# cbrt(3m) [ultrix man page]

```sqrt(3m)																  sqrt(3m)

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 function returns the cube root of x.

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

Error Due to Roundoff and Other Reasons
The function is accurate to within 0.7 ulps.

The 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.

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

math(3m)

RISC								  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.)