why put double square brackets in an if clause? Post: 302096345

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csqrt

csqrt(3M)						  Mathematical Library Functions						 csqrt(3M)

NAME

       csqrt, csqrtf, csqrtl - complex square root functions

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #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 compute the complex square root of z, with a branch cut along the negative real axis.

RETURN VALUES

       These functions return the complex square root value, in the range of the right half-plane (including the imaginary axis).

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cabs(3M), complex.h(3HEAD), cpow(3M), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2002								 csqrt(3M)