SQRT(3) BSD Library Functions Manual SQRT(3)[top]NAMEcbrt,sqrt— cube root and square root functionsSYNOPSIS#include <math.h> double cbrt(double x); double sqrt(double x);DESCRIPTIONThe cbrt() function computes the cube root of x. The sqrt() computes the non-negative square root of x.RETURN VALUESThe cbrt() function returns the requested cube root. The sqrt() function returns the requested square root unless an error occurs. On the VAX or Tahoe processor an attempt to take the sqrt() of negative x causes an error; in this event, the global variable errno is set to EDOM and a reserved operand fault is generated.ERROR (due to Roundoff etc.)The cbrt() function is accurate to within 0.7 ulps. The sqrt() function 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 ALSOmath(3), infnan(3)STANDARDSThesqrtfunction conforms to ANSI X3.159-1989 (“ANSI C89”).HISTORYThe cbrt function appeared in 4.3BSD.BSDJune 4, 1993 BSD

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