Convert Double to double

How can I convert Double to double???

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Convert String to double with two digits

How can I format "String" type of numbers (eg. 199.0, or 199) to return a "double" type of nubmers like 199.00, or 199.00. It should have two digits.
For example, the input is String of 199.0, how can I get "double" 199.00. Always format as two digits.
Thanks for your help,

Thanks for replying.
Here is my code. For some reason, when convert the returned String back to double in main, it cut the "0".
What's wrong with my code? How can I get that 4.60 in double type.
Thanks again,
==================================================================================
import java.text.*;
import java.util.*;
import java.sql.*;
public class NumUtils
// Convert Double to 99.99
public static String format(String str)
//double d = 4.6;
double d = Double.parseDouble(str);
NumberFormat formatter = new DecimalFormat("0.00");
formatter.setMaximumFractionDigits(2);
String s = formatter.format(d);
return s;
public static void main(String[] args)
String myDouble = "4.6";
String mynewdouble = format(myDouble);
System.out.println(" --- formatDouble = " + mynewdouble);
double my_d = Double.parseDouble(mynewdouble);
System.out.println(" --- Double = " + my_d);

How to convert BigDecimal to double

Error Message: {http://xmlns.oracle.com/OracleRules1/OracleRules1_DecisionService_1}operationErroredFault
Fault ID default/BusinessRule2!1.0*b48a0c26-0b59-41e0-8939-55c7589d76f1/BusinessRule2_BPELProcess/10004-BpInv0-BpSeq2.9-4
Fault Time Jan 15, 2010 11:52:33 AM
Non Recoverable System Fault :
<bpelFault><faultType> <message>0</message></faultType><operationErroredFault xmlns="http://xmlns.oracle.com/OracleRules1/OracleRules1_DecisionService_1"><part name="payload"><errorInfo xmlns="http://xmlns.oracle.com/OracleRules1/OracleRules1_DecisionService_1"><errorMessage>cannot convert from type 'java.math.BigDecimal' to type 'double' at line 5 column 9 in main</errorMessage></errorInfo></part></operationErroredFault></bpelFault

>
> how to convert bigdecimal to double in webdynpro java
Hi,
Try this:
double x = wdContext.currentContextElement().getBigdecimalAttribute().doubleValue();
Refer methods applicable on Bigdecimal here -
http://code.google.com/android/reference/java/math/BigDecimal.html
Regards,
Anagha
Edited by: Anagha Jawalekar on Nov 17, 2008 12:08 PM

Cannot explicit convert double.MaxValue/double.MinValue/float.MaxValue/float.MinValue to decimal

I'm try set double.MaxValue/double.MinValue/float.MaxValue/float.MinValue to NumericUpDown's Maximun/Minimum
It fail (compile error)
but variable and constant's explicit conversion is OK.
can anyone tell me why?
the screenshot is in below
http://i.imgur.com/woZXr0i.png

yes, your right!
I has been tried
If I assign it(MinValue/MaxValue) to a variable first and then explicit convert to a decimal
it will be pass compile, but it will throw exception when runtime
screenshot
http://i.imgur.com/TpD8guJ.png

Which is better in performance Double + "" or Double.toString() ?

Can anyone let me know which of these will be performance effective for converting a Double to String:
1. Double + ""
2. Double.toString() ?

ejp wrote:
Double+"" calls String.valueOf(double) and then appends "" so it can't possibly be faster.Actually the append/+ uses a StringBuilder which costs almost a micro-second more. (Actually its about 0.3 us on my machine)
Both methods call Double.toString(double) which is what I would use except ""+d is faster to type. ;)
Edited by: Peter__Lawrey on 25-Jul-2009 07:57

Invalid operands to binary ^ (have 'double' and 'double')

Hi all,
I've been trying to make some calculus like
double a, b, c;
b = 0.3;
c =0.35;
a = b^c;
but I get this error message: *"Invalid operands to binary ^ (have 'double' and 'double')"*. Does anybody know how to solve this?
Thanks in advance!

