Unicode is a character encoding standard that aims to support all languages of the world. It evolved from limitations of earlier standards like ASCII that could only represent English characters. Unicode uses 16-bit or 32-bit encodings to represent over 1 million characters, as opposed to ASCII's 128 characters. Popular Unicode encodings include UTF-8, UTF-16, and UTF-32. The widespread adoption of Unicode has allowed globalization of text and the internet by supporting the simultaneous use of different languages.
The document discusses the Unicode character encoding standard. It describes how earlier 8-bit character encoding systems were limited and could not represent all languages, which led to many conflicting encoding systems. Unicode addressed this by providing a universal encoded character set that could represent every character for all present and historic written languages, with each character assigned a unique numeric value. The Unicode standard aims to facilitate international exchange of text and language-independent software.
Computer programmers developed coding systems to represent letters, numbers, and symbols with numeric codes. Three popular coding systems are EBCDIC, ASCII, and Unicode. EBCDIC used 6-bit codes and could represent 64 symbols, while ASCII is now most common and uses 8-bit codes for 256 symbols. Unicode is an evolving worldwide standard that uses 16-bit codes to represent over 65,000 symbols and characters from different languages.
ASCII is a 7-bit character encoding standard used to represent English text that defines 128 characters including 95 printable characters and 33 non-printing control characters. It was developed by ANSI and while it can only encode basic English text, ASCII was almost universally supported and could represent each character with a single byte, making it important for early digital communication.
The document discusses the architecture and functions of operating systems. It describes operating systems as system software that acts as an interface between hardware and application software. The key functions of operating systems include managing memory, files, devices, and providing common services for application programs. Examples of common operating systems like Windows, UNIX, and VAX/VMS are given.
ASCII is an industry standard 7-bit code developed in 1963 that assigns binary values to letters, numbers, and other characters to represent text and control characters in computing devices. Most computers use the ASCII standard to represent text, allowing data to be transferred between computers. ASCII codes provide a mapping between binary data and human-readable characters so that text can be visually represented on screens and in printouts.
An instruction format consists of bits that specify an operation to perform on data in computer memory. The processor fetches instructions from memory and decodes the bits to execute them. Instruction formats have operation codes to define operations like addition and an address field to specify where data is located. Computers may have different instruction sets.
The document discusses the Unicode character encoding standard. It describes how earlier 8-bit character encoding systems were limited and could not represent all languages, which led to many conflicting encoding systems. Unicode addressed this by providing a universal encoded character set that could represent every character for all present and historic written languages, with each character assigned a unique numeric value. The Unicode standard aims to facilitate international exchange of text and language-independent software.
Computer programmers developed coding systems to represent letters, numbers, and symbols with numeric codes. Three popular coding systems are EBCDIC, ASCII, and Unicode. EBCDIC used 6-bit codes and could represent 64 symbols, while ASCII is now most common and uses 8-bit codes for 256 symbols. Unicode is an evolving worldwide standard that uses 16-bit codes to represent over 65,000 symbols and characters from different languages.
ASCII is a 7-bit character encoding standard used to represent English text that defines 128 characters including 95 printable characters and 33 non-printing control characters. It was developed by ANSI and while it can only encode basic English text, ASCII was almost universally supported and could represent each character with a single byte, making it important for early digital communication.
The document discusses the architecture and functions of operating systems. It describes operating systems as system software that acts as an interface between hardware and application software. The key functions of operating systems include managing memory, files, devices, and providing common services for application programs. Examples of common operating systems like Windows, UNIX, and VAX/VMS are given.
ASCII is an industry standard 7-bit code developed in 1963 that assigns binary values to letters, numbers, and other characters to represent text and control characters in computing devices. Most computers use the ASCII standard to represent text, allowing data to be transferred between computers. ASCII codes provide a mapping between binary data and human-readable characters so that text can be visually represented on screens and in printouts.
An instruction format consists of bits that specify an operation to perform on data in computer memory. The processor fetches instructions from memory and decodes the bits to execute them. Instruction formats have operation codes to define operations like addition and an address field to specify where data is located. Computers may have different instruction sets.
This document discusses different methods for representing data in computers, including numeric and character representations. It covers representing signed and unsigned integers using methods like sign-magnitude, 1's complement, and 2's complement. It also discusses floating point number representation using the IEEE standard. Finally, it discusses character representation using ASCII and Unicode encoding schemes.
George Boole published "An Investigation into the Laws of Thought" in 1854, outlining a system of logic and algebraic language dealing with true and false values. This became known as Boolean logic. Boolean logic uses only true and false values and the basic operations are AND, OR, and NOT. Boolean logic is the basis for modern computing, as electronic circuits can represent Boolean operations using gates. Circuits called AND, OR, and NOT gates perform the corresponding logical operations and form the building blocks for digital logic.
This document provides an introduction and outline for a course on Formal Language Theory. The course will cover topics like set theory, relations, mathematical induction, graphs and trees, strings and languages. It will then introduce formal grammars including regular grammars, context-free grammars and pushdown automata. The course is divided into 5 chapters: Basics, Introduction to Grammars, Regular Languages, Context-Free Languages, and Pushdown Automata. The Basics chapter provides an overview of formal vs natural languages and reviews concepts like sets, relations, functions, and mathematical induction.
