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)

Check Out this Related Man Page

SQRT(3) BSD Library Functions Manual SQRT(3)NAME
cbrt, cbrtf, cbrtl, sqrt, sqrtf, sqrtl -- cube root and square root functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
cbrt(double x);
float
cbrtf(float x);
long double
cbrtl(long double x);
double
sqrt(double x);
float
sqrtf(float x);
long double
sqrtl(long double x);
DESCRIPTION
The cbrt(), cbrtf(), and cbrtl() functions compute the cube root of x.
The sqrt(), sqrtf(), and sqrtl() functions compute the non-negative square root of x.
RETURN VALUES
The cbrt(), cbrtf(), and cbrtl() functions return the requested cube root. The sqrt(), sqrtf(), and sqrtl() functions return the requested
square root unless an error occurs. An attempt to take the sqrt() of negative x raises an invalid exception and causes an NaN to be returned
(except that the square root of -0 is valid and equal to -0.)
SEE ALSO fenv(3), math(3)STANDARDS
The cbrt(), cbrtf(), cbrtl(), sqrt(), sqrtf(), and sqrtl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
The cbrt() function appeared in 4.3BSD. The sqrtl() function appeared in FreeBSD 8.0. The cbrtl() function appeared in FreeBSD 9.0.
BSD March 5, 2011 BSD