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Trigraph (C )
{{Disambiguation ...
Trigraph may refer to: Computing * Digraphs and trigraphs, a group of characters used to symbolise one character *An octal or decimal representation of byte values *Mnemonics for machine language instructions *As language codes in ISO 639 Cryptography *As substitution group in a substitution cipher *As combinations in the Ling Qi Jing Mathematics *As a generalization of graphs where there is a set of edges called ''semi-adjacent'' Other uses * Trigraph (orthography), a sound representation in orthography See also * Digraph (other) * Tetragraph *Multigraph (other) A multigraph is a mathematical graph where some pairs of vertices are connected by more than one edge. Multigraph may also refer to: * Multigraph (orthography), a sequence of letters that behaves as a unit and is not the sum of its parts * Mul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digraphs And Trigraphs
In computer programming, digraphs and trigraphs are sequences of two and three characters, respectively, that appear in source code and, according to a programming language's specification, should be treated as if they were single characters. Various reasons exist for using digraphs and trigraphs: keyboards may not have keys to cover the entire character set of the language, input of special characters may be difficult, text editors may reserve some characters for special use and so on. Trigraphs might also be used for some EBCDIC code pages that lack characters such as . History The basic character set of the C programming language is a subset of the ASCII character set that includes nine characters which lie outside the ISO 646 invariant character set. This can pose a problem for writing source code when the encoding (and possibly keyboard) being used does not support any of these nine characters. The ANSI C committee invented trigraphs as a way of entering source code usi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Byte
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures. To disambiguate arbitrarily sized bytes from the common 8-bit definition, network protocol documents such as The Internet Protocol () refer to an 8-bit byte as an octet. Those bits in an octet are usually counted with numbering from 0 to 7 or 7 to 0 depending on the bit endianness. The first bit is number 0, making the eighth bit number 7. The size of the byte has historically been hardware-dependent and no definitive standards existed that mandated the size. Sizes from 1 to 48 bits have been used. The six-bit character code was an often-used implementation in early encoding systems, and computers using six-bit and nine-bit bytes were common in the 1960s. These systems often had memory words ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machine Language
In computer programming, machine code is any low-level programming language, consisting of machine language instructions, which are used to control a computer's central processing unit (CPU). Each instruction causes the CPU to perform a very specific task, such as a load, a store, a jump, or an arithmetic logic unit (ALU) operation on one or more units of data in the CPU's registers or memory. Early CPUs had specific machine code that might break backwards compatibility with each new CPU released. The notion of an instruction set architecture (ISA) defines and specifies the behavior and encoding in memory of the instruction set of the system, without specifying its exact implementation. This acts as an abstraction layer, enabling compatibility within the same family of CPUs, so that machine code written or generated according to the ISA for the family will run on all CPUs in the family, including future CPUs. In general, each architecture family (e.g. x86, ARM) has its own I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ISO 639
ISO 639 is a set of standards by the International Organization for Standardization that is concerned with representation of names for languages and language groups. It was also the name of the original standard, approved in 1967 (as ''ISO 639/R'') and withdrawn in 2002. The ISO 639 set now consists of five parts, since part 6 was withdrawn. Use of ISO 639 codes The language codes defined in the several sections of ISO 639 are used for bibliographic purposes and, in computing and internet environments, as a key element of locale data. The codes also find use in various applications, such as Wikipedia URLs for its different language editions. Current and historical parts of the standard Each part of the standard is maintained by a maintenance agency, which adds codes and changes the status of codes when needed. ISO 639-6 was withdrawn in 2014. Characteristics of individual codes Scopes: * Individual languages * Macrolanguages (Part 3) * Collections of languages (Parts 1, 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substitution Cipher
In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing the inverse substitution process to extract the original message. Substitution ciphers can be compared with transposition ciphers. In a transposition cipher, the units of the plaintext are rearranged in a different and usually quite complex order, but the units themselves are left unchanged. By contrast, in a substitution cipher, the units of the plaintext are retained in the same sequence in the ciphertext, but the units themselves are altered. There are a number of different types of substitution cipher. If the cipher operates on single letters, it is termed a simple substitution cipher; a cipher that operates on larger groups of letters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ling Qi Jing
