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The C Programming Language (sometimes termed K&R, after its authors' initials) is a computer programmingbook written by Brian Kernighan and Dennis Ritchie, the latter of whom originally designed and implemented the language, as well as co-designed the Unixoperating system with which development of the language was closely intertwined. The book was central to the development and popularization of the C programming language and is still widely read and used today. Because the book was co-authored by the original language designer, and because the first edition of the book served for many years as the de facto standard for the language, the book was regarded by many to be the authoritative reference on C.^[1][2]

History[edit]

This cheat sheet sums up the basics of C#, for experienced developers who are learning C# and users who already know programming basics, hopefully this document has helped you in some way, there was not much information or explaining but then again I’m assuming you’ve. 2 Since 1 mol electrons = 6.022 140 76 × 10 23 electrons ( Avogadro's number ), 3 the Faraday constant is equal to the elementary charge e, the magnitude of the charge of an electron, multiplied by 1 mole: 4.

C was created by Dennis Ritchie at Bell Labs in the early 1970s as an augmented version of Ken Thompson's B.^[3]Another Bell Labs employee, Brian Kernighan, had written the first C tutorial,^[4]and he persuaded Ritchie to coauthor a book on the language.^[5]Kernighan would write most of the book's 'expository' material, and Ritchie's reference manual became its appendices.

The first edition, published February 22, 1978, was the first widely available book on the C programming language. Its version of C is sometimes termed K&R C (after the book's authors), often to distinguish this early version from the later version of C standardized as ANSI C.^[6]

In April 1988, the second edition of the book was published, updated to cover the changes to the language resulting from the then-new ANSI C standard, particularly with the inclusion of reference material on standard libraries. The second edition of the book (and as of 2018, the most recent) has since been translated into over 20 languages. In 2012, an eBook version of the second edition was published in ePub, Mobi, and PDF formats.

ANSI C, first standardized in 1989 (as ANSI X3.159-1989), has since undergone several revisions, the most recent of which is ISO/IEC 9899:2018 (also termed C17 or C18), adopted as an ANSI standard in June 2018. However, no new edition of The C Programming Language has been issued to cover the more recent standards.

Reception[edit]

Byte magazine stated in August 1983, '[The C Programming Language] is the definitive work on the C language. Don't read any further until you have this book!'^[1]Jerry Pournelle wrote in the magazine that year that the book 'is still the standard ... a bit terse'. He continued, 'You can learn the C language without getting Kernighan and Ritchie, but that's doing it the hard way. You're also working too hard if you make it the only book on C that you buy.'^[7]

Influence[edit]

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The C Programming Language has often been cited as a model for technical writing, with reviewers describing it as having clear presentation and concise treatment. Examples generally consist of complete programs of the type one is likely to encounter in daily use of the language, with an emphasis on system programming. Its authors said:

We have tried to retain the brevity of the first edition. C is not a big language, and it is not well served by a big book. We have improved the exposition of critical features, such as pointers, that are central to C programming. We have refined the original examples, and have added new examples in several chapters. For instance, the treatment of complicated declarations is augmented by programs that convert declarations into words and vice versa. As before, all examples have been tested directly from the text, which is in machine-readable form.

The book introduced the 'Hello, World!' program, which prints only the text 'hello, world', as an illustration of a minimal working C program. Since then, many texts have followed that convention for introducing a programming language.

Before the advent of ANSI C, the first edition of the text served as the de facto standard of the language for writers of C compilers. With the standardization of ANSI C, the authors more consciously wrote the second edition for programmers rather than compiler writers, saying:

Appendix A, the reference manual, is not the standard, but our attempt to convey the essentials of the standard in a smaller space. It is meant for easy comprehension by programmers, but not as a definition for compiler writers—that role properly belongs to the standard itself. Appendix B is a summary of the facilities of the standard library. It too is meant for reference by programmers, not implementers. Appendix C is a concise summary of the changes from the original version.

The influence of The C Programming Language on programmers, a generation of whom first worked with C in universities and industry, has led many to accept the authors' programming style and conventions as recommended practice, if not normative practice. For example, the coding and formatting style of the programs presented in both editions of the book is often referred to as 'K&R style' or the 'One True Brace Style' and became the coding style used by convention in the source code for the Unix and Linuxkernels.