Lexical analysis is the first phase of compilation. It reads source code characters and divides them into tokens by recognizing patterns using finite automata. It separates tokens, inserts them into a symbol table, and eliminates unnecessary characters. Tokens are passed to the parser along with line numbers for error handling. An input buffer is used to improve efficiency by reading source code in blocks into memory rather than character-by-character from secondary storage. Lexical analysis groups character sequences into lexemes, which are then classified as tokens based on patterns.
The Pentium processor introduced in 1993 features a superscalar architecture that allows multiple instructions to be executed simultaneously. It has separate 8KB instruction and data caches and a 64-bit data bus. The Pentium uses dynamic branch prediction and out-of-order execution to further improve performance through superscalar design.
An arithmetic logic unit (ALU) is a digital electronic circuit that performs arithmetic and bitwise logical operations on integer binary numbers.
This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units.
A single CPU, FPU or GPU may contain multiple ALUs
History Of ALU:Mathematician John von Neumann proposed the ALU concept in 1945 in a report on the foundations for a new computer called the EDVAC(Electronic Discrete Variable Automatic Computer
Typical Schematic Symbol of an ALU:A and B: the inputs to the ALU
R: Output or Result
F: Code or Instruction from the
Control Unit
D: Output status; it indicates cases
Circuit operation:An ALU is a combinational logic circuit
Its outputs will change asynchronously in response to input changes
The external circuitry connected to the ALU is responsible for ensuring the stability of ALU input signals throughout the operation
Theory of automata and formal languageRabia Khalid
The document discusses theory of automata and formal languages. It defines key concepts like abstract machines, automata, alphabets, strings, words, languages and provides examples to describe them. Abstract machines are theoretical models of computer systems used to analyze how they work. Automata are self-operating machines that follow predetermined sequences of operations. Alphabets are sets of symbols, strings are concatenations of symbols, and words are strings belonging to a language. Languages can be defined descriptively or recursively and examples are given to illustrate different ways of defining languages.
Types of instructions can be categorized into data transfer, arithmetic, and logical/program control instructions. Data transfer instructions like MOV copy data between registers and memory. Arithmetic instructions include INC/DEC to increment/decrement values, ADD/SUB for addition/subtraction, and MUL/DIV for multiplication/division. Logical instructions perform bitwise operations while program control instructions manage program flow.
This document provides an introduction to the theory of automata. It defines key concepts like alphabets, strings, words, and languages. It discusses different ways of defining languages through descriptive definitions. Important examples include the EVEN, ODD, EQUAL and PALINDROME languages. The document also proves that there are equal numbers of palindromes of length 2n and 2n-1. It introduces recursive definitions and regular expressions as additional ways to define languages formally.
The CPU acts as the computer's brain and carries out instructions from programs. It has two main components: the control unit, which selects and coordinates instruction execution, and the arithmetic logic unit, which performs calculations. Registers temporarily store data during instruction processing, including special purpose registers like the program counter, memory address, and accumulator registers. The CPU communicates with main memory, where files and applications are stored, and executes instructions through a multi-step process controlled by the control unit.
The document provides an overview of instruction sets, including:
1) Instruction formats contain operation codes, source/result operand references, and next instruction references. Operands can be located in memory, registers, or immediately within the instruction.
2) Types of operations include data transfer, arithmetic, logical, conversion, I/O, system control, and transfer of control.
3) Addressing modes specify how the target address is identified in the instruction, such as immediate, direct, indirect, register, register indirect, displacement, and stack addressing.
The main Objective of this presentation is to define computer buses , especially system bus . which is consists of data bus , address bus and control bus.
This document provides an overview of the history and development of computer architecture. It begins with some of the earliest computing devices like the abacus and ENIAC, the first general-purpose electronic digital computer. It then discusses the evolution of CPU and memory architecture from vacuum tubes to integrated circuits and microprocessors. The document outlines different bus architectures like ISA, EISA, MCA, PCI, and AGP that were used to connect components. It also reviews memory hierarchies and I/O interfaces like IDE, SCSI, serial ports, USB, and parallel ports. The presentation aims to trace the progression of computer hardware technology over time.
This document provides an introduction to a course on computer organization and assembly language. It will cover the main hardware components of a computer system, including memory, the CPU, and I/O ports. It will also discuss how instructions are executed in the fetch-execute cycle. Students will learn assembly language and how it maps to the underlying machine language understood by the CPU. They will be assessed through quizzes, assignments, a project, and a final exam.
This document discusses several digital coding systems including BCD, excess-3, EBCDIC, error detection codes, Unicode, ASCII, extended ASCII, and Gray code. It provides details on each code such as the number of bits used, the symbols represented, and how the codes are derived. For example, it explains that BCD represents each decimal digit with 4 bits and excess-3 code is obtained by adding 3 to the BCD number. It also covers topics like parity bits for error detection and the properties of Gray code.
This document discusses computer registers and their functions. It describes 8 key registers - Data Register, Address Register, Accumulator, Instruction Register, Program Counter, Temporary Register, Input Register and Output Register. It explains what each register stores and its role. For example, the Program Counter holds the address of the next instruction to be executed, while the Accumulator is used for general processing. The registers are connected via a common bus to transfer information between memory and registers for processing instructions.
