csqrt man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

csqrt, csqrtf, csqrtl — complex square root functions


#include <complex.h>

double complex csqrt(double complex z);
float complex csqrtf(float complex z);
long double complex csqrtl(long double complex z);


The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1‐2008 defers to the ISO C standard.

These functions shall compute the complex square root of z, with a branch cut along the negative real axis.

Return Value

These functions shall return the complex square root value, in the range of the right half-plane (including the imaginary axis).


No errors are defined.

The following sections are informative.

See Also

cabs(), cpow()

The Base Definitions volume of POSIX.1‐2008, <complex.h>


2013 IEEE/The Open Group POSIX Programmer's Manual