NAME

fabs, fabsf, fabsl —

floating-point absolute value functions

LIBRARY

Math Library (libm, -lm)

#include <math.h>

double
fabs(double x);

float
fabsf(float x);

long double
fabsl(long double x);

The fabs(), fabsf() and fabsl() functions compute the absolute value of a floating-point number x.

The fabs(), fabsf() and fabsl() functions return the absolute value of x.

The fabs() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).