hi
how to take 6 numbers after the dot - but without round the number ?
for example:
102.123456789 => 102.123456
9.99887766 => 9.998877
in C# winforms
thak's in advance
views:
143answers:
6
+10
A:
You can use the Math.Truncate method and a 10^6 multiplier:
decimal x = 102.12345689m;
decimal m = 1000000m;
decimal y = Math.Truncate(m * x) / m;
Console.WriteLine(y); // Prints 102.123456
Thomas Levesque
2010-08-12 12:20:03
That truncates to an integer - http://msdn.microsoft.com/en-us/library/c2eabd70.aspx "Truncate rounds d to the nearest integer towards zero."
ChrisF
2010-08-12 12:20:37
@ChrisF, indeed; I updated my answer
Thomas Levesque
2010-08-12 12:25:07
@Chris: the code works. He's using the 10^6 multiplier to work around that issue - actually fairly elegant, and much cleaner than using strings!
Dan Puzey
2010-08-12 12:27:24
@Dan - The code was edited after @ChrisF downvoted, check the edits.
TheCloudlessSky
2010-08-12 12:28:36
@TheCloudlessSky - just to point out I didn't downvote, just commented. I like to give people chance to correct their posts first.
ChrisF
2010-08-12 12:36:56
It's not showing any edit here :-/
Dan Puzey
2010-08-12 12:40:23
@Dan, I think that's because I deleted the answer, then edited and undeleted it.
Thomas Levesque
2010-08-12 12:47:25
@Thomas, can you just edit your answer then I can remove the down vote. You are correct, I had downvoted the original answer and was in the process of adding a comment when you deleted your original answer. I've just tried to remove down vote and it's telling me it's locked unless you edit the answer.
Paul Hadfield
2010-08-12 13:04:33
@Paul Hadfield: done
Thomas Levesque
2010-08-12 13:13:11
@Thomas: Ok, sorted.
Paul Hadfield
2010-08-12 13:36:00
A:
I know this is ugly using strings, but thought I'd put it anyway:
double x = 9.9887766;
string[] xs = x.ToString().Split('.');
double result = double.Parse(xs[0] + "." + xs[1].Substring(0, Math.Min(xs[1].Length, 6)));
TheCloudlessSky
2010-08-12 12:22:48
Similar to my solution but you've provided actual code. If you go this route, you may want to check that xs[1] is not null first (calling sub string would through an exception). Also for non null values, what happens if it contains less than 6 characters.
Paul Hadfield
2010-08-12 12:24:47
@Paul - Yeah I caught the 2nd part just before you replied. But yeah... this is a really crude example. If the OP wants to always check if `xs[1]` is null/non-existent then he can do so.
TheCloudlessSky
2010-08-12 12:27:42
A:
Might be a long winded way, but how about turning it into a string, locating the decimal point and then grabbing the string minus anything after the 6th decimal place. You could then turn it back into a decimal.
Paul Hadfield
2010-08-12 12:23:24
A:
It's crude but how about:
decimal Number = 102.123456789;
string TruncateTarget = Number.ToString();
decimal FinalValue = Decimal.Parse(TruncateTarget.Substring(0, TruncateTarget.IndexOf('.') +6));
Lazarus
2010-08-12 12:24:38
+2
A:
public decimal TruncateDecimal(decimal decimalToTruncate, uint numberOfDecimalPlacse)
{
decimal multiplication_factor = (decimal)Math.Pow(10.0, numberOfDecimalPlacse);
decimal truncated_value = (long)(multiplication_factor * decimalToTruncate);
return (truncated_value / multiplication_factor);
}
SwDevMan81
2010-08-12 12:45:01