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

Sprite version 1.0  —  May 12, 1986