CODEWITHSUNDEEP
c#.net
Moe Sisko
Moe Sisko

Reputation: 12005

Get number of significant digits to the right of decimal point in c# Decimal

I would like a c# function with this signature:

int GetSignificantNumberOfDecimalPlaces(decimal d)

It should behave as follows when called: 

    GetSignificantNumberOfDecimalPlaces(2.12300m); // returns 3
    GetSignificantNumberOfDecimalPlaces(2.123m);   // returns 3
    GetSignificantNumberOfDecimalPlaces(2.103450m);  // returns 5
    GetSignificantNumberOfDecimalPlaces(2.0m); // returns 0
    GetSignificantNumberOfDecimalPlaces(2.00m); // returns 0
    GetSignificantNumberOfDecimalPlaces(2m); // returns 0

i.e. for a given decimal, i want the number of significant decimal places to the right of the decimal point. So trailing zeros can be ignored. My fallback is to turn the decimal into a string, trim trailing zeros, and get the length this way. But is there a better way ?

NOTE: I may be using the word "significant" incorrectly here. The required return values in the example should hopefully explain what i'm after.

Upvotes: 7

Views: 5212

Answers (4)

mindOfAi
mindOfAi

Reputation: 4622

I think this was answered before: stackoverflow.com/a/13493771/4779385

decimal argument = 123.456m;
int count = BitConverter.GetBytes(decimal.GetBits(argument)[3])[2];

Upvotes: 0

sujith karivelil
sujith karivelil

Reputation: 29006

I can help you to do the same with a few string operations, This may be a workaround solution for your problem, anyway consider this suggestion, and hope that it would help you

static int GetSignificantNumberOfDecimalPlaces(decimal d)
{
    string inputStr = d.ToString(CultureInfo.InvariantCulture);
    int decimalIndex = inputStr.IndexOf(".") + 1;
    if (decimalIndex == 0)
    {
        return 0;
    }
    return inputStr.Substring(decimalIndex).TrimEnd(new[] { '0' }).Length;    
}

Working Example with all the specified inputs

Upvotes: 3

Ranjith A Francis
Ranjith A Francis

Reputation: 1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace NumberofOnes

{

public class Program

{

    static void Main(string[] args)

    {

        Console.WriteLine("enter numbers");

        decimal argument = Convert.ToDecimal(Console.ReadLine());

        double count = Convert.ToDouble(decimal.Remainder(argument, 1));

        string number = count.ToString();

        int decimalCount = 0;

        if (number.Length > 1)

        {

            decimalCount = number.Length - 2;

        }

        Console.WriteLine("decimal:" + decimalCount);

        Console.ReadKey();

    }

}

}

hope this work!!

Upvotes: -1

Slai
Slai

Reputation: 22876

Some very good answers here Parse decimal and filter extra 0 on the right?

decimal d = -123.456700m;

decimal n = d / 1.000000000000000000000000000000m;  // -123.4567m

int[] bits = decimal.GetBits(n);

int count = bits[3] >> 16 & 255; // 4        or byte count = (byte)(bits[3] >> 16);

Upvotes: 6

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