In this C++ tutorial, you will learn how to compute cube root of a given number using cbrt() function of cmath, with syntax and examples.

## C++ cbrt()

C++ cbrt() computes cube root of given number (argument).

## Syntax

The syntax of C++ cbrt() is

`cbrt(x)`

where

Returns

The return value depends on the type of value passed for parameter x.

The return value of cbrt(x) is

• double if x is double or integral type.
• float if x is float.
• long double if x is long double.

The synopsis of cbrt() function is

```double cbrt(double x);
float cbrt(float x);
long double cbrt(long double x);
double cbrt(T x); // for integral type argument values```

cbrt() is a function of cmath library. Include cmath library at the start of program, if using cbrt() function.

## Example

In this example, we read a value from user into variable x, and find its cube root using cbrt() function.

C++ Program

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

int main() {
double x;
cout << "Enter a number : ";
cin >> x;

double result = cbrt(x);
cout << "cbrt(" << x << ") : " << result << endl;
}```

Output

```Enter a number : 27
cbrt(27) : 3
Program ended with exit code: 0```
```Enter a number : -27
cbrt(-27) : -3
Program ended with exit code: 0```

## Conclusion

In this C++ Tutorial, we learned the syntax of C++ cbrt(), and how to use this function to find the cube root of given number, with the help of examples.