csqrt(3) — Linux manual pages

Linux manual pages	Section 3

Name

csqrt, csqrtf, csqrtl — complex square root

Synopsis

#include <complex.h>

double complex csqrt( double complex z);

float complex csqrtf( float complex z);

long double complex csqrtl( long double complex z);

	Note
	Link with `−lm`.

DESCRIPTION

Calculate the square root of a given complex number, with nonnegative real part, and 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.)

VERSIONS

These functions first appeared in glibc in version 2.1.

CONFORMING TO

C99.

COLOPHON

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