SQRT(3M) 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 4.3 Berkeley Distribution May 12, 1986 SQRT(3M)