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C99 From cppreference.com < c   C
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ISO/IEC 9899:1999, a.k.a. C99, is a previous revision of the C standard.

This section is incompleteReason: core/library features, TC1~TC3, DRs

Contents

  • 1 Obsolete
    • 1.1 Removed
    • 1.2 Deprecated
  • 2 New language features
    • 2.1 Feature test macros for optional features
  • 3 New library features
    • 3.1 New headers
    • 3.2 Library features
  • 4 Defect reports
  • 5 Compiler support
    • 5.1 C99 core language features

[edit] Obsolete

[edit] Removed

  • Implicit int in declarations
  • Implicit function declarations

[edit] Deprecated

  • gets()

[edit] New language features

  • Universal-character-names in identifiers
  • Increased translation limits
  • // comments
  • restrict pointers
  • Enhanced arithmetic types
    • _Bool
    • long long and unsigned long long
    • Extended integer types
    • _Complex types (float _Complex, double _Complex, and long double _Complex)
    • _Imaginary types (float _Imaginary, double _Imaginary, and long double _Imaginary)
  • Flexible array members
  • Variable-length array (VLA) types and variably-modified (VM) types
  • Improvements of braced-init-list for array, struct and union types
    • Non-constant initializers
    • Designated initializers
  • Idempotent cvr-qualifiers
  • Trailing comma in enumerator-list
  • Hexadecimal floating constants
  • Compound literals
  • Floating-point environment
  • Requiring truncation for divisions of signed integer types
  • Implicit return 0; in the main() function
  • Declarations and statements in mixed order
  • init-statement in for loops
  • inline functions
  • Predefined variable __func__
  • Cvr-qualifiers and static in [] within function declarations
  • Variadic macros
  • _Pragma preprocessor operator
  • Standard pragmas for floating-point evaluation
    • STDC FENV_ACCESS
    • STDC FP_CONTRACT
    • STDC CX_LIMITED_RANGE

[edit] Feature test macros for optional features

  • __STDC_IEC_559__
    • Indicates IEEE-754 binary floating-point arithmetic and required math functions are supported.
  • __STDC_IEC_559_COMPLEX__
    • Indicates IEEE-754 complex arithmetic and required math functions are supported.
  • __STDC_HOSTED__
    • Indicates that the implementation is hosted.
  • __STDC_ISO_10646__
    • Indicates that Unicode is used by the wide literal encodings and expands to the latest supported revision.
  • __STDC_MB_MIGHT_NEQ_WC__
    • Indicates that there are some characters in the basic character set having different code unit values in ordinary and wide literal encodings.

[edit] New library features

[edit] New headers

  • <complex.h>
  • <fenv.h>
  • <inttypes.h>
  • <stdbool.h>
  • <stdint.h>
  • <tgmath.h>

[edit] Library features

  • Aliases for integer types
    • Integer types with exact width (intN_t and uintN_t)
    • Fastest integer types with at least given width (int_fastN_t and uint_fastN_t)
    • Smallest integer types with at least given width (int_leastN_t and uint_leastN_t)
    • Integer types capable for cast between object pointers (intptr_t and uintptr_t)
    • Integer types with maximum width (intmax_t and uintmax_t)
  • Operations on long long and intmax_t
    • llabs()
    • imaxabs()
    • lldiv()
    • imaxdiv()
  • Floating-point environment access
  • Extended floating-point math functions
    • New floating-point math functions
    • -f and -l variants for existing and new floating-point math functions
    • Math error handling
  • Complex functions
  • _Exit()
  • Formatting support for long long, unsigned long long, intmax_t, and uintmax_t
    • atoll()
    • strtoimax()
    • strtoll()
    • strtoull
    • strtoumax()
    • wcstoimax()
    • wcstoll()
    • wcstoull()
    • wcstoumax()
  • isblank() and iswblank()
  • snprintf() and vsnprintf()
  • vfscanf() and vfwscanf() function families
  • Extensions for fscanf() and fprintf() function families
    • ll length modifier for long long and unsigned long long
    • hh length modifier for signed char and unsigned char
    • l length modifier for double
    • z length modifier for size_t and its signed version
    • t length modifier for ptrdiff_t and its unsigned version
    • j length modifier for intmax_t and uintmax_t
    • a conversion specifier for floating-point types
  • Numeric limit macros for long long and unsigned long long
  • Numeric limit macros corresponding to existing and new aliases for integer types
  • Format string macros for integer types
  • va_copy
  • Type-generic math macros
  • Floating-point comparison macros
  • Floating-point classification macros
  • Compatibility macros for _Bool (bool, true, and false)

[edit] Defect reports

Template:c/language/history/DR99

[edit] Compiler support

[edit] C99 core language features

This section is incompleteReason: needs to list C compilers, verification
C99 feature  Paper(s)  GCC Clang MSVC Apple Clang EDG eccp Intel C++ IBM XL C++ IBM Open XL C++ for AIX IBM Open XL C++ for z/OS Sun/Oracle C++ Embarcadero C++ Builder Cray Nvidia HPC C++ (ex PGI)* Nvidia nvcc
Universal-character-names in identifiers N/A 3.1 Yes Yes
Increased translation limits N590 0.9 N/A
// comments N644 2.7 Yes Yes
restrict pointers N448 2.95 Yes partial*
Enhanced arithmetic types N815N601N620N638N657N694N809 Yes partial Maybe
Flexible array members N/A 3.0 Yes Yes
Variable-length array (VLA) types N683 0.9 Yes
Variably-modified (VM) types N2778 N/A Yes
Designated initializers N494 3.0 Yes Yes
Non-constant initializers N/A 1.21 N/A
Idempotent cvr-qualifiers N505 3.0 N/A
Trailing comma in enumerator-list N/A 0.9 Yes Yes
Hexadecimal floating constants N308 2.8 Yes Yes
Compound literals N716 3.1 Yes Yes
Floating-point environment N/A partial partial
Requiring truncation for divisions of signed integer types N617 0.9 N/A
Implicit return 0; in the main() function N/A Yes Yes Yes
Declarations and statements in mixed order N740 3.0 Yes Yes
init-statement in for loops N/A Yes Yes Yes
inline functions N741 4.3 Yes Yes
Predefined variable __func__ N611 2.95 Yes Yes
Cvr-qualifiers and static in [] within function declarations N/A 3.1 Yes
Variadic macros N707 2.95 Yes Yes
_Pragma preprocessor operator N634 3.0 Yes partial*
Standard pragmas for floating-point evaluation N631N696 No No Yes
 C99 feature  Paper(s) GCC Clang MSVC Apple Clang EDG eccp Intel C++ IBM XL C++ IBM Open XL C++ for AIX IBM Open XL C++ for z/OS Sun/Oracle C++ Embarcadero C++ Builder Cray Nvidia HPC C++ (ex PGI)* Nvidia nvcc
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