1) The document discusses different types of micro-operations including arithmetic, logic, shift, and register transfer micro-operations.
2) It provides examples of common arithmetic operations like addition, subtraction, increment, and decrement. It also describes logic operations like AND, OR, XOR, and complement.
3) Shift micro-operations include logical shifts, circular shifts, and arithmetic shifts which affect the serial input differently.
This document discusses arithmetic operations for computers including addition, subtraction, and overflow. It provides examples of adding and subtracting numbers in binary format. It explains the basic rules for addition and subtraction of binary numbers. It also discusses overflow that can occur during arithmetic operations and how overflow is handled differently for signed versus unsigned integers in MIPS computers. Overflow is detected using exceptions in MIPS.
The document provides an introduction to assembly language programming. It explains that assembly language uses mnemonics to represent machine instructions, making programs more readable compared to machine code. An assembler is needed to translate assembly code into executable object code. Assembly language provides direct access to hardware and can be faster than high-level languages, though it is more difficult to program and maintain.
Here are the key steps in designing a pipelined processor:
1. Identify the stages in the instruction execution pipeline, such as fetch, decode, execute, memory, writeback.
2. Associate functional units and resources with each pipeline stage. For example, register file access in execute stage.
3. Examine the datapath and control signals to ensure data and resource dependencies flow correctly through the pipeline with no conflicts.
4. Add pipeline registers between stages to break up instruction flow into discrete packets and enable overlapped execution.
5. Design pipeline control logic to assert appropriate control signals in each stage, such as read/write enables for register file.
6. Handle exceptions like hazards properly with
The document discusses Unicode and file handling topics for an ABAP workshop. It covers characters and encoding, ASCII standards, glyphs and fonts, extended ASCII issues, character sets and code pages, little and big endian formats, Unicode, Unicode transformation formats, Unicode in SAP systems, file interfaces, and error handling for files on application and presentation servers. Unicode provides a unique number for every character to standardize representation across languages, platforms, and programs.
Computers represent both numeric and non-numeric characters using predefined codes. The ASCII code represents 128 characters using 7 bits, while ASCII-8 extends this to 256 characters using 8 bits. ISCII was developed for Indian languages and allows simultaneous use of English and Indian scripts using 8 bits per character. Unicode is now the universal standard adopted by all platforms that assigns a unique number to every character worldwide for interchange, processing and display of written texts across languages.
This document discusses different methods for representing data in computers, including numeric and character representations. It covers representing signed and unsigned integers using methods like sign-magnitude, 1's complement, and 2's complement. It also discusses floating point number representation using the IEEE standard. Finally, it discusses character representation using ASCII and Unicode encoding schemes.
George Boole published "An Investigation into the Laws of Thought" in 1854, outlining a system of logic and algebraic language dealing with true and false values. This became known as Boolean logic. Boolean logic uses only true and false values and the basic operations are AND, OR, and NOT. Boolean logic is the basis for modern computing, as electronic circuits can represent Boolean operations using gates. Circuits called AND, OR, and NOT gates perform the corresponding logical operations and form the building blocks for digital logic.
This document provides an introduction and outline for a course on Formal Language Theory. The course will cover topics like set theory, relations, mathematical induction, graphs and trees, strings and languages. It will then introduce formal grammars including regular grammars, context-free grammars and pushdown automata. The course is divided into 5 chapters: Basics, Introduction to Grammars, Regular Languages, Context-Free Languages, and Pushdown Automata. The Basics chapter provides an overview of formal vs natural languages and reviews concepts like sets, relations, functions, and mathematical induction.
Lexical analysis is the first phase of compilation. It reads source code characters and divides them into tokens by recognizing patterns using finite automata. It separates tokens, inserts them into a symbol table, and eliminates unnecessary characters. Tokens are passed to the parser along with line numbers for error handling. An input buffer is used to improve efficiency by reading source code in blocks into memory rather than character-by-character from secondary storage. Lexical analysis groups character sequences into lexemes, which are then classified as tokens based on patterns.
The Pentium processor introduced in 1993 features a superscalar architecture that allows multiple instructions to be executed simultaneously. It has separate 8KB instruction and data caches and a 64-bit data bus. The Pentium uses dynamic branch prediction and out-of-order execution to further improve performance through superscalar design.
An arithmetic logic unit (ALU) is a digital electronic circuit that performs arithmetic and bitwise logical operations on integer binary numbers.
This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units.
A single CPU, FPU or GPU may contain multiple ALUs
History Of ALU:Mathematician John von Neumann proposed the ALU concept in 1945 in a report on the foundations for a new computer called the EDVAC(Electronic Discrete Variable Automatic Computer
Typical Schematic Symbol of an ALU:A and B: the inputs to the ALU
R: Output or Result
F: Code or Instruction from the
Control Unit
D: Output status; it indicates cases
Circuit operation:An ALU is a combinational logic circuit
Its outputs will change asynchronously in response to input changes
The external circuitry connected to the ALU is responsible for ensuring the stability of ALU input signals throughout the operation
Theory of automata and formal languageRabia Khalid
The document discusses theory of automata and formal languages. It defines key concepts like abstract machines, automata, alphabets, strings, words, languages and provides examples to describe them. Abstract machines are theoretical models of computer systems used to analyze how they work. Automata are self-operating machines that follow predetermined sequences of operations. Alphabets are sets of symbols, strings are concatenations of symbols, and words are strings belonging to a language. Languages can be defined descriptively or recursively and examples are given to illustrate different ways of defining languages.
