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FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN cppreference.com
cppreference.com

FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN

cppreference.com

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#define FP_NORMAL /*implementation defined*/
( C++11)
#define FP_SUBNORMAL /*implementation defined*/
( C++11)
#define FP_ZERO /*implementation defined*/
( C++11)
#define FP_INFINITE /*implementation defined*/
( C++11)
#define FP_NAN /*implementation defined*/
( C++11)
FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN . , .
:
The FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN macros each represent a distinct category of floating-point numbers. They all expand to an integer constant expression.
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. .
Constant
:
Constant
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. .
Explanation
FP_NORMAL
, , .. , , -
:
indicates that the value is normal, i.e. not an infinity, subnormal, not-a-number or zero
Google.
. .
FP_SUBNORMAL
, '
:
indicates that the value is subnormal
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. .
FP_ZERO
,
:
indicates that the value is positive or negative zero
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. .
FP_INFINITE
, ( )
:
indicates that the value is not representable by the underlying type (positive or negative infinity)
Google.
. .
FP_NAN
, - (NaN)
:
indicates that the value is not-a-number (NaN)
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. .

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