How to round decimal

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Hi,
I want to round down,round up the decimal number.
For example,12.9879-->12.97--round down
12.9879--->12.99--round up

Posted 16-May-13 2:36am

bhuvana.k

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CPallini 16-May-13 8:42am

12.9879-->12.97
This is not round-down. The correct round-down here is: 12.9879-->12.98

lukeer 16-May-13 8:46am

I understand why you want to round 12.9879 up with two decimals to 12.99.
But I cannot think of anything sane that would result in rounding the same number down even below 12.98.
Please use the "Improve question" link and provide some more insight on the problem.

3 solutions

Solution 1

Firstly your rounding logic in your question appears to be wrong.... 12.9879 should round down to 12.98 if you want it to round down.

However, it took me all of about 2 seconds with google to find this link:

http://stackoverflow.com/questions/2632753/rounding-values-up-or-down-in-c-sharp[^]

Posted 16-May-13 2:43am

Pheonyx

Solution 2

public static decimal Round(
decimal d,
int decimals
)

where d - A decimal number to be rounded, and decimals - The number of decimal places in the return value.

Posted 16-May-13 2:47am

Alexander Dymshyts

Updated 16-May-13 3:27am

v2

Comments

CPallini 16-May-13 9:13am

That is 'round', i.e. not 'round-up' neither 'round-down'.

Alexander Dymshyts 16-May-13 9:32am

Thnx for fixing )

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-16T03:58:00

I doubt you really need rounding per se. It is almost never needed. Chances are, you only need to present the value on screen in a rounded form. And this is something different, as you don't do rounding directly and only use proper string formatting. Please see:
http://msdn.microsoft.com/en-us/library/fzeeb5cd.aspx[^],
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx[^],
http://msdn.microsoft.com/en-us/library/0c899ak8.aspx[^].

Note that is is also safer then rounding: you guarantee that rounding does not sneak into calculations and does not cause precision loss.

—SA