Types of instructions can be categorized into data transfer, arithmetic, and logical/program control instructions. Data transfer instructions like MOV copy data between registers and memory. Arithmetic instructions include INC/DEC to increment/decrement values, ADD/SUB for addition/subtraction, and MUL/DIV for multiplication/division. Logical instructions perform bitwise operations while program control instructions manage program flow.
This document provides an introduction to the theory of automata. It defines key concepts like alphabets, strings, words, and languages. It discusses different ways of defining languages through descriptive definitions. Important examples include the EVEN, ODD, EQUAL and PALINDROME languages. The document also proves that there are equal numbers of palindromes of length 2n and 2n-1. It introduces recursive definitions and regular expressions as additional ways to define languages formally.
The CPU acts as the computer's brain and carries out instructions from programs. It has two main components: the control unit, which selects and coordinates instruction execution, and the arithmetic logic unit, which performs calculations. Registers temporarily store data during instruction processing, including special purpose registers like the program counter, memory address, and accumulator registers. The CPU communicates with main memory, where files and applications are stored, and executes instructions through a multi-step process controlled by the control unit.
The document provides an overview of instruction sets, including:
1) Instruction formats contain operation codes, source/result operand references, and next instruction references. Operands can be located in memory, registers, or immediately within the instruction.
2) Types of operations include data transfer, arithmetic, logical, conversion, I/O, system control, and transfer of control.
3) Addressing modes specify how the target address is identified in the instruction, such as immediate, direct, indirect, register, register indirect, displacement, and stack addressing.
The main Objective of this presentation is to define computer buses , especially system bus . which is consists of data bus , address bus and control bus.
This document provides an overview of the history and development of computer architecture. It begins with some of the earliest computing devices like the abacus and ENIAC, the first general-purpose electronic digital computer. It then discusses the evolution of CPU and memory architecture from vacuum tubes to integrated circuits and microprocessors. The document outlines different bus architectures like ISA, EISA, MCA, PCI, and AGP that were used to connect components. It also reviews memory hierarchies and I/O interfaces like IDE, SCSI, serial ports, USB, and parallel ports. The presentation aims to trace the progression of computer hardware technology over time.
This document provides an introduction to a course on computer organization and assembly language. It will cover the main hardware components of a computer system, including memory, the CPU, and I/O ports. It will also discuss how instructions are executed in the fetch-execute cycle. Students will learn assembly language and how it maps to the underlying machine language understood by the CPU. They will be assessed through quizzes, assignments, a project, and a final exam.
This document discusses several digital coding systems including BCD, excess-3, EBCDIC, error detection codes, Unicode, ASCII, extended ASCII, and Gray code. It provides details on each code such as the number of bits used, the symbols represented, and how the codes are derived. For example, it explains that BCD represents each decimal digit with 4 bits and excess-3 code is obtained by adding 3 to the BCD number. It also covers topics like parity bits for error detection and the properties of Gray code.
This document discusses computer registers and their functions. It describes 8 key registers - Data Register, Address Register, Accumulator, Instruction Register, Program Counter, Temporary Register, Input Register and Output Register. It explains what each register stores and its role. For example, the Program Counter holds the address of the next instruction to be executed, while the Accumulator is used for general processing. The registers are connected via a common bus to transfer information between memory and registers for processing instructions.
1) The document discusses different types of micro-operations including arithmetic, logic, shift, and register transfer micro-operations.
2) It provides examples of common arithmetic operations like addition, subtraction, increment, and decrement. It also describes logic operations like AND, OR, XOR, and complement.
3) Shift micro-operations include logical shifts, circular shifts, and arithmetic shifts which affect the serial input differently.
This document discusses arithmetic operations for computers including addition, subtraction, and overflow. It provides examples of adding and subtracting numbers in binary format. It explains the basic rules for addition and subtraction of binary numbers. It also discusses overflow that can occur during arithmetic operations and how overflow is handled differently for signed versus unsigned integers in MIPS computers. Overflow is detected using exceptions in MIPS.
The document provides an introduction to assembly language programming. It explains that assembly language uses mnemonics to represent machine instructions, making programs more readable compared to machine code. An assembler is needed to translate assembly code into executable object code. Assembly language provides direct access to hardware and can be faster than high-level languages, though it is more difficult to program and maintain.
Here are the key steps in designing a pipelined processor:
1. Identify the stages in the instruction execution pipeline, such as fetch, decode, execute, memory, writeback.
2. Associate functional units and resources with each pipeline stage. For example, register file access in execute stage.
3. Examine the datapath and control signals to ensure data and resource dependencies flow correctly through the pipeline with no conflicts.
