How to convert to double with 2 precision - string after dot?

Question

I want to convert this string: 0.55000000000000004 to this double: 0.55. How to do that?

mjyazdani · Answer 1 · 2013-07-11T08:42:37.730

52

you can use this code to reduce precision part:

double m = Math.Round(0.55000000000000004,2);

Result would be : 0.55

edited Jul 11 '13 at 08:42

answered Aug 12 '12 at 07:59

mjyazdani

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score 32 · Accepted Answer · answered Feb 14 '11 at 20:54

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Is a string or a double? If it is a string:

double d = double.Parse(s,CultureInfo.InvariantCulture);
string s=string.Format("{0:0.00}",d);

if it is already a double just format using the second line.

answered Feb 14 '11 at 20:54

Felice Pollano

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The CultureInfo.InvariantCulture format provider is the one to use if your decimal separator is always ".", what exactly you need to know ? – Felice Pollano Feb 14 '11 at 21:03
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And if you want to do it without trailing zeroes you can use [{0:#,0.######}](http://stackoverflow.com/a/20146494/492336) – sashoalm Jun 20 '16 at 08:49

score 12 · Answer 3 · answered Feb 14 '11 at 20:55

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There is no double 0.55 - the number cannot be accurately represented as a binary fraction. Which is probably the reason why you got that long string in the first place. You should probably be using the decimal type instead of double.

Read The Floating-Point Guide to understand why.

answered Feb 14 '11 at 20:55

Michael Borgwardt

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@PokemonCraft: No. What you need is to understand why what you want is impossible and does not make sense. – Michael Borgwardt Feb 14 '11 at 21:11

How to convert to double with 2 precision - string after dot?

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