bitwise computers

Today you see a piece of code in the project:if (~key.indexof (' I ')) { Pricetagdata.adulti = { tag:key, price:value}}I say to this operator is very strange, naturally also can not understand the author's intentions. Now that my curiosity is in a vigorous period, I decided to learn the usefulness of this operator.Looked at the eye ES5, originally it is the bit to take the counter-operator. The following is a description of the ES5 operator:

This article describes how to handle C # bitwise operations. The first step is to create an enumeration to indicate all permission management operations, followed by permission calculation. This article describes how to handle C # bitwise operations. The first step is to create an enumeration to indicate all permission management operations, followed by permission calculation. Common

Javascript bitwise left shift operator ( This article mainly introduces the Javascript bitwise left shift operator ( Bitwise left shift operator ( Left shift expression bit. Result = expression1 Parameters Result Any variable. Expression1 Any expression. Expression2 Any expression. Description Var temp Temp = 14 The value of the temp variable is 56,

Simple Application of enumeration, bitwise AND or operation, and displacement, and enumeration operation When writing a program, we often encounter various settings, for example, set the dock status of the four sides of the window (for example, whether the top side is docked on the top of the parent control, whether the left side is docked on the left side of the parent control, and whether the right side is docked on the right side of the parent Cont

//Main.mLessonc12//Created by Zhang Yangji on 15-1-6.Copyright (c) 2015 Zhang Yangji. All rights reserved.//#import #define KdebugWhen a variable has a fixed number of values, you can define an enumeration typeEnumeration types declare a set of constants that establish a correspondence between a person's readable identifier and a number that a computer can read.If the enumeration type does not specify a constant, the default starts at 0, plus 1Enum season{Spring = 1,SummerAutumn = 4,Winter//};ty

C # bitwise operators , |, ^, We know that any information in the computer is saved in binary form. The bit operator is the logarithm.The bitwise operators in the C # language are Unlike | or ^ Or ~ Complement The complement operation only has one operand, while other bitwise operators both have two operands.The operand of the overflow

Writer:bysocket (mud and brick pulp carpenter)Weibo: BysocketWatercress: BysocketFacebook:bysocketTwitter:bysocketMasons like Java, and the article always pulls Java. I/O basis is the binary, which is the Bit.Bit vs. binaryWhat is a bit (bit)? Bit is the unit of CPU processing or the smallest data storage. It is similar to a small, small switch that is opened and closed, and is expressed as 1 or 0. So this is the "cell" in which the computer processes any data, so keep in mind.The binary system

4.1.2 Bitwise operators and | Operators also have a role in performing operations on numeric values. When used in this way, they deal with a series of bits stored in a variable, rather than variable values, so they are called bitwise operators.Let's discuss and | below. The operator each bit in the first operand is compared to a bit in the same position in the second operand, and in the resulting result,

Bitwise operators are:The following experiments are done to learn these kinds of operationsThe following data types are int with 32 bit representation, binary right 0 omittedBinary representation of 21 and-21System.out.println (Integer.tobinarystring (21)); 10101System.out.println (Integer.tobinarystring (-21)); 11111111111111111111111111101011　　System.out.println ("System.out.println (" -21 -21 >> sign bit to the left high fill sign bit move n bits d

not given in the class declaration, when f is defined outside the class,Void A: f () indicates that the f () function is A member function of Class. (2) It is used directly before the global function to indicate that it is a global function.For example, in VC, you can add :: (3) Reference member functions and variables, and scope member operators For example, System: Math: Sqrt () is equivalent to System. Math. Sqrt () 3. c/c ++ bitwise domain struc

One, the binary1. What is a binary* is a way of counting, the representation of a numeric value2. Binary* Features: only 0 and 1, every 2 into 1 * Writing format:0b or 0b start * Application: Binary instruction \ binary file, variable in memory is binary storage 3. octal * Features:0~ 8 in 1 * Writing format:0 start 4. hex * Features:0~f, 1 in every * Writing format:0x or 0x start Second, bitwise operations1. Press at 1> featu

1. Bitwise AND operator ()Since any one is the result of the 0, operation, it is 0, so you can use this operator to set the unnecessary bits in the variable to 0. The method is to create a ' mask ' and then use to combine it with the original variable. such as: Letter=letter 0x0F;2. Bitwise OR operator (|)One of the two bits is the result of the 1,or operation is 1, so the result of these two variables is

It becomes easy to understand the processing of these two permissions, as long as the user's current total permission value and the permissions required for the current operation are bitwise and computed each time a permission operation is executed. If the result is true, you can handle false errors. (of course, you can design a program without permission) first, we define four constants to set four permissions: =======================================

1. Not Bit operators not from ~ The essence of the. Not operator is to calculate a negative number and then subtract 1. The bitwise operator not is a three-step process. A. Convert the operator to a 32-bit number. B. Convert the binary form into its binary anticode C. Convert the binary back code to a floating point number. Example: VaR num = 10; document. Write (~ Num ); Result: -11 2. and

Now there's a bunch of numbers, $str =1300022332121 Ask for a bitwise to reverse how to get This bitwise counter, and the other program's bitwise reverse, there is a difference? Because I'm going to be able to pass him to C + + writing program, Please teach the Heroes Reply to discussion (solution) $str =1300022332121;echo ~ $str; 2147483647 PHP

I. background In work, the database used is MySQL, the project uses Java, and the JPA technology is used. Hibernate is used at the underlying layer. Some projects need to perform bitwise AND operations, but the hql language does not support it. This article describes how to enable our program to support bitwise AND operations. II. Implementation Preferred sqlfunction interface implementation Package