NAME¶

fabs, fabsf, fabsl - absolute value of floating-point number

LIBRARY¶

Math library (libm, -lm)

SYNOPSIS¶

#include <math.h>

double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);

fabsf(), fabsl():

    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L


        || /* Since glibc 2.19: */ _DEFAULT_SOURCE


        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION¶

These functions return the absolute value of the floating-point number x.

RETURN VALUE¶

These functions return the absolute value of x.

If x is a NaN, a NaN is returned.

If x is -0, +0 is returned.

If x is negative infinity or positive infinity, positive infinity is returned.

ERRORS¶

No errors occur.

ATTRIBUTES¶

For an explanation of the terms used in this section, see attributes(7).

STANDARDS¶

C11, POSIX.1-2008.

HISTORY¶

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO¶

abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)