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Difference between revisions of "cpp/types/climits"

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(Undo revision 86702 by 113.102.166.130 (talk))
(re-describing LDBL_DIG due to http://stackoverflow.com/questions/39703648)
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{{dsc header | cfloat}}
 
{{dsc header | cfloat}}
 
{{dsc macro const | FLT_RADIX | the radix (integer base) used by the representation of all three floating-point types | nolink=true }}
 
{{dsc macro const | FLT_RADIX | the radix (integer base) used by the representation of all three floating-point types | nolink=true }}
−
{{dsc macro const | DECIMAL_DIG | number of decimal digits that can be converted to {{c|long double}} and back without losing precision | nolink=true | notes={{mark c++11}}}}
+
{{dsc macro const | DECIMAL_DIG | number of decimal digits such that any floating-point number of type {{c|long double}} can be converted to text with these many decimal digits and back to the floating-point type again without change to the value | nolink=true | notes={{mark c++11}}}}
−
{{dsc macro const | FLT_DECIMAL_DIG<br>DBL_DECIMAL_DIG<br>LDBL_DECIMAL_DIG | number of decimal digits such that any floating-point number can be rounded to a floating-point number with this many decimal digits and back again without change to the value. Defined to at least 6, 10, and 10 respectively. | nolink=true | notes={{mark c++17}}}}
+
{{dsc macro const | FLT_DECIMAL_DIG<br>DBL_DECIMAL_DIG<br>LDBL_DECIMAL_DIG | number of decimal digits such that any floating-point number of type {{c|float}}/{{c|double}}/{{c|long double}} respectively can be converted to text with these many decimal digits and back to the floating-point type again without change to the value. Defined to at least 6, 10, and 10 respectively. | nolink=true | notes={{mark c++17}}}}
 
{{dsc macro const | FLT_MIN<br>DBL_MIN<br>LDBL_MIN | minimum value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_MIN<br>DBL_MIN<br>LDBL_MIN | minimum value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_TRUE_MIN<br>DBL_TRUE_MIN<br>LDBL_TRUE_MIN | minimum positive value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true |notes={{mark c++17}}}}
 
{{dsc macro const | FLT_TRUE_MIN<br>DBL_TRUE_MIN<br>LDBL_TRUE_MIN | minimum positive value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true |notes={{mark c++17}}}}
 
{{dsc macro const | FLT_MAX<br>DBL_MAX<br>LDBL_MAX | maximum value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_MAX<br>DBL_MAX<br>LDBL_MAX | maximum value of {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_EPSILON<br>DBL_EPSILON<br>LDBL_EPSILON | difference between {{c|1.0}} and the next representable value for {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_EPSILON<br>DBL_EPSILON<br>LDBL_EPSILON | difference between {{c|1.0}} and the next representable value for {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
−
{{dsc macro const | FLT_DIG<br>DBL_DIG<br>LDBL_DIG | number of decimal digits that can be represented without losing precision for {{c|float}}, {{c|double}} and {{c|long double}} respectively (see {{lc|std::numeric_limits::digits10}} for explanation) | nolink=true }}
+
{{dsc macro const | FLT_DIG<br>DBL_DIG<br>LDBL_DIG | number of base-10 digits that can be represented by {{c|float}}/{{c|double}}/{{c|long double}} respectively without change, that is preserved in text -> binary -> text roundtrip without change due to rounding or overflow (see {{lc|std::numeric_limits::digits10}} for explanation) | nolink=true }}
 
{{dsc macro const | FLT_MANT_DIG<br>DBL_MANT_DIG<br>LDBL_MANT_DIG | number of base {{tt|FLT_RADIX}} digits that can be represented without losing precision for {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_MANT_DIG<br>DBL_MANT_DIG<br>LDBL_MANT_DIG | number of base {{tt|FLT_RADIX}} digits that can be represented without losing precision for {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_MIN_EXP<br>DBL_MIN_EXP<br>LDBL_MIN_EXP | minimum negative integer such that {{tt|FLT_RADIX}} raised by power one less than that integer is a normalized {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}
 
{{dsc macro const | FLT_MIN_EXP<br>DBL_MIN_EXP<br>LDBL_MIN_EXP | minimum negative integer such that {{tt|FLT_RADIX}} raised by power one less than that integer is a normalized {{c|float}}, {{c|double}} and {{c|long double}} respectively | nolink=true }}

Revision as of 05:54, 28 September 2016

 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Type support
Basic types
Fixed width integer types (C++11)
Fixed width floating-point types (C++23)
(C++11)    
(C++17)
Numeric limits
C numeric limits interface
Runtime type information
 

See also std::numeric_limits interface.

