Find Cube root of a number Using System.Math.Pow() method in C#

Question

While writing a program I came across finding the cube root of a number in one of my functions.

when I used the below code, I was getting an incorrect value for the

Answer 1

The error (which, by the way, is just 4E-16 - 400 quintillionths) is caused by floating point errors.

You could circumvent this by rounding the number if it is within a certain threshold:

public static void cubicPairs(double n)
{
    double root = (System.Math.Pow(n, (1/3)));
    double roundedRoot = Math.Round(root);

    if (Math.Abs(roundedRoot - root) < VERY_SMALL_NUMBER)
        return roundedRoot;
    else
        return root;
}

Where VERY_SMALL_NUMBER can be, say, 1e-10.