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How to round a number in vb.net

Posted on 2011-09-20
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Last Modified: 2012-05-12
Hi Experts,
I need to round numbers up and keep 4 decimal places. as I understand vb does not round up but down.for example the number 0.3456712 needs to be a double type:0.3457
how can I do that please??
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Question by:Hagita
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4 Comments
 
LVL 1

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jdruper earned 63 total points
ID: 36567532
Hi Hagita,

All you need to do is use the Math.Round() method, it will round up or down depending on your number, you can also use its overload to specify how many places you want to round.

For example:

Math.Round(0.3456712 , 4) will return 0.3457

Math.Round(2.34 , 2) will return 2.30

Hope this helps.
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LVL 18

Assisted Solution

by:lludden
lludden earned 125 total points
ID: 36567541
VB.Net does standard rounding.  If value is .5 or more, it rounds up, else it rounds down

        Dim v As Double = 0.3456712
        MsgBox(Math.Round(v, 4).ToString)

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LVL 18

Assisted Solution

by:lludden
lludden earned 125 total points
ID: 36567559
Actually, it is more precise than that.  The standard method for rounding is that if it is >.5 is rounds up, if it is less than .5 it rounds down.  If it is exactly .5, it rounds either up or down, depending on the value of the previous digit - odd rounds up, even rounds down.

So 1.0055 rounded to 3 places is 1.006 and 1.0045 is 1.005
This is the standard way to even out rounding errors.
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LVL 15

Assisted Solution

by:x77
x77 earned 62 total points
ID: 36567598
       Dim x = Math.Round(1234.545, 2, MidpointRounding.AwayFromZero) ' Result: 1234,55
        Dim y = Math.Round(1234.545, 2, MidpointRounding.ToEven)              'Result:1234,54

Use AwayFromZero to minimize error.

Use ToEven where you are using money. Bank round.
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