''Lingqijing'' (or ''Ling Ch'i Ching''; 靈棋經 lit. "Classic of the Divine Chess") is a Chinese book of divination. It is not known when, nor by whom, it was written, though legend has it that the strategist Zhang Liang got it from Huang Shigong (黃石公), a semi-mythological figure in Chinese history. The first commented edition of the work appeared in the Jin Dynasty. As its name suggests, the work concerns "divining" with tokens, such as Chinese chess (''xiangqi'' i.e.象棋) pieces (instead of with the more traditional turtle shells or yarrow stalks used in ''I Ching'' divination). Twelve Xiangqi pieces are used; each piece is a disc with a character on one side, and the other side unmarked. Four have the character for "up" (, pronounced ''shang''), four have the character for "middle" (, ''zhong''), and four have the character for "down" (, ''xia''), representing respectively the Three Realms: Heaven (, ''tian''), Humanity (, ''ren''), and Earth (, ''di''). These ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graph (discrete Mathematics)
In discrete mathematics, and more specifically in graph theory, a graph is a structure amounting to a Set (mathematics), set of objects in which some pairs of the objects are in some sense "related". The objects correspond to mathematical abstractions called ''Vertex (graph theory), vertices'' (also called ''nodes'' or ''points'') and each of the related pairs of vertices is called an ''edge'' (also called ''link'' or ''line''). Typically, a graph is depicted in diagrammatic form as a set of dots or circles for the vertices, joined by lines or curves for the edges. Graphs are one of the objects of study in discrete mathematics. The edges may be directed or undirected. For example, if the vertices represent people at a party, and there is an edge between two people if they shake hands, then this graph is undirected because any person ''A'' can shake hands with a person ''B'' only if ''B'' also shakes hands with ''A''. In contrast, if an edge from a person ''A'' to a person ''B'' m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trigraph (orthography)
A trigraph (from the el, τρεῖς, ''treîs'', "three" and γράφω, ''gráphō'', "write") is a group of three characters used to represent a single sound or a combination of sounds that does not correspond to the written letters combined. Latin-script trigraphs For example, in the word ''schilling'', the trigraph ''sch'' represents the voiceless postalveolar fricative , rather than the consonant cluster . In the word ''beautiful,'' the sequence ''eau'' is pronounced , and in the French word ''château'' it is pronounced . It is sometimes difficult to determine whether a sequence of letters in English is a trigraph, because of the complicating role of silent letters. There are however a few productive trigraphs in English such as ''tch'' as in ''watch,'' and ''igh'' as in ''high.'' The trigraph ''sch'' in German is equivalent to the English ''sh'' and pronounced . In Dutch, which is closely related to German, this same trigraph is pronounced . In Italian, however, ''sch'' r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digraph (other)
Digraph may refer to: * (typography) Digraph (orthography), a pair of characters used together to represent a single sound, such as "sh" in English * (Unicode) orthographic ligature, the joining of two letters as a single glyph, such as "æ"; considered a misnomer * Digraph (computing), a group of characters used in computer programming to symbolise one character * A directed graph, in graph theory * Digraph, component of a CIA cryptonym, a covert code name * As language codes in ISO 639-1 * Diagraph, a combination of a protractor and a scale ruler See also * Digraphia, use of multiple complete writing systems for one language. * Digram (other) / Digramme * Bigram A bigram or digram is a sequence of two adjacent elements from a string of tokens, which are typically letters, syllables, or words. A bigram is an ''n''-gram for ''n''=2. The frequency distribution of every bigram in a string is commonly used f ... * Trigraph (other) * Multigraph (other) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetragraph
A tetragraph (from the el, τετρα-, ''tetra-'', "four" and γράφω, ''gráphō'', "write") is a sequence of four letters used to represent a single sound (phoneme), or a combination of sounds, that do not necessarily correspond to the individual values of the letters. In German, for example, the tetragraph ''tsch'' represents the sound of the English digraph ''ch''. English does not have tetragraphs in native words (the closest is perhaps the sequence '' -ough'' in words like ''through''), but ''chth'' is a true tetragraph when found initially in words of Greek origin such as ''chthonian.'' Phonemes spelled with multiple characters often indicate that either the phoneme or the script is alien to the language. For example, the Cyrillic alphabets adapted to the Caucasian languages, which are phonologically very different from Russian, make extensive use of digraphs, trigraphs, and even a tetragraph in Kabardian ''кхъу'' for . The Romanized Popular Alphabet created for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
