Digraphs and Trigraphs

Digraphs and Trigraphs

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, digraphs and trigraphs are sequences of two and three characters respectively, appearing in source code, which a programming language specification requires an implementation of that language to treat as-if they were one other character. 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 { and }. The basic character set of the C programming language is a superset 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 keyboard being used does not support any of these nine characters. The ANSI C committee invented trigraphs as a way of entering source code using keyboards that support any version of the ISO 646 character set.show more

Product details

  • Paperback | 92 pages
  • 152 x 229 x 6mm | 145g
  • Anim Publishing
  • United States
  • English
  • 6136581221
  • 9786136581224