4. Add pipeline registers between stages to break up instruction flow into discrete packets and enable overlapped execution.
5. Design pipeline control logic to assert appropriate control signals in each stage, such as read/write enables for register file.
6. Handle exceptions like hazards properly with
The document discusses Unicode and file handling topics for an ABAP workshop. It covers characters and encoding, ASCII standards, glyphs and fonts, extended ASCII issues, character sets and code pages, little and big endian formats, Unicode, Unicode transformation formats, Unicode in SAP systems, file interfaces, and error handling for files on application and presentation servers. Unicode provides a unique number for every character to standardize representation across languages, platforms, and programs.
Computers represent both numeric and non-numeric characters using predefined codes. The ASCII code represents 128 characters using 7 bits, while ASCII-8 extends this to 256 characters using 8 bits. ISCII was developed for Indian languages and allows simultaneous use of English and Indian scripts using 8 bits per character. Unicode is now the universal standard adopted by all platforms that assigns a unique number to every character worldwide for interchange, processing and display of written texts across languages.
The document discusses different character sets used in computing. It describes the ASCII character set which uses 128 characters and numbers to represent English letters, numbers and symbols. It also discusses the extended character set which includes 255 characters like symbols and international letters. Finally, it introduces Unicode which began in 1989 and aims to support encoding for all languages and alphabets in the world using up to 65,000 characters, grouping related symbols into scripts to serve multiple languages.
This document discusses Unicode transformation formats. It explains that computers assign numbers to characters and that older 8-bit encoding systems were limited, causing conflicts when different encodings were used. Unicode provides a unique number for every character to allow for worldwide text interchange. It describes common encoding schemes like UTF-8, UTF-16 and UTF-32 that are used to encode Unicode, along with their characteristics and benefits. The document also lists some examples of where Unicode is used.
ASCII (American Standard Code for Information Interchange) is a 7-bit character encoding scheme where each character is assigned a number from 0-127. It was developed in 1963 to provide a standard for coding characters like letters, numbers, and symbols. Computers use ASCII to represent text characters numerically so they can be stored and processed using binary numbers.
Computer programmers developed coding systems to represent letters, numbers, and symbols with numeric codes. Three popular coding systems are EBCDIC, ASCII, and Unicode. EBCDIC used 6-bit codes and could represent 64 symbols, while ASCII is now most common and uses 8-bit codes for 256 symbols. Unicode is an developing standard that uses two bytes and 16 bits to represent each of its 65,536 symbols, allowing it to include symbols from languages around the world.
This document discusses how text is stored on computers. It explains that each character is assigned a unique binary code value known as ASCII (American Standard Code for Information Interchange). ASCII used 7-bit codes to represent 128 common English characters, while Extended ASCII expanded to 8 bits to include additional characters. It also describes control characters as non-printable ASCII codes that perform functions like backspace. Finally, it defines a character set as the full repertoire of symbols a computer system can represent for a given language.
Character sets and collations are am important part of the database setup. In this presentation I show you the history of character sets and how they are used today, how UTF-8 works and how MySQL handles all this.
Unicode provides a standard way to encode characters from all languages. This introduced the problem of how to represent these characters in memory and storage. Several encoding forms were developed, including UTF-8, UTF-16, and UTF-32, each with their own advantages and disadvantages. UTF-8 became popular as it is backwards compatible with ASCII and uses variable length encoding for efficient storage. Notepad and browsers can determine the encoding of a file or page through a Byte Order Mark or HTTP header respectively. In practice, UTF-8 is commonly recommended due to its efficiency and compatibility.
The ASCII system standardizes text files by assigning each character a unique number that can be converted to a binary pattern, ensuring compatibility across computer systems. It uses 7 bits, allowing for 128 characters including 32 control characters. Extended ASCII expands this to 8 bits for 256 characters. Unicode supersedes these systems with 16 bits supporting over 65,000 characters, including those needed for languages like Japanese. While Unicode supports many scripts, its files are larger since each character requires 2 bytes of storage.
The ASCII code used by most computers uses the last seven positions .pdfFashionBoutiquedelhi
The ASCII code used by most computers uses the last seven positions of an eight-bit byte to
represent all the characters on a standard keyboard. how many different orderings of 0\'s and 1\'s
(or how many different characters) can be made by using the last seven positions of an eight-bit
byte?
Solution
There are 256 possible values (or characters) in 8 bits.
If you\'re somewhat familiar with computers, then you know that all modern computers are
\"digital\", i.e. internally they represent all data as numbers. In the very early days of computing
(1940\'s), it became clear that computers could be used for more than just number crunching.
They could be used to store and manipulate text. This could be done by simply representing
different alphabetic letters by specific numbers. For example, the number 65 to represent the
letter \"A\", 66 to represent \"B\", and so on. At first, there was no standard, and different ways
of representing text as numbers developed, e.g. EBCDIC (ref. 2).
By the late 1950\'s computers were getting more common, and starting to communicate with
each other. There was a pressing need for a standard way to represent text so it could be
understood by different models and brands of computers. This was the impetus for the
development of the ASCII table, first published in 1963 but based on earlier similar tables used
by teleprinters. After several revisions, the modern version of the 7-bit ASCII table was adopted
as a standard by the American National Standards Institute (ANSI) during the 1960\'s. The
current version is from 1986, published as ANSI X3.4-1986 (ref. 1). ACSII expands to
\"American Standard Code for Information Interchange\".
