# Introduction :

*cbrt* function is used to find out the cube root of a number in *C++*. In this tutorial, we will learn how to use *cbrt* function with an example.

## cbrt function :

*cbrt* is used to find the cube root of a number in *C++*. This is defined in *cmath* header file.

## Definition :

As per *C++ 11* specification, *cbrt* is defined as below :

```
double cbrt (double x);
float cbrt (float x);
long double cbrt (long double x);
double cbrt (T x);
```

The last one is for *integral* type. This overloaded method casts the *integral* type to *double*.

## Parameter and Return value :

This method takes a parameter of type *double, float, long double*, or *integral* type.

It returns the *cubic root* of the parameter.

## Example :

In this example, we will take the number as input from the user.

```
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n;
cout << "Enter a number to find out the cubic root : " << endl;
cin >> n;
cout << "The cubic root is : " << cbrt(n) << endl;
return 0;
}
```

## Sample Output :

```
Enter a number to find out the cubic root :
27
The cubic root is : 3
```