projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f9628029 KM |
1 | .\" Copyright (c) 1985 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 8220ec5a | 5 | .\" @(#)sqrt.3 6.2 (Berkeley) %G% |
| f9628029 KM |
6 | .\" |
| 7 | .TH SQRT 3M "" | |
| 8 | .UC 6 | |
| cd30a7d2 | 9 | .ds up \fIulp\fR |
| 44887795 MAN |
10 | .SH NAME |
| 11 | cbrt, sqrt \- cube root, square root | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
| 14 | .B #include <math.h> | |
| 15 | .PP | |
| 16 | .B double cbrt(x) | |
| 17 | .B double x; | |
| 18 | .PP | |
| 19 | .B double sqrt(x) | |
| 20 | .B double x; | |
| 21 | .fi | |
| 22 | .SH DESCRIPTION | |
| cd30a7d2 | 23 | Cbrt(x) returns the cube root of x. |
| 44887795 | 24 | .PP |
| cd30a7d2 | 25 | Sqrt(x) returns the square root of x. |
| 44887795 | 26 | .SH DIAGNOSTICS |
| cd30a7d2 MAN |
27 | On a VAX, sqrt(negative) |
| 28 | returns the reserved operand and sets \fIerrno\fR to EDOM . | |
| 29 | .SH ERROR (due to Roundoff etc.) | |
| 30 | Cbrt is accurate to within 0.7 \*(ups. | |
| 31 | .br | |
| 32 | Sqrt on a VAX is accurate to within 0.501 \*(ups. | |
| 33 | .br | |
| 34 | Sqrt on a machine that conforms to IEEE 754 is correctly rounded | |
| 35 | in accordance with the rounding mode in force; the error is less than | |
| 36 | half an \*(up in the default mode (round\-to\-nearest). | |
| 37 | An \*(up is one \fIU\fRnit in the \fIL\fRast \fIP\fRlace carried. | |
| 8220ec5a MK |
38 | .SH SEE ALSO |
| 39 | math(3M), infnan(3M) | |
| 44887795 MAN |
40 | .SH AUTHOR |
| 41 | W. Kahan |