If you\'ve read this far then you probably know that around then (1960\'s), an 8-bit byte was
becoming the standard way that computer hardware was built, and that you can store 128
different numbers in a 7-bit number. When you counted all possible alphanumeric characters (A
to Z, lower and upper case, numeric digits 0 to 9, special characters like \"% * / ?\" etc.) you
ended up a value of 90-something. It was therefore decided to use 7 bits to store the new ASCII
code, with the eighth bit being used as a parity bit to detect transmission errors.
Over time, this table had limitations which were overcome in different ways. First, there were
\"extended\" or \"8-bit\" variations to accomodate European languages primarily, or
mathematical symbols. These are not \"standards\", but used by different computers, languages,
manufacturers, printers at different times. Thus there are many variations of the 8-bit or extended
\"ascii table\". None of them is reproduced here, but you can read about them in the references
below (ref. 5).
By the 1990\'s there was a need to include non-English languages, including those that used
other alphabets, e.g. Chinese, Hindi, Persian etc. The UNICODE representation uses 16 bits to
store each alphanumeric character, which allows for many tens of thousands of different
c.
This document discusses character sets like ASCII and Unicode. ASCII maps English letters, numbers, and symbols to 7-bit binary codes and was the original standard, while Unicode is now more widely used as it supports over 110,000 characters from writing systems around the world, including ASCII as a subset for compatibility. An example at the end shows converting decimal values into ASCII text using an ASCII conversion table.
Unicode is an alternative character encoding standard to ASCII that can represent many more characters and languages. It was originally a 16-bit encoding that could represent around 7,000 characters, but now uses 8, 16, or 32 bits per character, allowing it to encode over 137,000 characters in the current version. While Unicode supports more languages by encoding more symbols, it also uses more computer memory than ASCII to store each character.
This document discusses character encodings and provides tips for properly handling encodings in programming. It begins with definitions of characters, scripts, and the need for character sets. It then discusses commonly used character sets like ASCII and Unicode. UTF-8, UTF-16, and UTF-32 encodings are explained as they allow representing all Unicode characters using variable number of bytes. The document concludes with programming language-specific tips and functions for detecting, parsing, and writing encodings in languages like PHP, Java, Objective-C, and C#.
Xml For Dummies Chapter 6 Adding Character(S) To Xmlphanleson
This document provides an overview of character encodings and how they are handled in XML. It discusses the limitations of 7-bit and 8-bit character encodings and how Unicode addresses these by supporting a much wider range of characters with 16-bit encoding. It also describes how characters maps to numeric codes in Unicode/ISO 10646 and how UTF encodings implement Unicode. Additional topics covered include common character sets, using Unicode characters, and resources for finding character entity information.
Unicode - Hacking The International Character SystemWebsecurify
In this presentation we explore some of the problems of unicode and how they can be used for nefarious purposes in order to exploit a range of critical vulnerabilities including SQL Injection, XSS and many other.
Data encryption and tokenization for international unicodeUlf Mattsson
Unicode is an information technology standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems. The standard is maintained by the Unicode Consortium, and as of March 2020, it has a total of 143,859 characters, with Unicode 13.0 (these characters consist of 143,696 graphic characters and 163 format characters) covering 154 modern and historic scripts, as well as multiple symbol sets and emoji. The character repertoire of the Unicode Standard is synchronized with ISO/IEC 10646, each being code-for-code identical with the other.
The Unicode Standard consists of a set of code charts for visual reference, an encoding method and set of standard character encodings, a set of reference data files, and a number of related items, such as character properties, rules for normalization, decomposition, collation, rendering, and bidirectional text display order (for the correct display of text containing both right-to-left scripts, such as Arabic and Hebrew, and left-to-right scripts). Unicode's success at unifying character sets has led to its widespread and predominant use in the internationalization and localization of computer software. The standard has been implemented in many recent technologies, including modern operating systems, XML, Java (and other programming languages), and the .NET Framework.
Unicode can be implemented by different character encodings. The Unicode standard defines Unicode Transformation Formats (UTF) UTF-8, UTF-16, and UTF-32, and several other encodings. The most commonly used encodings are UTF-8, UTF-16, and UCS-2 (a precursor of UTF-16 without full support for Unicode)
My talks at Voxxed Days Zurich 2016. This is about he history of character encodings and unicode. And it's all about APIs stuck in the 90ies where things were very different.
Computers use binary digits (0s and 1s) to represent all data as these are the only two states that electronics can interpret. Characters are encoded using patterns of bits and bytes, with ASCII and Unicode being the most common encoding schemes to represent a wide range of languages. For a character to be displayed, it is converted through various stages from a keyboard press to a binary code to the appropriate character on screen.
Computers use binary digits (0s and 1s) to represent all data as these are the only two states that electronics can recognize. Characters are represented by patterns of bits (the smallest unit of data) that are grouped into bytes. Initially, the ASCII coding scheme was used to represent English and Western European languages using 7-bit bytes, but Unicode superseded it using 16-bit bytes and supports over 65,000 characters for many languages. When typing on a keyboard, keys are converted to electronic signals then binary codes which are processed and converted back to recognizable characters on a screen.
