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# signbit

From cppreference.com
< c‎ | numeric‎ | math

Defined in header `<math.h>` |  |
#define signbit(arg) /* implementation defined */ |  | (since C99)

Determines if the given floating point number `arg` is negative. The macro returns an integral value.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

Nonzero integral value if `arg` is negative, ​0​ otherwise

### [edit] See also

fabs | absolute value of a floating point value (|x|) (function) [edit]
copysign (C99) | copies the sign of a floating point value (function) [edit]
C++ documentation for signbit

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