Limiting double to 3 decimal places

by

Doubles don’t have decimal places – they’re not based on decimal digits to start with. You could get “the closest double to the current value when truncated to three decimal digits”, but it still wouldn’t be exactly the same. You’d be better off using decimal.

Having said that, if it’s only the way that rounding happens that’s a problem, you can use Math.Truncate(value * 1000) / 1000; which may do what you want. (You don’t want rounding at all, by the sounds of it.) It’s still potentially “dodgy” though, as the result still won’t really just have three decimal places. If you did the same thing with a decimal value, however, it would work:

decimal m = 12.878999m;
m = Math.Truncate(m * 1000m) / 1000m;
Console.WriteLine(m); // 12.878

EDIT: As LBushkin pointed out, you should be clear between truncating for display purposes (which can usually be done in a format specifier) and truncating for further calculations (in which case the above should work).

More Related Contents:

  1. How to generate an Array of Double Arrays in c#? [duplicate]
  2. How do I parse a string with a decimal point to a double?
  3. How can I divide two integers to get a double?
  4. When should I use double instead of decimal?
  5. Comparing double values in C#
  6. How To Represent 0.1 In Floating Point Arithmetic And Decimal
  7. decimal vs double! – Which one should I use and when? [duplicate]
  8. How to convert a Decimal to a Double in C#?
  9. Converting string to double in C#
  10. C# Double – ToString() formatting with two decimal places but no rounding
  11. How to change symbol for decimal point in double.ToString()?
  12. How do I truncate a .NET string?
  13. Double precision problems on .NET
  14. Formatting a double to two decimal places
  15. Double.TryParse or Convert.ToDouble – which is faster and safer?
  16. What’s the best way to compare Double and Int?
  17. What’s wrong with this division? [closed]
  18. Truncate string on whole words in .NET C#
  19. Why is a round-trip conversion via a string not safe for a double?
  20. Performing Math operations on decimal datatype in C#?
  21. Input string was not in a correct format #2
  22. How to convert Decimal to Double in C#?
  23. I got error “The DELETE statement conflicted with the REFERENCE constraint”
  24. Round double in two decimal places in C#?
  25. Converting a double to an int in C#
  26. Formatting a string into columns using String Interpolation
  27. Why is this simple calculation of two doubles inaccurate? [duplicate]
  28. C# Converting 20 digit precision double to string and back again
  29. double minus double giving precision problems
  30. Double vs Decimal Rounding in C#

Leave a Comment