See also[edit]

References[edit]

1. ^ ^abWard, Terry A. (August 1983). 'Annotated C / A Bibliography of the C Language'. Byte. p. 268. Retrieved 31 January 2015.
2. ^Prinz, Peter; Crawford, Tony (2005-12-16). C in a Nutshell. O'Reilly Media, Inc. p. 3. ISBN9780596550714.
3. ^Ritchie, Dennis M. (1993). 'The Development of the C Language'. History of Programming Languages, 2nd Edition. Retrieved 2018-11-11.
4. ^'Leap In and Try Things: Interview with Brian Kernighan'. Harmony at Work. October 24, 2009. Archived from the original on July 23, 2012. Retrieved 2013-03-03.
5. ^Computerphile (2015-08-18). ''C' Programming Language: Brian Kernighan - Computerphile'. Retrieved 2018-11-11.
6. ^Kernighan, Brian W.; Ritchie, Dennis M. (February 1978). The C Programming Language (1st ed.). Englewood Cliffs, NJ: Prentice Hall. ISBN0-13-110163-3.
7. ^Pournelle, Jerry (December 1983). 'The User Looks at Books'. Byte. p. 519. Retrieved 24 July 2016.
8. ^ ^abKernighan, Brian; Ritchie, Dennis M. (March 1988). The C Programming Language (2nd ed.). Englewood Cliffs, NJ: Prentice Hall. ISBN0-13-110362-8.

External links[edit]

• The C Programming Language, first edition available at the Internet Archive
• 'C Programming'. Bell Labs Computing Sciences Research Center. 2004-06-13. Archived from the original on 2017-02-21. Retrieved 17 January 2017.. Another archived page: 'The C Programming Language'. 2016-02-04.

Escape sequences are used in the programming languages C and C++, and their design was copied in many other languages such as Java, PHP, C#, etc. An escape sequence is a sequence of characters that does not represent itself when used inside a character or string literal, but is translated into another character or a sequence of characters that may be difficult or impossible to represent directly.

In C, all escape sequences consist of two or more characters, the first of which is the backslash, (called the 'Escape character'); the remaining characters determine the interpretation of the escape sequence. For example, n is an escape sequence that denotes a newline character.

Motivation[edit]

Suppose we want to print out Hello, on one line, followed by world! on the next line. One could attempt to represent the string to be printed as a single literal as follows:

This is not valid in C, since a string literal may not span multiple logical source lines. This can be worked around by printing the newline character using its numerical value (0x0A in ASCII),

This instructs the program to print Hello,, followed by the byte whose numerical value is 0x0A, followed by world!. While this will indeed work when the machine uses the ASCII encoding, it will not work on systems that use other encodings, that have a different numerical value for the newline character. It is also not a good solution because it still does not allow to represent a newline character inside a literal, and instead takes advantage of the semantics of printf. In order to solve these problems and ensure maximum portability between systems, C interprets n inside a literal as a newline character, whatever that may be on the target system:

In this code, the escape sequencen does not stand for a backslash followed by the letter n, because the backslash causes an 'escape' from the normal way characters are interpreted by the compiler. After seeing the backslash, the compiler expects another character to complete the escape sequence, and then translates the escape sequence into the bytes it is intended to represent. Thus, 'Hello,nworld!' represents a string with an embedded newline, regardless of whether it is used inside printf or anywhere else.

This raises the issue of how to represent an actual backslash inside a literal. This is done by using the escape sequence , as seen in the next section.

Some languages don't have escape sequences, for example Pascal. Instead a command including a newline would be used (writeln includes a newline, write excludes it).

Table of escape sequences[edit]

The following escape sequences are defined in standard C. This table also shows the values they map to in ASCII. However, these escape sequences can be used on any system with a C compiler, and may map to different values if the system does not use a character encoding based on ASCII.

Note 1.^ Common non-standard code; see the Notes section below.

Note 2.^ There may be one, two, or three octal numerals n present; see the Notes section below.

Note 3.^ u takes 4 hexadecimal digits h; see the Notes section below.

Note 4.^ U takes 8 hexadecimal digits h; see the Notes section below.

Notes[edit]

n produces one byte, despite the fact that the platform may use more than one byte to denote a newline, such as the DOS/Windows CR-LF sequence, 0x0D 0x0A. The translation from 0x0A to 0x0D 0x0A on DOS and Windows occurs when the byte is written out to a file or to the console, and the inverse translation is done when text files are read.

