Name

cbrt, sqrt − cube root, square root

Syntax

#include <math.h>

double cbrt(x)
double x;

double sqrt(x)
double x;

float fsqrt(float x)
float x;

Description

The cbrt function returns the cube root of x.

The sqrt and fsqrt functions return the square root of x for double and float data types respectively.

Diagnostics

The sqrt function returns the default quiet NaN when x is negative indicating the invalid operation. 

Error (due to roundoff, etc.)

The cbrt function is accurate to within 0.7 ulps. 

The sqrt function on this machine conforms to IEEE 754 and 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)