Yes I think Ray hit the nail on the head. It looks as if you wanted to perform and exponentiation operation, not a bitwise operation. So, just to expand on Ray's answer a bit, the carrot symbol (^) that you used in your statement is, in C, the bitwise XOR operator, and has nothing to do with exponentiation. There are numerous bitwise operators in C (bitwise AND (&), bitwise OR (|), bitwise XOR (^)), and they all deal with manipulating bits of data. If you were, in fact, trying to raising b to the power of c and assign that value back to a, then Ray's post was the perfect answer as to how to do that.
Many programmers that are new to C, especially ones coming from a language such as Visual Basic, where the carrot symbol is used for exponentiation operations, naturally try to use the same symbol for the same purpose in C, and are surprised to find that it doesn't do what they expected (understandably). As mentioned, this is because, in C, there is no exponentiation operator, and the carrot symbol does something completely different and unrelated to exponentiation. However, C does provide a predefined function in its standard library for exponentiation, and it is called the pow() function, which takes two double-typed arguments (the first is the number being risen and the second is the power that it is being raised to), and returns the result as a double. To use this function, all you have to do is write an include directive at the top of the file that you will be using the function in that tells the preprocessor to include the file math.h. See RayNewb's post for a solid example of how all this stuff would look in your source code, and, as he mentioned, open your Terminal and type in +man math+ or, for this particular function, +man pow+ to find out more about how this function works (you can page through the information with the spacebar or scroll down with the down arrow).
Hope this was of some help for you, and best of luck with everything!

SSAS 2005 Error converting numeric to double

Hello,
im getting error: "Errors in the back-end database access module. OLE DB was unable to convert a value to the data type requested for column 0.", "Errors in the OLAP storage engine: An error occurred while the 'Unit Price' attribute of the 'Dim Work' dimension from the 'S1_DWH' database was being processed." This error rises when OLAP tries to convert numeric(18,6) to double with value less than 1 and bigger than -1. Same problem with measures with these values. With any other values cube and dimensions works well. This error occured on production server. On dev server works well without any errors.
Any ideas?

Hi,
This issue could be caused by the data difference between dev DW and product DW. Could you check if there is unexpected null value in database? Also, if you are using named query, could you run the query on product server for test?
Here are two similar threads:
http://social.msdn.microsoft.com/forums/en-US/sqlanalysisservices/thread/1c06a7a6-9885-4756-a055-50b83b25029e/
http://social.msdn.microsoft.com/Forums/en-US/sqlanalysisservices/thread/74d4a3d4-72fe-46fb-b3a0-a8bab7ac643f
Hope this helps.
Raymond

Converting from a double to scientific notation

does anyone know how I can convert a double value to scientific notation?

java.text.DecimalFormat can do that.

Converting from Int/Double to Wording Format

Hi,
Does anyone has any sample program to convert double values into wording (this functionality is used to convert currency value) up to Trillion value.
For eg: 1000.90 One thousand And Ninety Cents
I have written a program which can accept up to 1 Billion. This is because that 'int' can accept bits up to that level only. I am unsure how go beyond that because when I declare the type to double, the compiler gave me the same error.
Thank you.

Check
http://www.rgagnon.com/javadetails/java-0426.html
but consider keeping locale specific texts in properties
file and access them through resource bundles.

Need to know the best practice for converting string to double

I have a string and want to convert to double if it is a valid number, else want to keep as it is. There can be couple of ways doing it and I want to know which one is best if I have lots of strings, specially from performance point of view.
1) Use Double.parseDouble(myString) and catching Number format exception to detect it is not a number. One of my colleague said it does not give good performance because of exception catching,
2) Use of org.apache.commons.lang.math.NumberUtils.isNumber() and if it is true then only parse it - so don't rely on exception.
I did some performance testing - putting it in a loop and trying out for 2 scenarios - one loop for proper numeric value string and another for non-numeric. What I found out was if strings are not proper then parseDouble() is taking long time (because of exception catching) and in that case using NumberUtils.isNumber() makes sense.
Would like to hear expert views on this.
Thanks
Manisha

If you need it as a double you must convert it to a double and catch the exception. This means that testing it first is a waste of time in the case when the test succeeds - did your colleague think of that?
Catching the exception is possibly slower than the test. Whether this is significant depends on the relative timings of the test and catching the exception, and also on the expected error rate. If this is below about 40% I suggest your colleague is talking through his esteemed hat.
And of course the best test by far is the conversion itself. Using any other test runs the risk of its rules being different from those applied by the conversion.
In any case you are obliged to write the code that catches the exception. You're not obliged to write the pre-test code.
My personal rule for efficiency is to minimize lines of code until hard evidence to the contrary proves that further improvement is required.

