Decimals not rounding properly

I have a decimal field that holds a percentage value, such as 37.5 or 62.5

I convert that to an integer to remove the decimals. However, it isn't rounding up and down properly when it is .5

37.5 rounds up to 38.
62.5 rounds down to 62.
87.5 rounds up to 88.

Everything else works as expected.

Anyone know why this is and how to fix it?

thanks!
LVL 2
Starr DuskkASP.NET VB.NET DeveloperAsked:
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Pawan KumarDatabase ExpertCommented:
You need

37.5 -> 37 for this ??

In maths when the first number after the decimal point is 5 and since it is is greater than 4 so our rounded number will be 37 + 1 = 38.
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Pawan KumarDatabase ExpertCommented:
edited my first comment.
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Starr DuskkASP.NET VB.NET DeveloperAuthor Commented:
I found out that asp.net does what is called banker's rounding.

The theory is that if every .5 is rounded up, your results will eventually be off, too high. So it rounds some less and some higher. I don't know the specific rules, but found the overview explanation.

Here is an article about banker's rounding:
https://www.wyzant.com/resources/blogs/331496/rounding_rules_when_to_round_and_how_do_you_round_5_s_up_or_down

If I want to override it I can use Math.Round with an overload for MidpointRounding.

thanks!
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it_saigeDeveloperCommented:
I cannot reproduce your issue:
using System;
using System.Linq;

namespace EE_Q29066147
{
    class Program
    {
        static void Main(string[] args)
        {
            var decimals = new[] { 37.5m, 62.5m, 87.5m };
            Console.WriteLine(string.Join(Environment.NewLine, (from d in decimals
                                                                select $"{{{d} rounded equals {Math.Round(d, MidpointRounding.AwayFromZero)}}}")));
            Console.ReadLine();
        }
    }
}

Open in new window

Produces -Capture.PNG
What are your actual values and how are you rounding?

-saige-
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Starr DuskkASP.NET VB.NET DeveloperAuthor Commented:
I should give it_saige some points since he was likely formulating his tests and response when I found the solution to be to use MidpointRounding.AwayFromZero.
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Starr DuskkASP.NET VB.NET DeveloperAuthor Commented:
Complete answer and explanation why it doesn't work.
0
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