FP_ZERO

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Defined in header <cmath>

#define FP_ZERO /*implementation defined*/
(C++11 feature)

The FP_ZERO macro expands to an integer constant expression. It represents a type of floating point values and indicates that the value is positive or negative zero.

[edit] See also

fpclassify (C++11)
categorizes the given floating point value
(function)
FP_INFINITE (C++11)
indicates infinite floating point value
(macro constant)
FP_NAN (C++11)
indicates not-a-number (NaN)
(macro constant)
FP_NORMAL (C++11)
indicates normal number
(macro constant)
FP_SUBNORMAL (C++11)
indicates subnormal number
(macro constant)