Defined in header <cstdint>
PTRDIFF_MIN
(C++11)
 minimum value of object of std::ptrdiff_t type
(macro constant)
PTRDIFF_MAX
(C++11)
 maximum value of object of std::ptrdiff_t type
(macro constant)
SIZE_MAX
(C++11)
 maximum value of object of std::size_t type
(macro constant)
SIG_ATOMIC_MIN
(C++11)
 minimum value of object of std::sig_atomic_t type
(macro constant)
SIG_ATOMIC_MAX
(C++11)
 maximum value of object of std::sig_atomic_t type
(macro constant)
WCHAR_MIN
(C++11)
 minimum value of object of wchar_t type
(macro constant)
WCHAR_MAX
(C++11)
 maximum value of object of wchar_t type
(macro constant)
WINT_MIN
(C++11)
 minimum value of object of std::wint_t type
(macro constant)
WINT_MAX
(C++11)
 maximum value of object of std::wint_t type
(macro constant)

Limits of integer types

Defined in header <climits>
CHAR_BIT
 number of bits in byte
(macro constant)
MB_LEN_MAX
 maximum number of bytes in a multibyte character
(macro constant)
CHAR_MIN
 minimum value of char
(macro constant)
CHAR_MAX
 maximum value of char
(macro constant)
SCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN
(C++11)
 minimum value of signed char, short, int, long and long long respectively
(macro constant)
SCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX
(C++11)
 maximum value of signed char, short, int, long and long long respectively
(macro constant)
UCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX
(C++11)
 maximum value of unsigned char, unsigned short, unsigned int,
unsigned long and unsigned long long respectively
(macro constant)

Limits of floating point types

Defined in header <cfloat>
FLT_RADIX
 the radix (integer base) used by the representation of all three floating-point types
(macro constant)
DECIMAL_DIG
(C++11)
 number of decimal digits such that any floating-point number of type long double can be converted to text with these many decimal digits and back to the floating-point type again without change to the value
(macro constant)
FLT_DECIMAL_DIGDBL_DECIMAL_DIGLDBL_DECIMAL_DIG
(C++17)
 number of decimal digits such that any floating-point number of type float/double/long double respectively can be converted to text with these many decimal digits and back to the floating-point type again without change to the value. Defined to at least 6, 10, and 10 respectively.
(macro constant)
FLT_MINDBL_MINLDBL_MIN
 minimum value of float, double and long double respectively
(macro constant)
FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN
(C++17)
 minimum positive value of float, double and long double respectively
(macro constant)
FLT_MAXDBL_MAXLDBL_MAX
 maximum value of float, double and long double respectively
(macro constant)
FLT_EPSILONDBL_EPSILONLDBL_EPSILON
 difference between 1.0 and the next representable value for float, double and long double respectively
(macro constant)
FLT_DIGDBL_DIGLDBL_DIG
 number of base-10 digits that can be represented by float/double/long double respectively without change, that is preserved in text -> binary -> text roundtrip without change due to rounding or overflow (see std::numeric_limits::digits10 for explanation)
(macro constant)
FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG
 number of base FLT_RADIX digits that can be represented without losing precision for float, double and long double respectively
(macro constant)
FLT_MIN_EXPDBL_MIN_EXPLDBL_MIN_EXP
 minimum negative integer such that FLT_RADIX raised by power one less than that integer is a normalized float, double and long double respectively
(macro constant)
FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP
 minimum negative integer such that 10 raised by power one less than that integer is a normalized float, double and long double respectively
(macro constant)
FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP
 maximum positive integer such that FLT_RADIX raised by power one more than that integer is a normalized float, double and long double respectively
(macro constant)
FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP
 maximum positive integer such that 10 raised by power one more than that integer is a normalized float, double and long double respectively
(macro constant)
default rounding mode of floating-point arithmetics
(macro constant)
(C++11)
 specifies in what precision all arithmetic operations are done
(macro constant)
FLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM
(C++17)
 specifies whether the type supports subnormal (denormal) numbers: -1 indeterminable, 0 absent, 1 present
(macro constant)

See also

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