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2.21 csqrt, csqrtf—complex square root

Synopsis 

     #include <complex.h>
     double complex csqrt(double complex z);
     float complex csqrtf(float complex z);

Description
These functions compute the complex square root of z, with a branch cut along the negative real axis.

csqrtf is identical to csqrt, except that it performs its calculations on floats complex.
Returns
The csqrt functions return the complex square root value, in the range of the right halfplane (including the imaginary axis).
Portability
csqrt and csqrtf are ISO C99