example that causes the compiler to barf, I see two things: It behaves