Converting StringBuffer to double

Hi all,
The only I could find converting a StringBuffer object to a double is through converting it first to a String with toString and then parsing it with parseDouble(). Is there a way to do it without doing toString() in the middle?
Thanks a bunch.
class MyStringBuffer{
public static void main(String args[]){
StringBuffer firstOperand=new StringBuffer(35);
firstOperand.append("123.");
firstOperand.append("06");
String result=firstOperand.toString();
System.out.println(Double.parseDouble(result));

Hi Mr.Matthew!
Consider some hints:
1) StringBuffer is the most efficient way to manipulate strings, none is better unless always a pair of strings (numeric representation) are to be used and few times
2) Double.parseDouble() is also efficient because it is a static method, it doesn't create a Double instance!
3) Sun implemented both classes after intensive research, so there aren't bugs to fix, they are closer to optimal solution.
I understand you are intended to maximum efficiency but sometimes it doesn't be reached at low operational cost.
Success!

Converting String into double

Hi,
I want to convert 30.10 String Value into double.
I need to get the value as 30.10 as double only.
I tried but I am getting 30.1 only.
Please suggest me.
Thanks in advance..

user13797408 wrote:
Hi,
I want to convert 30.10 String Value into double.
I need to get the value as 30.10 as double only.
I tried but I am getting 30.1 only.
Please suggest me.
Thanks in advance..Don't do it. A short read of the documentation will tell you why (and why several such methods in many similar Java classes have been deprecated).
Simply said: 30.1 has no exact representation as a double; and it's quite possible that "30.10" will yield a different value from "30.1" (but hopefully not).
As far as printing out is concerned, you should check out NumberFormat or String.format(...). You are trying to convert a number stored in binary, that you already converted from a decimal numer (30.1) back to decimal. Sound like overkill to you?
PS: Have a look at BigDecimal. I think it may do what you want.
Winston

Converting array of Double Precision values to U16 for MODBUS

Hello,
I am trying to send over pressure and temperature information via the Input Register array in MODBUS TCP. My question is, how to I properly send over an array of double precision values without loosing my data?
For example, my array of data looks like:
12.0001
32.001
0.00051234
0.0014838
1.02
12.0232
31.920
Thanks so much.

Thank you Ravens Fan for replying.
I missed one extra point of data. Below is what I'd like to send:
12.0001
32.001
0.00051234
0.0014838
1.02
12.0232
31.920
2046
The array above is an array of double precision values. I will convert that array to an array of single precision floating data to reduce data size.
Since I have eight pieces of single precision floating point data now, I will need to write to 16 registers correct? What is the best method to split up each piece of data into two consecutive registers?
Attached is a Slave Send Data.VI that I want to send this data through. The end goal is to have a Master PC (not using labview, but a MODBUS utility) to read my MODBUS TCP message from the "Slave Send Data.vi"
Thanks
Attachments:
Slave Send Data.vi ‏15 KB

Error in converting double to double array

Iam getting a problem while coverting the values of a table to double array local variable . while the values r getting from the resultset using while(rs.next())
all the values have to store in the double array.please give me solution to this problem.

Show us your code and the problem you are facing.

Help needed (converting string to double)

keep getting an error someone give me a hint
public class q1d
    public static void main(String [] args)
        String whats;
        double x;
        x = (String)whats;
        System.out.println(+x);
}

Then study this tutorial
http://java.sun.com/docs/books/tutorial/
Specifically, this part
http://java.sun.com/docs/books/tutorial/java/data/index.html
You need some basic knowledge. These forums are not suitable for teaching Java. The tutorial is.

Convert Double to double

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