bit arithmetic

This is described in the bit Operations manual for PHP. Example name result$a & $b and (bitwise AND) will set the 1 bit in the $a and $b to 1.$a | $b or (bitwise OR) sets the bit in the $a or the $b as 1 to 1.$a ^ $b Xor (Bitwise XOR) will set the

Bit arithmetic is a kind of old thing passed down from the assembly language generation, only a few 6 operators. At first glance, you will say that it is useless, then you are only half: standing in the current high-level programming point of view,

Bit arithmeticA bitwise operation is a binary representation of a number, a 0 or a 1 operation on each.The first step in understanding bit arithmetic is to understand the binary. Binary means that each digit of the number is 0 or 1. For example,

Bit arithmetic acceleration technique1. If you multiply the value of the previous 2, you can use the left shift operation to accelerate the 300%x = x * 2;x = x * 64;Switchx = x x = x 2. If the number of multiples in addition to the previous 2, you

definition of bit operation: In layman's point, a bitwise operation is a binary operation of an integer in a computer. Any integer can be expressed in two ways, the number of different types of integers, the length of its bits is not the same, INT8

1. Basic ConceptsIf you don't know what a bitwise operation is, then you should look at the basic C-language tutorial first.With operations A & B,or operation a | BXor operation a ^ B,OrYou can also think of arithmetic as the + methodFor example1|2 =

All the numbers in the program are stored in binary form in the computer's memory. Bitwise operations operate directly on the bits of integers in memory. Because bit arithmetic operates directly on memory data, it does not need to be converted to

Bit arithmetic acceleration technique1. If you multiply the value of the previous 2, you can use the left shift operation to accelerate the 300%x = x * 2;x = x * 64;Switchx = x x = x 2. If the number of multiples in addition to the previous 2, you

The problem with bit arithmetic is very simple, the premise is to first familiar with the bit operation, here to use an XOR operation, that is, ^ this symbol, his operation rule is: the same is 0, the difference is 1. After knowing this, it is easy

Basic knowledgeFor bit operations , we are familiar with the basic bit operations with (&&), or (| |), NON (!), XOR (&), and so on. In the interview often appear bit arithmetic related problems, so I did a simple collation, refer to a lot of written

Bit operation can greatly reduce the complexity of the algorithm space, improve efficiency, very ingenious!Let's talk about the simple use of bit arithmetic.1. Bitwise AND &Purpose: Zeroing, taking some of the points in a number positioning,

A lifting bit operation, people often think of its efficiency, whether embedded programming or optimize the system's core code, the proper use of bitwise operations is always a fascinating means, or when you are looking for a job, write the

usually our data table may contain various state attributes, such as the blog table, we need to have a field to indicate whether it is public, whether there is a password set, whether the administrator blocked, whether it is pinned, and so on. Also

/* * 16_ bit arithmetic. c * * Created on:2015 July 6 * author:zhong */#include #include /* bit operation: * The so-called bitwise operation refers to the operation with bits as the object. * The C language bitwise operators are: * & Bitwise AND * |

In computer programs, bits of data are the smallest units of data that can be manipulated, and in theory, "bitwise operations" can be used to complete all operations and operations. The general bit operation is used to control the hardware, or to do

The perverted bit arithmetic of javascriptvar a = "10" | 0;alert (a);Alert (typeof a);The result is 10,number.This means that the statement can convert the string to number.If:var a = "SSS" | 0;alert (a);The result is 0.parseint ("SSS"), it returns

A lifting bit operation, people often think of its efficiency, whether embedded programming or optimize the system's core code, the proper use of bitwise operations is always a fascinating means, or when you are looking for a job, write the

Bitwise operators treat operands as a series of individual bits, rather than as a numeric value. So before this, you have to mention what is "bit":Values or characters are stored in memory as 0 and 1 sequence, each 0 and 1 is called 1 bits, for

C-The bitwise operation of a bit is the operation of a bit (bit). In the section "Binary thinking and data storage", the bit is an electronic component with 8 bits constituting a byte (byte), which is already the smallest operational unit of

The previous two times that was XOR or arithmetic processing. This time I thought it was similar. But I didn't think of it.Gaofu think out of the algorithm, to Bitset, and then add up the same words either 0+0+0 or 1+1+1, the last remaining can be