# 2.11BSD#431 - /usr/man/cat3/cbrt.0

    SQRT(3M)	    UNIX Programmer's Manual		 SQRT(3M)

    NAME
         cbrt, sqrt - cube root, square root

    SYNOPSIS
         #include <math.h>

         double cbrt(x)
         double x;

         double sqrt(x)
         double x;

    DESCRIPTION
         Cbrt(x) returns the cube root of x.

         Sqrt(x) returns the square root of x.

    DIAGNOSTICS
         On a VAX, sqrt(negative) returns the reserved operand and
         sets errno to EDOM .

    ERROR (due to Roundoff etc.)
         Cbrt is accurate to within 0.7 ulps.
         Sqrt on a VAX is accurate to within 0.501 ulps.
         Sqrt on a machine that conforms to IEEE 754 is correctly
         rounded in accordance with the rounding mode in force; the
         error is less than half an ulp in the default mode
         (round-to-nearest).  An ulp is one Unit in the Last Place
         carried.

    SEE ALSO
         math(3M), infnan(3M)

    AUTHOR
         W. Kahan

    Printed 11/26/99	  May 12, 1986				1

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