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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.
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.
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.
Jun 2, 2013 · Assume that the value of test is 1 or 0. Here I can implement the following if statement using bitwise operators as below.
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 ...
0. Subtracting 1 from a positive "power of 2" number will always unset the top bit (which is the ONLY non-zero bit in "power of 2" numbers) and will set all lower bits to "1". Therefore, the AND operation always returns 0 for "power of 2" numbers. That explains how the "power of 2" is detected by looking for 0.
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
Jun 19, 2010 · Using bitwise_and, bitwise_or, and bitwise_not you can modify any bit configurations to another bit configurations (i.e. these set of operators are "functionally complete"). However, for operations like modulus, the general formula would be necessarily be quite complicated, I wouldn't even bother trying to recreate it.
Aug 7, 2010 · Here is a quote from the book: The Bitwise AND Operator. Bitwise ANDing is frequently used for masking operations. That is, this operator can be used easily to set specific bits of a data item to 0. For example, the statement. w3 = w1 & 3; assigns to w3 the value of w1 bitwise ANDed with the constant 3.
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.
