SQRT(3) | Library Functions Manual | SQRT(3)

# NAME

`cbrt`, `cbrtf`, `cbrtl`, `sqrt`, `sqrtf`, `sqrtl` — cube root and square root functions

# SYNOPSIS

Math Library (libm, -lm)
`#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`() function computes the cube root of x. The `cbrtf`() function is a single precision version of `cbrt`(). The `cbrtl`() function is an extended precision version of `cbrt`().

The `sqrt`() function computes the non-negative square root of x. The `sqrtf`() function is a single precision version of `sqrt`(). The `sqrtl`() function is an extended precision version of `sqrt`().

# RETURN VALUES

If x is negative, `sqrt`(x), `sqrtf`(x) and `sqrtl`(x) set the global variable errno to `EDOM`.

# HISTORY

A `sqrt`() function first appeared in Version 2 AT&T UNIX.

The `cbrt`() function appeared in 4.3BSD.

June 7, 2025 | Debian