fabsf(3) - Linux man page

Name

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

Synopsis

#include <math.h>

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

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

fabsf(), fabsl():

_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

Description

The fabs() 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.

Conforming To

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)