How to decide number of decimals

Hi!
I wonder how I can decide how many decimals I want. I write a program where I use doubles, but there is no limit on how many decimals I get. How can I limit the decimal the easiest way?
for instance like this:
double a = 1.23
double b = 1.46
double c = a * bWhere c is in format x.xx (eg 2.34).
Also, is there a way to e.g tell that you want 2 decimals, but if the number you get is an integer (eg. 1), it will only say 1 and not 1.00.
Thank you in advance.

Cissi wrote:
Also, is there a way to e.g tell that you want 2 decimals, but if the number you get is an integer (eg. 1), it will only say 1 and not 1.00.There sure is, but this depends on your interpretation of what the double being an integral value means. You never want to deal with absolute == operations on doubles.
This is a way of telling whether a double is an integral value to 5 decimal places:
double a = 3.000006;
int factor = 100000;
if ( Math.round(a) * factor == (int) (a * factor) ) {
//a is an integer to 5 decimal places
}There are probably better ways to do this though; I don't use floating point numbers all that much in what I do.
edit I threw up a bit in my mouth after I read what I wrote there. Please don't use that. I wouldn't.
Edited by: endasil on Dec 20, 2007 9:53 AM

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dear bras
refer this
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How to shorten number of decimals

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Go to Preferences:Display and check that you have:
HTH
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How can we specify the number of decimals to be printed

How can we specify the number of decimals to be printed
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DESCRIBE TABLE
Syntax
DESCRIBE TABLE itab [KIND knd] [LINES lin] [OCCURS n].
Extras:
1. ... KIND knd
2. ... LINES lin
3. ... OCCURS n
Effect
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Notes
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Addition 1
... KIND knd
Effect
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Addition 2
... LINES lin
Effect
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Note
As of release 6.10, the current number of rows of an internal table can also be determined using the in-built function lines.
Addition 3
... OCCURS n
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Example
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TYPE-POOLS sydes.
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DATA tabkind(1) TYPE c.
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Syntax
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CONTEXT
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SYDES_CONTEXT-PROGRAM: Program-global type
SYDES_CONTEXT-FORM   : FORM-local type
SYDES_CONTEXT-FUNCTION: FUNCTION-local type
SYDES_CONTEXT-METHOD : METHOD-local type
IDX_CONTEXT_NAME
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IDX_HELP_ID
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    |FROM| TO |BACK|NAME|UTYP|EMSK|TYPE
|--||||||--
1 | 2 | 7 | 0 | 0 | 2 | 0 | v
2 | 0 | 0 | 1 | 6 | 0 | 4 | N
3 | 8 | 9 | 1 | 7 | 5 | 0 | u
4 | 10 | 12 | 1 | 8 | 0 | 0 | u
5 | 0 | 0 | 1 | 9 | 0 | 0 | P
6 | 13 | 13 | 1 | 11 | 0 | 0 | h
7 | 17 | 17 | 1 | 12 | 0 | 0 | h
8 | 0 | 0 | 3 | 13 | 0 | 0 | C
9 | 0 | 0 | 3 | 14 | 0 | 0 | C
10 | 0 | 0 | 4 | 15 | 0 | 0 | C
11 | 0 | 0 | 4 | 16 | 0 | 0 | N
12 | 0 | 0 | 4 | 17 | 0 | 0 | C
13 | 14 | 16 | 6 | 0 | 18 | 0 | u
14 | 0 | 0 | 13 | 20 | 0 | 0 | D
15 | 0 | 0 | 13 | 21 | 0 | 0 | T
16 | 0 | 0 | 13 | 22 | 0 | 0 | T
17 | 0 | 0 | 7 | 0 | 0 | 0 | N
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1 |        |DESCTEST            12 |        |PHONE
2 |        |EMPLOYEE_STRUC      13 |        |FIRST
3 |        |SBOOK-CUSTOMID      14 |        |LAST
4 |        |==ALPHA             15 |        |STREET
5 |        |NAME_STRUC          16 |        |ZIPCODE
6 |        |ID                  17 |        |PLACE
7 |        |NAME                18 |   *    |ABSENCE_TIME_ST
8 |        |ADDRESS             19 |        |RUC
9 |   *    |SALARY_PER_MONT     20 |        |DAY
10 |        |H                   21 |        |FROM
11 |        |ABSENT              22 |        |TO

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Hi Experts,
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Message was edited by:
kai

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Message was edited by:
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Attachments:
MODBUS LIB Counter.vi ‏39 KB

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