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round up issues.

Posted on 2004-10-06
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Last Modified: 2010-04-01
Hi i am having some problem.
let say i have this value,

double amount = 1000;

if I divide this 1000 with 12, i will have 833.33333333333
so, what i do is i round it with 2 decimal point, to become 833.33

but when end of the day, i want to sum up all the 833.33, means 833.33 * 12, i will only get 9999.96, lost 0.04

How can i resovle this issues?? Can i use BigDecimal?? If yes, how can i apply the technique to sovle this issues?
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Question by:chainreaction
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9 Comments
 
LVL 35

Expert Comment

by:TimYates
ID: 12236343
Don't round it to 2dp...

Just display it as 2dp to the user, using java.text.DecimalFormat, but keep the number as 833.3333333333333333
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Author Comment

by:chainreaction
ID: 12245018
but how many decimla point i should keep?

How many decimla point "double" and bigDecimal can handle?

Fiurther, this 8333.3333 is going to stored into the DB and in the data field, i onluy cater for 4 decimal.

What is the common solution for this?

Thank You.
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LVL 35

Accepted Solution

by:
TimYates earned 1000 total points
ID: 12246466
> i onluy cater for 4 decimal.

?

Why not assign the field type as DOUBLE, then it is a 64 bit floating point number, and you can just store the java double as it is into the databse...

> How many decimla point "double" and bigDecimal can handle?

It depends on the size of the integral part of the double, but it should be plenty for your application...

>  but how many decimla point i should keep?

All of them....save it in a double, never change it from a double and just display it to the user as a String...  But really it will be a double...
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Author Comment

by:chainreaction
ID: 12247121
OK. I am using Oracle, let say for example. in the table filed. if i choose the table field  type as Number, i will have to specified the "scale" of the Number. I have to decide what is the decimal point i should allow it to insert.

And if i am in Db2, i also need to specify the scale of the number data type.

Are we referring to the same things??
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LVL 35

Expert Comment

by:TimYates
ID: 12248053
Why don't you define it as type "DOUBLE"?
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Author Comment

by:chainreaction
ID: 12255364
in the database? Do we have the DOUBLE data type in databse??
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LVL 35

Expert Comment

by:TimYates
ID: 12256814
yeah.  then you shouldn't need to round the double at all...
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