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# cbrt() function with example in C++

C++ cbrt() function: Here, we are going to learn about the cbrt() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on April 26, 2019

## C++ cbrt() function

cbrt() function is a library function of cmath header, it is used to find the cubic root of a given number, it accepts a number and returns the cubic root.

## Syntax

Syntax of cbrt() function:

```cbrt(x);
```

## Parameter(s)

x – a number whose cubic root to be calculated.

## Return value

double – it returns double value that is the cubic root of the given number x.

## Sample Input and Output

```Input:
int x = 2;

Function call:
cbrt(x);

Output:
1.25992
```

## Example

```// C++ code to demonstrate the example of
// cbrt() function

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

// main code section
int main()
{
float x;

//input the value
cout<<"Enter a number: ";
cin>>x;

// calculate the square root
float result = cbrt(x);
cout<<"cubic root of "<<x<<" is = "<<result;
cout<<endl;

return 0;
}
```

### Output

```First run:
Enter a number: 10
cubic root of 10 is = 2.15443

Second run:
Enter a number: 123.45
cubic root of 123.45 is = 4.97925

Third run:
Enter a number: 0
cubic root of 0 is = 0

Fourth run:
Enter a number: -1234
cubic root of -1234 is = -10.726
```