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History of C

Early C

Standard C

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  1. codified existing practices
    2. -
  2. new features: volatile, enum, signed, void, locales
    3. -
  3. From C++: const, function prototypes
    4. -
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  1. greatly expanded wide and multibyte character support (<wctype.h>, <wchar.h>, additions and changes to stream I/O, etc)
    2. -
  2. digraphs, <iso646.h>,
    3. -
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  1. new features: bool, long long, <stdint.h>, <inttypes.h>, restrict, compound literals, variable length arrays, flexible array members, designated initializers, <fenv.h>, variadic macros, complex numbers, __func__, hexadecimal floating point format (%a), monetary formatting in lconv, isblank, concatenation of narrow and wide string literals, trailing comma in enumerations, empty arguments in function-like macros, STDC_* pragmas, va_copy, null return of tmpnam, null pointer in setvbuf, hh and ll length-specifiers in printf, snprintf, _Exit, <tgmath.h>, POSIX-like strftime specifiers
    2. -
  2. from C++: inline, mix declarations and code, declarations in the init-clause of the for loop, // comments, universal character names in source code
    3. -
  3. removed implicit functions and implicit int
    4. -
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  1. thread-aware memory model, <stdatomic.h>, <threads.h>, type-generic functions, alignas/alignof, noreturn, static_assert, analyzability extensions, extensions to complex and imaginary types, anonymous structures and unions, exclusive file open mode, quick_exit
    2. -
  2. removed gets
    3. -
  3. from Bounds-checking interfaces TR: bounds-checking interfaces,
    4. -
  4. from Unicode TR: char16_t, char32_t, and <uchar.h>
    5. -
  1. provides changes to C11 (mostly to Annex F) that cover all basic requirements and some recommendations of IEC 60559:2011 (C11 was built on IEC 60559:1989)
  1. provides changes to C11 to support all the requirements, plus some basic recommendations, of IEC 60559:2011 for decimal floating-point arithmetic. This supersedes ISO/IEC TR 24732:2009.
  1. provides changes to C11 to support the recommendations of IEC 60559:2011 for extended floating‐point formats and the interchange formats, both arithmetic and non-arithmetic.
  1. provides changes to C11 to support all mathematical operations recommended by IEC 60559:2011, including trigonometry in π units, inverse square root, compounded interest, etc.
  1. provides changes to C11 to support all supplementary attributes (evaluation model, exception handling, reproducibility, etc) recommended by IEC 60559:2011
Main Article: C17
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Defect Reports fixed in C17 (54 defects)
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Future development

  1. List of issues that were not granted DR status: (N2556 2020-08-02)
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-Main Article: C23
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Next major C language standard revision
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Defect Reports fixed in C23 (? defects)
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See also

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C++ documentation for History of C++
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1. -The Development of the C Language by Dennis M. Ritchie
2. -Rationale for the C99 standard
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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
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