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4. Outline
• ASCII Code
• Unicode system
– Discuss the Unicode’s main objective within
computer processing
• Computer processing before development of
Unicode
• Unicode vs. ASCII
• Different kinds of Unicode encodings
• Significance of Unicode in the modern world
5. From Bit & Bytes to ASCII
• Bytes can represent any
collection of items using a
“look-up table” approach
• ASCII is used to represent
characters
ASCII
American Standard Code for Information
Interchange
http://en.wikipedia.org/wiki/ASCII
6. ASCII
• It is an acronym for the American Standard Code for
Information Interchange.
• It is a standard seven-bit code that was first
proposed by the American National Standards
Institute or ANSI in 1963, and finalized in 1968 as
ANSI Standard X3.4.
• The purpose of ASCII was to provide a standard to
code various symbols ( visible and invisible symbols)
7. ASCII
• In the ASCII character set, each binary value
between 0 and 127 represents a specific
character.
• Most computers extend the ASCII character
set to use the full range of 256 characters
available in a byte. The upper 128 characters
handle special things like accented characters
from common foreign languages.
8. • In general, ASCII works by assigning standard
numeric values to letters, numbers,
punctuation marks and other characters such
as control codes.
• An uppercase "A," for example, is represented
by the decimal number 65."
9. Bytes: ASCII
• By looking at the ASCII table, you can clearly see a
one-to-one correspondence between each character
and the ASCII code used.
• For example, 32 is the ASCII code for a space.
• We could expand these decimal numbers out to
binary numbers (so 32 = 00100000), if we wanted to
be technically correct -- that is how the computer
really deals with things.
10. Bytes: ASCII
• Computers store text documents, both on disk and in
memory, using these ASCII codes.
• For example, if you use Notepad in Windows XP/2000 to
create a text file containing the words, "Four score and seven
years ago," Notepad would use 1 byte of memory per
character (including 1 byte for each space character between
the words -- ASCII character 32).
• When Notepad stores the sentence in a file on disk, the file
will also contain 1 byte per character and per space.
• Binary number is usually displayed as Hexadecimal to save
display space.
11. • Take a look at a file size now.
• Take a look at the space of your p drive
12. Bytes: ASCII
• If you were to look at the file as a computer
looks at it, you would find that each byte
contains not a letter but a number -- the
number is the ASCII code corresponding to the
character (see below). So on disk, the numbers
for the file look like this:
• F o u r a n d s e v e n
• 70 111 117 114 32 97 110 100 32 115 101 118
101 110
13. • Externally, it appears that human beings will use
natural languages symbols to communicate with
computer.
• But internally, computer will convert everything into
binary data.
• Then process all information in binary world.
• Finally, computer will convert binary information to
human understandable languages.
14. • When you type the letter A, the hardware
logic built into the keyboard automatically
translates that character into the ASCII code
65, which is then sent to the computer.
Similarly, when the computer sends the ASCII
code 65 to the screen, the letter A appears.
15. ascii
ASCII stands for American Standard Code for
Information Interchange
First published on October 6, 1960
ASCII is a type of binary data
16. Ascii part 2
ASCII is a character encoding scheme that
encodes 128 different characters into 7 bit
integers
Computers can only read numbers, so ASCII is
a numerical representation of special
characters
Ex: ‘%’ ‘!’ ‘?’
17. Ascii part 3
ASCII code assigns a number
for each English character
Each letter is assigned a
number from 0-127
Ex: An uppercase ‘m’ has
the ASCII code of 77
By 2007, ASCII was the most
commonly used character
encoding program on the
internet
19. Large files
Large files can contain several megabytes
1,000,000 bytes are equivalent to one megabyte
Some applications on a computer may even
take up several thousand megabytes of data
20. revisit “char” data type
• In C, single characters are represented using
the data type char, which is one of the most
important scalar data types.
char achar;
achar=‘A’;
achar=65;
21. Character and integer
• A character and an integer (actually a small
integer spanning only 8 bits) are actually
indistinguishable on their own. If you want to
use it as a char, it will be a char, if you want to
use it as an integer, it will be an integer, as
long as you know how to use proper C++
statements to express your intentions.
23. What is Unicode?
• A worldwide character-encoding standard
• Its main objective is to enable a single,
unique character set that is capable of
supporting all characters from all scripts, as
well as symbols, that are commonly utilized
for computer processing throughout the
globe
• Fun fact: Unicode is capable of encoding
about at least 1,110,000 characters!
24. Before Unicode Began…
• During the 1960s, each letter or character was
represented by a number assigned from multiple
different encoding schemes used by the ASCII Code
• Such schemes included code pages that held as many
as 256 characters, with each character requiring about
eight bits of storage!
