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    What is ASCII code?

    What is ASCII code? ASCII Definition and the complete character set chart. American Standard Code for Information Interchange.

    What Is ASCII (American Standard Code For Information Interchange)?

    Did U KnowJul 31, 2019

    Today I have chosen a very basic topic to explain – what is the ASCII code?


    The full name of ASCII is “American Standard Code for Information Interchange”. It developed by the “American National Standards Institute” (ANSI).

    American Standard Code for Information Interchange is the most general format for text files in computers and on the Internet. In ASCII files, each alphabetic, numeric, or special character is represented with a 7-bit binary number (a string of seven 0s or 1s). 128 possible characters are defined.

    So, the American Standard Code for Information Interchange uses 7-bit binary code to represent text in the computer. Whatever we write on the computer today, it is written in ASCII. The ASCII code represents the representation of computers in other computers using text, communication equipment, and text. The most common text file format used on a computer is.

    Each computer user can operate the computer by creating code, based on the binary system for digits and letters and symbols. However, its code will only apply to the programs and commands given by that user. it does not allow other computer users to exchange mutual information unless they are familiar with the code signals used by each other.

    In order to facilitate the exchange of information, a standard code has been prepared in the United States of America, which is now recognized worldwide, it is known as ASCII.

    For example – ‘A’ has code value 65. In it, each digit (letter) and symbol is represented by 8 bits. in these 8 places, only 0 and 1 numbers are written. This computer contains a character encoding scheme. Text files stored in this code format is called ASCII files.

    See the list below which shows ASCII Value for any Character –

    ASCII Value table Source: wiki


    One bit (binary digit) is the smallest unit of data in the computer. It is a binary value, either a big difference between 0 or 1. and a byte, 1 byte is very big with 1 bit – eight times bigger. in fact, there are eight bits in each byte. Every letter, number or special mark pressed with the keyboard in the computer’s memory is stored in ASCII code. In this code system, each code is of 8 bytes. thus, to conserve any letter in memory, 8 bits consist of 1 byte.

    What is ‘+’ character?

    In addition to numbers, this is a sign that is used to describe language and meaning. For example, we see

    1 2 3 4

    a b c d e f g h i j k l m n o p q r s t u v w x y z

    A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

    0 1 2 3 4 5 6 7 8 9 ! @ # $ % ^ & * ( )

    _ – = | \ ` , . / ; ‘ [ ] { } : ”  < >  ?

    ASCII contains 256 codes, the value of the standard ASCII code is 0 to 127, while from 128 to 256, the Character Extended ASCII characters are set. Computer systems generally use the American Standard Code for Information Interchange code to store characters. Each letter is stored using 8 bits.

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    What is ASCII (American Standard Code for Information Interchange)?

    ASCII (American Standard Code for Information Interchange) defines data encoding on the internet. Find out what ASCII is, how it works and how to use it.


    ASCII (American Standard Code for Information Interchange)

    Peter Loshin, Senior Technology Editor

    What is ASCII?

    ASCII (American Standard Code for Information Interchange) is the most common character encoding format for text data in computers and on the internet. In standard ASCII-encoded data, there are unique values for 128 alphabetic, numeric or special additional characters and control codes.

    ASCII encoding is based on character encoding used for telegraph data. The American National Standards Institute first published it as a standard for computing in 1963.

    Characters in ASCII encoding include upper- and lowercase letters A through Z, numerals 0 through 9 and basic punctuation symbols. It also uses some non-printing control characters that were originally intended for use with teletype printing terminals.

    ASCII characters may be represented in the following ways:

    as pairs of hexadecimal digits -- base-16 numbers, represented as 0 through 9 and A through F for the decimal values of 10-15;

    as three-digit octal (base 8) numbers;

    as decimal numbers from 0 to 127; or

    as 7-bit or 8-bit binary

    For example, the ASCII encoding for the lowercase letter "m" is represented in the following ways:

    Character Hexadecimal Octal Decimal Binary (7 bit) Binary (8 bit)

    m 0x6D /155 109 110 1101 0110 1101

    ASCII characters were initially encoded into 7 bits and stored as 8-bit characters with the most significant bit -- usually, the left-most bit -- set to 0.

    Why is ASCII important?

    ASCII was the first major character encoding standard for data processing. Most modern computer systems use Unicode, also known as the Unicode Worldwide Character Standard. It's a character encoding standard that includes ASCII encodings.

    The Internet Engineering Task Force (IETF) adopted ASCII as a standard for internet data when it published "ASCII format for Network Interchange" as RFC 20 in 1969. That request for comments (RFC) document standardized the use of ASCII for internet data and was accepted as a full standard in 2015.

    ASCII encoding is technically obsolete, having been replaced by Unicode. Yet, ASCII characters use the same encoding as the first 128 characters of the Unicode Transformation Format 8, so ASCII text is compatible with UTF-8.

    In 2003, the IETF standardized the use of UTF-8 encoding for all web content in RFC 3629.

    Almost all computers now use ASCII or Unicode encoding. The exceptions are some IBM mainframes that use the proprietary 8-bit code called Extended Binary Coded Decimal Interchange Code (EBCDIC).

    How does ASCII work?

    ASCII offers a universally accepted and understood character set for basic data communications. It enables developers to design interfaces that both humans and computers understand. ASCII codes a string of data as ASCII characters that can be interpreted and displayed as readable plain text for people and as data for computers.

    Programmers use the design of the ASCII character set to simplify certain tasks. For example, using ASCII character codes, changing a single bit easily converts text from uppercase to lowercase.

    The capital letter "A" is represented by the binary value:

    0100 0001

    The lowercase letter "a" is represented by the binary value:

    0110 0001

    The difference is the third most significant bit. In decimal and hexadecimal, this corresponds to:

    Character Binary Decimal Hexadecimal

    A 0100 0001 65 0x41 a 0110 0001 97 0x61

    The difference between upper- and lowercase characters is always 32 (0x20 in hexadecimal), so converting from upper- to lowercase and back is a matter of adding or subtracting 32 from the ASCII character code.

    Similarly, hexadecimal characters for the digits 0 through 9 are as follows:

    Character Binary Decimal Hexadecimal

    0 0011 0000 48 0x30 1 0011 0001 49 0x31 2 0011 0010 50 0x32 3 0011 0011 51 0x33 4 0011 0100 52 0x34 5 0011 0101 53 0x35 6 0011 0110 54 0x36 7 0011 0111 55 0x37 8 0011 1000 56 0x38 9 0011 1001 57 0x39

    Using this encoding, developers can easily convert ASCII digits to numerical values by stripping off the four most significant bits of the binary ASCII values (0011). This calculation can also be done by dropping the first hexadecimal digit or by subtracting 48 from the decimal ASCII code.

    Developers can also check the most significant bit of characters in a sequence to verify that a data stream, string or file contains ASCII values. The most significant bit of basic ASCII characters will always be 0; if that bit is 1, then the character is not an ASCII-encoded character.

    ASCII variants and Unicode

    When it was first introduced, ASCII supported English language text only. When 8-bit computers became common during the 1970s, vendors and standards bodies began extending the ASCII character set to include 128 additional character values. Extended ASCII incorporates non-English characters, but it is still insufficient for comprehensive encoding of text in most world languages, including English. Different extended ASCII character sets are common, depending on the vendor, language and country.

    Initially, other character encoding standards were adopted for other languages. In some cases, the standards were designed for other countries with different requirements. In other cases, the encodings were hardware manufacturers' proprietary designs.

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