csqrt, csqrtf, csqrtl

#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.

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.)

These functions first appeared in glibc in version 2.1.

For an explanation of the terms used in this section, see attributes(7).

C99, POSIX.1-2001, POSIX.1-2008.

cabs(3), cexp(3), complex(7)

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