# csqrt(3) [v7 man page]

```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);

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.

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

2017-09-15								  CSQRT(3)```

## Check Out this Related Man Page

```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);

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.