@c ----------------------------------------------------------------------
@node sqrt, math
@subheading Syntax

@example
#include <math.h>

double sqrt(double x);
@end example

@subheading Description

This function computes the square root of @var{x}.

@subheading Return Value

The square root of @var{x}.  If @var{x} is negative or a @code{NaN}, the
return value is @code{NaN} and @code{errno} is set to @code{EDOM}.

@subheading Portability

@portability ansi, posix