A bitwise operation. Programming in C and C++

Date:

2018-03-20 11:09:25

Views:

520

Rating:

1Like 0Dislike

Share:

Table of contents:

Bitwise operation is the operation used for performing operations on bit patterns or binary numbers, which include working with individual bits. This is a quick, simple action directly supported by the processor used to manipulate values for comparisons and calculations.

Calculations

A Binary digital system uses only two digits-0 and 1. Computers work in binary, meaning they store data and perform calculations using only zeros and ones.bitwise

Although one binary digit can be used to represent True (1) (true) or False (0) (false) logic to store large numbers and perform complex functions, you can use multiple binary digits. In fact, any number can be represented in binary format.

Usage

The Bitwise operators are used in the following areas:

  • Communication stacks where the individual bits in the header attached to the data that carry important information.

  • The Built-in software to control various functions in the chip and indicate the status of hardware by controlling the individual bits of hardware registers of embedded microcontrollers.

  • Low-level programming for applications such as device drivers, cryptographic software, software for video decoding, memory managers, software compression and graphics.

  • Convenient management of large sets of integers in the problems of search and optimization.

  • Bitwise operations performed on bit flags, which can enable an instance of enumeration type to store any combination of values defined in the enumerator-list.

programming in c

Bitwise operations — how it works?

In contrast to the usual Boolean operators (e.g. +, -, *), which work with bytes or groups of bytes, bitwise operators you can check or set each of the individual bits in a byte. Bitwise operations never cause overflows in the memory cells, because the result obtained after the operation is within the range of possible values for a numeric type.

Recommended

How to get out of

How to get out of "Skype" on the "Android" and not only

How to get out of "Skype" "Android"? This question bothers many users. The thing is that the messenger is not so difficult. But there are features that are only for mobile versions. To log out of Skype in this case more difficult than it seems. But i...

Kingo ROOT: how to use the program to gain administrative rights on Android

Kingo ROOT: how to use the program to gain administrative rights on Android

The Gadgets on the platform Android regained the lion's share of the market. Developers are continually perfecting the OS, trying to fit the needs of the users, but from year to year admit palpable mistake: forbid the owner to "stuffing" of his gadge...

How to get from Stormwind to Tanaris: practical tips

How to get from Stormwind to Tanaris: practical tips

World of Warcraft is an iconic MMORPG, uniting millions of players around the world. There are many locations and puzzles, secret trails and larger, but rather dangerous paths. Sooner or later, every player chose the side of the Alliance, we have to ...

The Bitwise operators used in the C family of languages (C #, C and C ++):

  • OR (|) — the result is true if either operand is true.

  • AND (&) — a result of true only if both operands are true. It can be used to configure the validation mask of the values of certain bits.

  • The XOR (^) — the result is true only if one of its operands is true. It is primarily used to toggle certain bits. It also helps to replace two variables without using a third.

  • NOT (~) — the bitwise complement or inversion. Provides the bitwise complement of the operand by inverting its value, so that all zeros are converted into units, and all ones become zeroes.

  • >> (Right Shift) and << (Left Shift) — the operator which moves bits to the number of positions specified by the second operand to the right or left direction. The shift operators are used to align the bits.

bitwise operations in C

Sample work

Bitwise operators — these are the symbols that represent actions that must be performed on the individual bits. A bitwise operation works on two-bit patterns of equal length, positioning their individual bits:

Logical AND operation (&) of each bit pair leads to 1 (true) if the first and second bits are equal to 1. Otherwise the result is zero. Among other applications AND can be used to check individual bits in the bit string, to see whether they are true or false value.

Let us Consider an example:

IsOdd = (ValueToTest & 1)! = 0.

Logical OR (|) bit of each pair leads to 1 if the first or second bit is 1. Otherwise the result is zero. Logical operation XOR (~) of each bit pair leads to 1 if the two bits are different and 0 if they are equal.

The Logical NOT operator is represented as ^. Left shift (<<), right shift (>>) and right shift zero fill (>>>>) are sometimes referred to as bitwise operators are called shift operators bits.bitwise operations in java

Prioritize

Order of priority (highest to lowest) in bitwise operators while programming in C

  • NOT;

  • Right-Shift and Left-Shift);

  • AND;

  • XOR

  • OR.

These operands are used in most programming languages. For example, when writing code in Javascript, bitwise operation will be the same as the above. This is caused by the underlying mathematical foundations that underpin the code. In particular, bitwise operations in Java, in turn, is completely identical to Javascript.

Bits and programming in C and other languages

Bit is the smallest unit of measurement used to quantify computer data. It contains a single binary value-0 or 1.
Although a single bit can determine the logical value True (1) or False (0), as a separate unit it is rarely used. Therefore, in the computer storage bits are often grouped into 8-bit clusters calledbytes. Since a byte contains eight bits, each of which has two possible values, in bitwise operations in C (a programming language) one byte can have 28 or 256 different values.bitwise javascript
The Terms “bits” and “bytes" is often confused and even used interchangeably, since both sound the same and decrease with the letter “B”. However, the correct spelling of bits are reduced in lower case “b”, and the bytes are reduced in upper case — “B”. It is important not to confuse these two terms, since any measurement in bytes contains eight times more bits. For example, a small text file with a size of 4 KB contains 4,000 bytes, or 32,000 bits.

