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# std::signbit

From cppreference.com
< cpp‎ | numeric‎ | math

Defined in header `<cmath>` |  |
bool signbit( float arg ); |  | (since C++11)
bool signbit( double arg ); |  | (since C++11)
bool signbit( long double arg ); |  | (since C++11)

Determines if the given floating point number `arg` is negative.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

true if `arg` is negative, false otherwise

### [edit] See also

abs(float) fabs | absolute value of a floating point value (|x|) (function) [edit]
copysign (C++11) | copies the sign of a floating point value (function) [edit]
C documentation for signbit

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