How to get the decimal part of a double C# with plus or minus symbol

Question

1.00/5 (1 vote)

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I have got but I need If decimal part is less then 0.5 result contains minus(-) symbol. and if decimal part is greater then equal 0.5 result contains plus (+) symbol.
I using following code but It returns all the decimal number with (+) symbol.

suppose
456.45 [output should be -.45 ]
456.65 [output should be +.65 ]

thanks in advance

What I have tried:

C#

double value = Convert.ToDouble(textBox5.Text);
            int result = (int)(((decimal)value % 1) * 100);

            if ((result)<0.5)
            {
                textBox6.Text = "-" + result.ToString();
            }
            else
            {
                textBox6.Text = "+" + result.ToString();
            }

Posted 4-May-16 5:44am

arvindispra

Updated 31-May-20 22:48pm

Santosh Kokatnur

v3

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Comments

ZurdoDev 4-May-16 11:50am

One easy way is to convert to string and split on the "." and then examine the second part. Probably a better way though.

F-ES Sitecore 4-May-16 12:05pm

What if the code is run in a locale where "," is the separator?

ZurdoDev 4-May-16 12:08pm

It won't work.

Philippe Mori 4-May-16 12:39pm

Learn how to use a debugger.

If you would read carefully your own code, you would see many problems in it. Integer do not have fractionnal part so it make absolutly no sense at all to compare the result with 0.5. Also, you multiply the text box content by 100 but the rest of the code does not take that into account. And we haven't even talk about type conversion....

Philippe Mori 4-May-16 12:40pm

When you post a question, make the effort to properly format code in a code block. As t, your question does not even worth 1 point.

Sergey Alexandrovich Kryukov 4-May-16 13:21pm

First and foremost: a floating-point number does not have "decimal part".
—SA

3 solutions

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OriginalGriff · Accepted Answer · 2016-05-04T05:56:00

Solution 1

Try:

C#

double d = 456.45;
double x = d - Math.Truncate(d);
if (x < 0.5) x = -x;
Console.WriteLine(x);

Posted 4-May-16 5:56am

OriginalGriff

Andy Lanng · Accepted Answer · 2016-05-04T05:57:00

Solution 2

You're multiplying by 100 and then comparing it to 0.5!

C#

double value = Convert.ToDouble(textBox5.Text);
int result = (int)(((decimal)value % 1) * 100);

if ((result)<50)
{
textBox6.Text = "-" + result.ToString();
}
else
{
textBox6.Text = "+" + result.ToString();
}

Posted 4-May-16 5:57am

Andy Lanng

F-ES Sitecore · Accepted Answer · 2016-05-04T06:05:00

Learn to debug your code. If you step through it what is in "result" for "456.45"? It is 45, yet you are assuming the result is 0.45. When you "% 1" something you get the remainder (.45) which you then multiply by 100 to get 45. I assume you are doing this to make it a valid int, but if you are comparing fractions then you can't use ints.

Secondly, don't use double for fractions with this kind of precision, use decimal as decimal is precise and double is an approximation of your number.

C#

decimal value = Convert.ToDecimal(textBox5.Text);
decimal result = value % 1;

if (result < 0.5M)