A hex escape sequence must have at least one hex digit following x, with no upper bound; it continues for as many hex digits as there are. Thus, for example, xABCDEFG denotes the byte with the numerical value ABCDEF₁₆, followed by the letter G, which is not a hex digit. However, if the resulting integer value is too large to fit in a single byte, the actual numerical value assigned is implementation-defined. Most platforms have 8-bit char types, which limits a useful hex escape sequence to two hex digits. However, hex escape sequences longer than two hex digits might be useful inside a wide character or wide string literal(prefixed with L):

An octal escape sequence consists of followed by one, two, or three octal digits. The octal escape sequence ends when it either contains three octal digits already, or the next character is not an octal digit. For example, 11 is a single octal escape sequence denoting a byte with numerical value 9 (11 in octal), rather than the escape sequence 1 followed by the digit 1. However, 1111 is the octal escape sequence 111 followed by the digit 1. In order to denote the byte with numerical value 1, followed by the digit 1, one could use '1'1', since C automatically concatenates adjacent string literals. Note that some three-digit octal escape sequences may be too large to fit in a single byte; this results in an implementation-defined value for the byte actually produced. The escape sequence 0 is a commonly used octal escape sequence, which denotes the null character, with value zero.

Non-standard escape sequences[edit]

A sequence such as z is not a valid escape sequence according to the C standard as it is not found in the table above. The C standard requires such 'invalid' escape sequences to be diagnosed (i.e., the compiler must print an error message). Notwithstanding this fact, some compilers may define additional escape sequences, with implementation-defined semantics. An example is the e escape sequence, which has 1B as the hexadecimal value in ASCII, represents the escape character, and is supported in GCC,^[2]clang and tcc. It wasn't however added to the C standard repertoire, because it has no meaningful equivalent in some character sets (such as EBCDIC).^[1]

Universal character names[edit]

From the C99 standard, C has also supported escape sequences that denote Unicode code points in string literals. Such escape sequences are called universal character names, and have the form uhhhh or Uhhhhhhhh, where h stands for a hex digit. Unlike the other escape sequences considered, a universal character name may expand into more than one code unit.

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The sequence uhhhh denotes the code pointhhhh, interpreted as a hexadecimal number. The sequence Uhhhhhhhh denotes the code point hhhhhhhh, interpreted as a hexadecimal number. (Therefore, code points located at U+10000 or higher must be denoted with the U syntax, whereas lower code points may use u or U.) The code point is converted into a sequence of code units in the encoding of the destination type on the target system. For example, consider

The string s1 will contain a single byte (not counting the terminating null) whose numerical value, the actual value stored in memory, is in fact 0xC0. The string s2 will contain the character 'Á', U+00C1 LATIN CAPITAL LETTER A WITH ACUTE. On a system that uses the UTF-8 encoding, the string s2 will contain two bytes, 0xC3 0xA1. The string s3 contains a single wchar_t, again with numerical value 0xC0. The string s4 contains the character 'À' encoded into wchar_t, if the UTF-16 encoding is used, then s4 will also contain only a single wchar_t, 16 bits long, with numerical value 0x00C0. A universal character name such as U0001F603 may be represented by a single wchar_t if the UTF-32 encoding is used, or two if UTF-16 is used.

Importantly, the universal character name u00C0 always denotes the character 'À', regardless of what kind of string literal it is used in, or the encoding in use. Again, U0001F603 always denotes the character at code point 1F603₁₆, regardless of context. On the other hand, octal and hex escape sequences always denote certain sequences of numerical values, regardless of encoding. Therefore, universal character names are complementary to octal and hex escape sequences; while octal and hex escape sequences represent 'physical' code units, universal character names represent code points, which may be thought of as 'logical' characters.

See also[edit]

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References[edit]

1. ^ ^ab'Rationale for International Standard - Programming Languages - C'(PDF). 5.10. April 2003. Archived(PDF) from the original on 2016-06-06. Retrieved 2010-10-17.
2. ^'6.35 The Character <ESC> in Constants'. GCC 4.8.2 Manual. Archived from the original on 2019-05-12. Retrieved 2014-03-08.

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Further reading[edit]

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• ISO/IEC 9899:1999, Programming languages — C
• Kernighan, Brian W.; Ritchie, Dennis M. (2003) [1988]. The C Programming Language (2 ed.). Prentice Hall. ISBN978-0-13308621-8.
• Lafore, Robert (2001). Object-Oriented Programming in Turbo C++ (1 ed.). Galgotia Publications. ISBN978-8-18562322-1.

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