Trouble adding two double values

[ahsuman]

Hai ,

This is a bit weird for me.It may be that i got it wrong, but i request you to respond please.

All i need to do is add two double values

Dim a as double =324.0
Dim b as double=0.1
Dim c ad double

c=a+b


i expected the output to be c= 324.1 but i am getting 324.1015625, i tried using decimal datatype also but same problem.

i am inserting c value in sql server 2005 db there i am getting c value as 324.1015625, but in the code i am getting 324.1, why is this?,the datatype field for c in db is float.


please give me the vb.net code handle this.

[chinu]

Hai ,

This is a bit weird for me.It may be that i got it wrong, but i request you to respond please.

All i need to do is add two double values

Dim a as double =324.0
Dim b as double=0.1
Dim c ad double

c=a+b


i expected the output to be c= 324.1 but i am getting 324.1015625, i tried using decimal datatype also but same problem.

i am inserting c value in sql server 2005 db there i am getting c value as 324.1015625, but in the code i am getting 324.1, why is this?,the datatype field for c in db is float.


please give me the vb.net code handle this.

Its quite suprising to see this as i dont think anyone will get other than 324.1 as I also tried in both C# and VB.net. can u delete the pdb files and open the project once again and try.

[Motoma]

I believe this is due to decimal rounding on the server.

When I do the following:

DECLARE @a AS FLOAT
SET @a = 324.1
SELECT @a
 

I recieve 324.100000000002 as my result.

If I were to venture a guess, it would go something like this: SQL Server is going to try and store the data in such a way that the value you INSERT and the value you SELECT will be the same value. There are tricks and hacks in the driver to get this to happen, and this is what you are seeing here.

[ahsuman]

i still have the same problem please help , i tried using decimal datatype in .net but i am getting the same result

[Motoma]

i still have the same problem please help , i tried using decimal datatype in .net but i am getting the same result

What amount of precision are you aiming for? Can't you use one of the rounding functions to get what you are looking for?

[qkhader]

hi
i am having the same problem, but a work around this is

double a =2.1
double b = 0.1
double c = System.Convert.ToDouble(( a+b).ToString());

i know this is not a good solution but will do tell i can find something else, please update as well if you have a better solution

thanks