• Made it insufficient to manage character sets consisting
of thousands of characters such as Chinese and
Japanese characters
• Basically, character encoding was very limited in
how much it was capable of containing
• Also did not enable character sets of various languages
to integrate
25. The ASCII Code
• Acronym for the American Standard Code for Information
Interchange
• A computer processing code that represents English characters as
numbers, with each letter assigned a number from 0 to 127
– For instance, the ASCII code for uppercase M is 77
• The standard ASCII character set uses just 7 bits for each character
• Some larger character sets in ASCII code incorporate 8 bits, which
allow 128 additional characters used to represent non-English
characters, graphics symbols, and mathematical symbols
• ASCII vs Unicode
26. This depicts how Unicode is capable of
encoding characters from virtually
every kind of language
This indicates how
different characters
are organized into
representing a
unique character
set
This shows
how Unicode
can manipulate
the style and
size of each
character
This compares
what ASCII
and Unicode
are able to
encode
27. Various Unicode Encodings
Name UTF-8 UTF-16 UTF-16BE UTF-16LE UTF-32 UTF-32BE UTF-32LE
Smallest
code
point
0000 0000 0000 0000 0000 0000 0000
Largest
code
point
10FFFF 10FFFF 10FFFF 10FFFF 10FFFF 10FFFF 10FFFF
Code unit
size
8 bits 16 bits 16 bits 16 bits 32 bits 32 bits 32 bits
Byte
order
N/A <BOM>
big-
endian
little-
endian
<BOM>
big-
endian
little-
endian
Fewest
bytes per
character
1 2 2 2 4 4 4
Most
bytes per
character
4 4 4 4 4 4 4
http://www.unicode.org/faq/utf_bom.html
29. ASCII vs Unicode
-Has 128 code
points, 0 through
127
-Can only encode
characters in 7 bits
-Can only encode
characters from
the English
language
-Has about
1,114,112 code
positions
-Can encode
characters in 16-
bits and more
-Can encode
characters from
virtually all kinds of
languages
-It is a superset of
ASCII
-Both
are
charact
er
codes
-The
128 first
code
position
s of
Unicod
e mean
the
same
as
ASCII
30. Method of Encoding
• Unicode Transformation Format (UTF)
– An algorithmic mapping from virtually every Unicode code point to
a unique byte sequence
– Each UTF is reversible, thus every UTF supports lossless round
tripping: mapping from any Unicode coded character sequence S to
a sequence of bytes and back will produce S again
– Most texts in documents and webpages is encoded using some of
the various UTF encodings
– The conversions between all UTF encodings are algorithmically
based, fast and lossless
• Makes it easy to support data input or output in multiple formats,
while using a particular UTF for internal storage or processing
31. Unicode Transformation
Format Encodings
• UTF-7
– Uses 7 bits for each character. It was designed to represent ASCII
characters in email messages that required Unicode encoding
– Not really used as often
• UTF-8
– The most popular type of Unicode encoding
– It uses one byte for standard English letters and symbols, two bytes
for additional Latin and Middle Eastern characters, and three bytes for
Asian characters
– Any additional characters can be represented using four bytes
– UTF-8 is backwards compatible with ASCII, since the first 128
characters are mapped to the same values
32. UTF Encodings (Cont…)
• UTF-16
– An extension of the "UCS-2" Unicode encoding, which uses at least two
bytes to represent about 65,536 characters
– Used by operating systems such as Java and Qualcomm BREW
• UTF-32
– A multi-byte encoding that represents each character with 4 bytes
• Makes it space inefficient
– Main use is in internal APIs where the data is single code points or glyphs,
rather than strings of characters
– Used on Unix systems sometimes for storage of information
33. What
can
Unicod
e be
Used
For?
Encode text for creation of
passwords
Encode characters used in
email settings
Encodes characters to display in all webpages
Modify characters used
in documents
34. Why is Unicode Important?
• By providing a unique set for each character, this systemized standard
creates a simple, yet efficient and faster way of handling tasks involving
computer processing
• Makes it possible for a single software product or a single website to be
designed for multiple countries, platforms, and languages
– Can reduce the cost over using legacy character sets
– No need for re-engineering!
• Unicode data can be utilized through a wide range of systems without the
risk of data corruption
• Unicode serves as a common point in the conversion of between other
character encoding schemes
– It is a superset of all of the other common character encoding schemes
• Therefore, it is possible to convert from one encoding scheme to
Unicode, and then from Unicode to the other encoding scheme.
35. Unicode in the Future…
• Unicode may be capable of encoding characters from
every language across the globe
• Can become the most dominant and resourceful tool in
encoding every kind of character and symbol
• Integrates all kinds of character encoding schemes into
its operations
36. Summary
Unicode’s ability to create a standard in which virtually
every character is represented through its complicated
operations has revolutionized the way computer processing is
handled today. It has emerged as an effective tool for processing
characters within computers, replacing old versions of character
encodings, such as the ASCII. Unicode’s capacity has
substantially grown since its development, and continues to
expand on its capability of encoding all kinds of characters and
symbols from every language across the globe. It will become a
necessary component of the technological advances that we will
inevitably continue to produce in the near future, potentially
creating new ways of encoding characters.
37. Pop Quiz!
1. What is the main purpose of the Unicode system?
-To enable a single, unique character set that is
capable of supporting all characters from all scripts and
symbols
2. How many code points is Unicode capable of
encoding?
-About 1,114,112 code points