CODEWITHSUNDEEP
c#roundingprecision
shprei
shprei

Reputation: 55

set precision c#

Is it possible to set precision of double values in c# for all double values included in the project? I have a lot of values there and changing them with Math.Round would be exhausting. I need to have the double value as 5.12345 instead of 5.123455123321321 for example.

Upvotes: 2

Views: 1029

Answers (1)

TheGeneral
TheGeneral

Reputation: 81583

This is a fundamental limitation of floating point types.. double is actually store internally as a sign exponent and mantissa, the exponent is base 2, so has a lot of trouble dealing with base 10..

The easiest solution is to use a base 10 64bit floating point type, namely decimal. Its still floating point, it still only limited precision but it is a lot friendly and more accurate to work with in a lot of cases

Update

If all you want to do is change the display output, you can either use rounding (which you know), or the appropriate format specifiers with string.format ToString or string interpolation

Example

var number = 5.123455123321321;
Console.WriteLine(number.ToString("F3", 
                  CultureInfo.InvariantCulture));
Console.WriteLine($"{number:F3}");
// Displays 5.123
// Displays 5.123

Upvotes: 2

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