csqrt man page

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);

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 safetyMT-Safe

Conforming to

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

See Also

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

Referenced By

complex(7), conj(3), sqrt(3).

Explore man page connections for csqrt(3).

csqrtf(3) and csqrtl(3) are aliases of csqrt(3).