Make round a decimal value

Question

Hello. I am developing a financial program. I use decimal as a main data type in my application. Sometimes, I need to make round a decimal value. Please tell me some functions to solve my problem. Example:

d = 12345678.376

Create a Round1 function so that:
Round1(d, 2) = 12345678.38
Round1(d, -4) = 12350000

Create a Round2 function so that
Round2(d, 2) = 12345678.37
Round2(d, -4) = 12340000

I tried some functions from Math class but failed. Please help me. Thanks.

Answer 1

Hi,
have a look at this link
http://msdn.microsoft.com/en-us/library/7x5bacwt(VS.80).aspx

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Best Regards, C.Gnanadurai ----------------------- Please mark the post as answer if it is helpfull to you

Answer 2

Hi,
have a look at this link
http://msdn.microsoft.com/en-us/library/7x5bacwt(VS.80).aspx

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Best Regards, C.Gnanadurai ----------------------- Please mark the post as answer if it is helpfull to you

It don't help me anything. It only a custom string format for a numeric value. Please understand my question: I want to make round a numeric value, not formatting output string. Thanks.

Answer 3

Hi,

Hope these are what you are looking for.

        public static decimal Round(decimal d,int decimals)
        {
            if (decimals < 0)
            {
                decimal pow=Convert.ToDecimal(Math.Pow(10, -decimals));
                return Convert.ToInt32((d / pow))*pow;
            }
            else
            {
                return Math.Round(d, decimals);
            }
        }
        public static decimal Round2(decimal d, int decimals)
        {
            if (decimals < 0)
            {
                decimal pow = Convert.ToDecimal(Math.Pow(10, -decimals));
                return Math.Floor((d / pow)) * pow;
            }
            else
            {
                decimal pow = Convert.ToDecimal(Math.Pow(10, decimals));
                d = d * pow;
                return Math.Floor(d)/pow;
            }
        }

Answer 4

I checked Round1 , it isn't right. This is my fix:

public static decimal RoundUp(decimal value, int decimals)
        {
            if (decimals < 0)
            {
                decimal pow = Convert.ToDecimal(Math.Pow(10, -decimals));
                decimal d1 = value / pow;
                decimal d2 = Math.Truncate(d1);
                if (d1 != d2)
                {
                    d2 = d2 + 1;
                }
                return d2 * pow;
            }
            else
            {
                decimal pow = Convert.ToDecimal(Math.Pow(10, decimals));
                decimal d1 = value* pow;
                decimal d2 = Math.Truncate(d1);
                if(d1 != d2)
                {
                    d2 = d2 + 1;
                }
                return d2 / pow;
            }
        }

Thanks.