csqrt, csqrtf, csqrtl - complex square root
#include <complex.h>
double complex csqrt(double complex z);
float complex csqrtf(float complex z);
long double complex csqrtl(long double complex z);
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.)
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| csqrt (), csqrtf (), csqrtl () | Thread safety | MT-Safe |
glibc 2.1. C99, POSIX.1-2001.