#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).
|csqrt(), csqrtf(), csqrtl()||Thread safety||MT-Safe|
C99, POSIX.1-2001, POSIX.1-2008.
cabs(3), cexp(3), complex(7)
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complex(7), conj(3), sqrt(3).
The man pages csqrtf(3) and csqrtl(3) are aliases of csqrt(3).