Linux Standard Base Core Specification 3.2
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__signbit

Name

__signbit -- test sign of floating point value

#include <math.h>

int __signbit(double arg);

__signbit() has the same specification as signbit() in ISO POSIX (2003), except that the argument type for __signbit() is known to be double.

__signbit() is not in the source standard; it is only in the binary standard.

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