Get number of digits before decimal point

c#, decimal, numbers

Solution

Solution without converting to `string` (which can be dangerous in case of exotic cultures):

static int GetNumberOfDigits(decimal d)
{
    decimal abs = Math.Abs(d);

    return abs < 1 ? 0 : (int)(Math.Log10(decimal.ToDouble(abs)) + 1);
}

Note, that this solution is valid for all decimal values

UPDATE

In fact this solution does not work with some big values, for example: `999999999999998`, `999999999999999`, `9999999999999939`...

Obviously, the mathematical operations with `double` are not accurate enough for this task.

While searching wrong values I tend to use `string`-based alternatives proposed in this topic. As for me, that is the evidence that they are more reliable and easy-to-use (but be aware of cultures). Loop-based solutions can be faster though.

Thanks to commentators, shame on me, lesson to you.

Problem

I have a variable of `decimal` type and I want to check the number of digits before decimal point in it. What should I do? For example, `467.45` should return `3`.

Original source

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