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28. Bitwise operators are operators that work on a bit at a time. AND is 1 only if both of its inputs are 1. OR is 1 if one or more of its inputs are 1. XOR is 1 only if exactly one of its inputs are 1. NOT is 1 only if its input are 0. These can be best described as truth tables.
6. Bitwise operators are useful for looping arrays which length is power of 2. As many people mentioned, bitwise operators are extremely useful and are used in Flags, Graphics, Networking, Encryption. Not only that, but they are extremely fast. My personal favorite use is to loop an array without conditionals.
First of all, as you know, negative numbers are expressed as (highest possible unsigned number plus 1 minus value). So -1 in a 16-bit integer, which has the highest unsigned value of 65535, would be 65536-1=65535, i.e. 0xffff in hex, or 1111 1111 1111 1111 in binary. So: 1 in binary = 0000 0000 0000 0001. NOT on all bits would result in 1111 ...
Nov 17, 2009 · With that in mind, another example of bitwise operators is if you have two 4-bit values that you want to pack into an 8-bit one, you can use all three of your operators (left-shift, and and or): packed_val = ((val1 & 15) << 4) | (val2 & 15) The & 15 operation will make sure that both values only have the lower 4 bits.
The &, | and ^ operators in Python work just like in C. The ~ operator works as for a signed integer in C; that is, ~x computes -x-1. You have to be somewhat careful with left shifts, since Python integers aren't fixed-width. Use bit masks to obtain the low order bits. For example, to do the equivalent of shift of a 32-bit integer do (x << 5 ...
Oct 2, 2010 · Use boolean (logical) operators with boolean operands, and bitwise operators with (wider) integral operands (note: False is equivalent to 0, and True to 1). The only "tricky" scenario is applying boolean operators to non boolean operands. Let's take a simple example: 5 & 7 vs. 5 and 7. For the bitwise and (&), things are pretty straightforward:
The Bitwise operators are used to perform operations a bit-level or to manipulate bits in different ways. The bitwise operations are found to be much faster and are some times used to improve the efficiency of a program. Basically, Bitwise operators can be applied to the integer types: long, int, short, char and byte. Bitwise Shift Operators
Apr 2, 2017 · FWIW, there is a real use case for bit-wise operations on floating point (I just ran into it recently) - shaders written for OpenGL implementations that only support older versions of GLSL (1.2 and earlier did not have support for bit-wise operators), and where there would be loss of precision if the floats were converted to ints.
Feb 12, 2016 · The Wikipedia entry on bitwise operator applications has some pseudo code, but it uses the addition operator as well as bitwise operators. – JonMR Commented Dec 16, 2010 at 1:05
Apr 18, 2011 · The way you look at that bit is by using the AND operator of your language. In C and many other languages syntactically derived from B (yes, B), that operator is &. In BASICs, it's usually And. You take your integer, AND it with 1 (which is a number with only the lowest-order bit set), and if the result is not equal to 0, the bit was set.
