csqrt(3) - phpMan

CSQRT(3)                   Linux Programmer's Manual                  CSQRT(3)
NAME
       csqrt, csqrtf, csqrtl - complex square root
SYNOPSIS
       #include <complex.h>
       double complex csqrt(double complex z);
       float complex csqrtf(float complex z);
       long double complex csqrtl(long double complex z);
       Link with -lm.
DESCRIPTION
       These  functions  calculate the complex square root of z, with a branch
       cut along the negative real axis.   (That  means  that  csqrt(-1+eps*I)
       will be close to I while csqrt(-1-eps*I) will be close to -I, if eps is
       a small positive real number.)
VERSIONS
       These functions first appeared in glibc in version 2.1.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +----------------------------+---------------+---------+
       |Interface                   | Attribute     | Value   |
       +----------------------------+---------------+---------+
       |csqrt(), csqrtf(), csqrtl() | Thread safety | MT-Safe |
       +----------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
       cabs(3), cexp(3), complex(7)
COLOPHON
       This  page  is  part of release 4.15 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                          CSQRT(3)