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);
DESCRIPTION
The
csqrt(),
csqrtf()
and
csqrtl()
functions compute the complex square root of z.
If z = x + iy, then
Re csqrt(z) = [ (|z| + x) / 2 ]^(1/2). Im csqrt(z) = [ (|z| - x) / 2 ]^(1/2).
Note that -csqrt(z) is also a square root of z. The root chosen is always in the right half plane and Im csqrt(z) has the same sign as y.
RETURN VALUES
The csqrt(),
csqrtf() and csqrtl()
functions return the complex square root of z.
SEE ALSO
STANDARDS
The csqrt(),
csqrtf() and csqrtl()
functions conform to ISO/IEC 9899:1999
(“ISO C99”).