Mac Developer Library Developer
Search

 

This manual page is part of Xcode Tools version 5.0

To obtain these tools:

If you are running a version of Xcode Tools other than 5.0, view the documentation locally:

  • In Xcode

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.




FABS(3)                  BSD Library Functions Manual                  FABS(3)

NAME
     fabs -- floating-point absolute value function

SYNOPSIS
     #include <math.h>

     double
     fabs(double x);

     long double
     fabsl(long double x);

     float
     fabsf(float x);

DESCRIPTION
     The fabs() functions compute the absolute value of a floating-point number x.

SPECIAL VALUES
     fabs(+-_) returns 0.

     fabs(+-infinity) returns +infinity.

VECTOR OPERATIONS
     If you need to apply the fabs() function to SIMD vectors or arrays, using the following functions pro-vided provided
     vided by the Accelerate.framework may give significantly better performance:

     #include <Accelerate/Accelerate.h>

     vFloat vfabsf(vFloat x);
     void vvfabsf( float *y, const float *x, const int *n);
     void vvfabs(double *y, const double *x, const int *n);

SEE ALSO
     abs(3), ceil(3), floor(3), rint(3), math(3)

STANDARDS
     The fabs() functions conform to ISO/IEC 9899:2011.

BSD                            December 11, 2006                           BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.

Feedback