NAME

       csqrt, csqrtf, csqrtl - complex square root

LIBRARY

       Math library (libm, -lm)

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

       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.)

ATTRIBUTES

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

       ┌───────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                      │ Attribute     │ Value   │
       ├───────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │csqrt(), csqrtf(), csqrtl()                                    │ Thread safety │ MT-Safe │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO

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