rounding float values in C#
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  1. #1
    Junior Member Xarzu's Avatar
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    rounding float values in C#

    I have a float data type in C#.
    Let's say its value is
    5.827671
    and I want to concat/round it to the nearest 100th place
    5.83
    How would I do that?

    The value is ported to a string by
    floatvalue.ToString()

  2. #2
    Just Another Geek
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    Simple, basic idea (pseudo-code as I don't know C#):
    Code:
    var a = 5.827671;
    var b,c;
    
    b = int( ( a  + .005 ) * 100 );
    c = b / 100;
    
    return c;
    The addition of 0.005 is to make sure it's rounded up or down correctly.
    Last edited by SirDice; August 31st, 2011 at 03:48 PM.
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  3. #3
    Senior Member mungyun's Avatar
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    If you don't intend on calculating further, you can also use ToString() formatting to get it rounded.

    So say you have your code like such:

    Code:
    decimal d = 5.827671;
    you could use

    Code:
    string rounded = d.ToString("0.##")
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  4. #4
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    Isn't there some sort of String.format? I feel like that would be cleaner than changing it to a string just to round.

  5. #5
    Senior Member mungyun's Avatar
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    Quote Originally Posted by metguru View Post
    Isn't there some sort of String.format? I feel like that would be cleaner than changing it to a string just to round.
    There is a String.Format but from what i can tell, it does the same thing as yourStringVar.ToString("YourFormatHere").

    And after looking a little bit, there is Math.Round(d,i) where you pass your decimal or double and the number of decimal places and it will pass back either a decimal or a double. That seems to be the best option if you plan to continue calculating.
    I believe in making the world safe for our children, but not our childrenís children, because I donít think children should be having sex. -- Jack Handey

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