fabs, fabsf

Calculates the absolute value of the floating-point argument.

double fabs( 
   double x 
);
float fabs(
   float x 
); // C++ only
long double fabs(
   long double x
); // C++ only
float fabsf( 
   float x 
);

Параметры

fabs returns the absolute value of its argument. There is no error return.

Input	SEH Exception	Matherr Exception
± QNAN,IND	none	_DOMAIN

C++ allows overloading, so you can call overloads of fabs. In a C program, fabs always takes and returns a double.

Function	Required header
fabs, fabsf	<math.h>

For additional compatibility information, see Compatibility in the Introduction.

See the example for abs.