The **`cbrt()` function** of the `cmath` library allows you to take the *cubic root* of any number. 

**Cubic root** is a math function that finds `x` by following the equation below.

$$y = x^{3}$$

For a given `y` we can find `x` by taking $\sqrt[3]{y}$.

The `cbrt()` function in `cmath` takes a number of any type in the argument and returns its cubic root. The returned value can be a `float`, `double`, `long double` or `int`.

Let's see different examples of how the `cbrt()` function can be used below. 

#include <iostream>
#include <cmath>
using namespace std;

int main() {
  // input output both of same type
  double x0, y0 = 589.6;
  x0 = cbrt(y0);
  cout << "Cubic root of " << y0 << " is : " << x0 << endl;

  //input output both of different type
  double x1;
  float y1 = 512;
  x1 = cbrt(y1);
  cout << "Cubic root of " << y1 << " is : " << x1 << endl;
  
  // output as an integer 
  // notice that the output will discard any decimal places
  int x2;
  long double y2 = 56972.3;
  x2 = cbrt(y2);
  cout << "Cubic root of " << y2 << " is : " << x2 << endl;

  return 0;
}

How to use cbrt( ) in C++

The cbrt() function of the cmath library allows you to take the cubic root of any number. Cubic root is a math function that finds x by following the equation below. y=x3y = x^{3} y=x3 For a given y we can find x by taking y3\sqrt[3]{y}3y​. The cbrt() function in cmath takes a number of any type in the argument and returns its cubic root. The returned value can be a float, double, long double or int. Let s see different examples of how the cbrt() function can be used below. 