Performing Math operations on decimal datatype in C#?

Question

I was wondering if the above was at all possible. For example:

Math.Sqrt(myVariableHere);

When looking at the overload, it requires a doub

Answer 1

I don't understand why all the answers to that question are the same.

There are several ways to calculate the square root from a number. One of them was proposed by Isaac Newton. I'll only write one of the simplest implementations of this method. I use it to improve the accuracy of double's square root.

// x - a number, from which we need to calculate the square root
// epsilon - an accuracy of calculation of the root from our number.
// The result of the calculations will differ from an actual value
// of the root on less than epslion.
public static decimal Sqrt(decimal x, decimal epsilon = 0.0M)
{
    if (x < 0) throw new OverflowException("Cannot calculate square root from a negative number");

    decimal current = (decimal)Math.Sqrt((double)x), previous;
    do
    {
        previous = current;
        if (previous == 0.0M) return 0;
        current = (previous + x / previous) / 2;
    }
    while (Math.Abs(previous - current) > epsilon);
    return current;
}

About speed: in the worst case (epsilon = 0 and number is decimal.MaxValue) the loop repeats less than a three times.

If you want to know more, read this (Hacker's Delight by Henry S. Warren, Jr.)