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man:sqrtf

SQRT(3) Linux Programmer's Manual SQRT(3)

NAME

     sqrt, sqrtf, sqrtl - square root function

SYNOPSIS

     #include <math.h>
     double sqrt(double x);
     float sqrtf(float x);
     long double sqrtl(long double x);
     Link with -lm.
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     sqrtf(), sqrtl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

     These functions return the nonnegative square root of x.

RETURN VALUE

     On success, these functions return the square root of x.
     If x is a NaN, a NaN is returned.
     If x is +0 (-0), +0 (-0) is returned.
     If x is positive infinity, positive infinity is returned.
     If x is less than -0, a domain error occurs, and a NaN is returned.

ERRORS

     See  math_error(7) for information on how to determine whether an error
     has occurred when calling these functions.
     The following errors can occur:
     Domain error: x less than -0
            errno is set  to  EDOM.   An  invalid  floating-point  exception
            (FE_INVALID) is raised.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     allbox; lbw24 lb  lb  l  l  l.   Interface Attribute Value  T{  sqrt(),
     sqrtf(), sqrtl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

     cbrt(3), csqrt(3), hypot(3)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                           SQRT(3)
/data/webs/external/dokuwiki/data/pages/man/sqrtf.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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