FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN

Defined in header `<math.h>`

#define FP_NORMAL /implementation defined/		(since C99)

#define FP_SUBNORMAL /implementation defined/		(since C99)

#define FP_ZERO /implementation defined/		(since C99)

#define FP_INFINITE /implementation defined/		(since C99)

#define FP_NAN /implementation defined/		(since C99)

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.


Constant	Explanation

`FP_NORMAL`	indicates that the value is normal, i.e. not an infinity, subnormal, not-a-number or zero

`FP_SUBNORMAL`	indicates that the value is subnormal

`FP_ZERO`	indicates that the value is positive or negative zero

`FP_INFINITE`	indicates that the value is not representable by the underlying type (positive or negative infinity)

`FP_NAN`	indicates that the value is not-a-number (NaN)

[edit] See also


fpclassify (C99)	categorizes the given floating point value (function)

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