sqrt(3M)

NAME

sqrt, cbrt − square root, cube root

cc [ flag ... ] file ... −lm [ library ... ]

#include <math.h>

double sqrt(double x);

double cbrt(double x);

MT-Safe

sqrt(x) returns the square root of x, correctly rounded according to ANSI/IEEE 754-1985.

cbrt(x) returns the cube root of x. cbrt() is accurate to within 0.7 ulps.

For exceptional cases, matherr(3M) tabulates the values to be returned as dictated by various Standards.