# Find the cube root of a number in C++

# 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

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