Usually, files, storage devices and storage capacity are measured in bytes, but data transfer speeds are measured in bits. For example, memory card, SSD may have a capacity of 240 GB, whereas the load can be transported at a speed of 10 Mbps. in addition, bits can also be used to describe the architecture of the processor, such as 32-bit or 64-bit processor.

Bitwise operations in Pascal

A Bitwise level operations in Pascal includes working with individual bits, which are the smallest unit of computer data. Although computers are able to manipulate bits, they generally store data and execute instructions in bit multiples of the values called bytes. Most programming languages, including bitwise operations in Delphi, control groups of 8, 16, or 32 bits.

Process Description

A Bitwise operator is a symbol that represents an action that works with data at the bit level, not byte or larger data unit, as is more common.bitwise operations in Pascal

The Most common operators work with one or more bytes, most systems contain eight bits. Because they provide more accuracy and require less resources, the bitwise operators can make your code faster and more efficient. Examples of the use of bitwise operations include:

  • Encryption.

  • Compression;

  • Schedule;

  • Connectivity on ports/sockets;

  • Embedded systems programming;

  • A machine with a finite state.

Bitwise operator works on the binary representation of the number, not its value. The operand is treated as bit set, and not as a single number. The bitwise operators are similar in most languages that support them — C, Java, JavaScript, Python and Visual Basic.

Why is it important to use?

Bitwise operations are absolutely necessary when programming hardware registers in embedded systems. Each processor has one or more registers (usually, a certain memory address) that control whether an interrupt or disabled. To allow the interrupt to run a process, you must set the enable bit for this interrupt, and most importantly, not be changed by any of the other bits in the register.delphi bitwiseWhen an interrupt is triggered, it usually sets a bit in the status register so that one service procedure can determine the exact cause of the interrupt. Testing individual bits allows you to quickly decode a source of interrupts.
In many embedded systems, the total available RAM can be 64, 128 or 256 bytes. In this environment typically uses a single byte to store multiple data items and Boolean flags, and then uses bitwise operations to set and read them.


Article in other languages:

AR: https://www.tostpost.com/ar/computers/8584-c-c.html

BE: https://www.tostpost.com/be/kamputary/15383-pab-tavae-aperacy-pragramavanne-na-c-c.html

DE: https://www.tostpost.com/de/computer/15386-bitweise-operationen-programmieren-in-c-und-c.html

ES: https://www.tostpost.com/es/los-ordenadores/15397-pobitovye-de-la-operaci-n-programaci-n-en-c-y-c.html

HI: https://www.tostpost.com/hi/computers/8592-a-bitwise-operation-programming-in-c-and-c.html

JA: https://www.tostpost.com/ja/computers/8589-c-c.html

KK: https://www.tostpost.com/kk/komp-yuterler/15383-pobitovye-operacii-ba-darlamalau-t-l-c-zh-ne-c.html

PL: https://www.tostpost.com/pl/komputery/15360-zachowanie-operacji-programowanie-w-j-zyku-c-i-c.html

PT: https://www.tostpost.com/pt/computadores/15355-opera-es-bit-a-bit-programa-o-em-c-e-c.html

TR: https://www.tostpost.com/tr/bilgisayarlar/15387-bitsel-i-lemler-programlama-c-ve-c.html

UK: https://www.tostpost.com/uk/komp-yuteri/15372-pob-tov-operac-programuvannya-na-c-ta-c.html

ZH: https://www.tostpost.com/zh/computers/9333-c-c.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

Comments (0)

This article has no comment, be the first!

Add comment

Related News

iOS 9 for iPhone 4S reviews, description, features, and updates

iOS 9 for iPhone 4S reviews, description, features, and updates

At the annual WWDC in 2015 were presented for 9 account version of the mobile operating system from Apple. The software was well received and many intrigues, including the support of quite old gadgets, including the iPad 2nd gener...

My family, Windows Phone: customize. Set up My family on Windows Phone

My family, Windows Phone: customize. Set up My family on Windows Phone

today's mobile phones based on Windows Phone operating system (update every machine depends on its technical characteristics) occupy a considerable segment of the market of mobile phones. I would like to note that they are positio...

Several reasons why keyboard does not work on the computer

Several reasons why keyboard does not work on the computer

the Man, suddenly found that has stopped working the keyboard on the computer, few people would envy. And, as is often the case, such troubles most often happen just when the “burn” the submission of reports, is to run...

Laptop Apple MacBook Air 13 review, description, user reviews

Laptop Apple MacBook Air 13 review, description, user reviews

Apple Developers usually modify something in the updates only when needed for the best functionality. This fact may explain the incremental and the very impressive upgrading of the 13-inch Apple MacBook Air ($ 999). While the devi...

Error 651 in Windows 7: what is it?

Error 651 in Windows 7: what is it?

have you ever had the situation when when Internet connection you see an error window? And retrying the connection does not give any changes. Such a shame can greatly harass the enemy or to disrupt all your plans. Today we will lo...

As in

As in "cs:GO" to create a map: a basic manual

Valve creates games where players have a huge scope for creativity: what is Steam workshop where users can upload their achievements. Counter-Strike: Global Offensive is no exception. Perhaps this is the consequences of the fact t...