How to trim decimal?

Question

I have a decimal number :

decimal a = 0.8537056986486486486486486486;

I want to show it as string with only 8 digit after point : a equals -> "0.85370569". How can I do it ?

This page could help : http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx — Laurent S., Apr 15 '13 at 14:04

score 1 · Answer 1 · answered Apr 15 '13 at 14:03

1

For example, like this:

a.ToString("0.00000000");

answered Apr 15 '13 at 14:03

Hikiko

309
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1

This would round to *70 – Alex K. Apr 15 '13 at 14:04

ThaMe90 · Answer 2 · 2013-04-15T14:16:54.010

1

Try using

a.ToString("D8");

This should convert it to the correct format.

Edit:

As said in the comments, D is only used for integral types, thus not for decimals and such. Use

static void Main(string[] args)
{
    decimal d = (decimal)0.8537056986486486486486486486;
    Console.WriteLine(d.ToString("N8"));
    Console.ReadLine();
}

instead.

This will format it to 0.85370570

edited Apr 15 '13 at 14:16

answered Apr 15 '13 at 14:06

ThaMe90

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Isn't this only for integral types? – torrential coding Apr 15 '13 at 14:08
Not according to [msdn](http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx) – ThaMe90 Apr 15 '13 at 14:08
@ThaMe90 Please read the description on msdn: "Supported by: Integral types only." Or, am I mistaken? – torrential coding Apr 15 '13 at 14:10
Could be that it is `a.ToString("N8");`, but I don't know for sure... – ThaMe90 Apr 15 '13 at 14:10
I tried using that with a `decimal` type but it throws an exception: "Format specifier was invalid." – torrential coding Apr 15 '13 at 14:13
Yeah, same here... I'll update the answer to use N instead of D... – ThaMe90 Apr 15 '13 at 14:14

zandi · Answer 3 · 2013-04-15T14:14:02.653

0

 decimal a = 0.8537056986486486486486486486;    
 var v=  a.ToString("#.########");

edited Apr 15 '13 at 14:14

answered Apr 15 '13 at 14:08

zandi

704
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Phil Applegate · Accepted Answer · 2013-04-19T11:56:58.697

0

To perform this numerically you could use:

decimal a = (decimal) 0.8537056986486486486486486486;
String test = (Math.Truncate(100000000 * a) / 100000000).ToString();

edited Apr 19 '13 at 11:56

answered Apr 15 '13 at 14:11

Phil Applegate

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Instead of casting you could also add the [flag](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types#real-literals) `m` at the end of the number. – Flimtix Apr 08 '22 at 09:13

How to trim decimal?

4 Answers4