format a scientific notation double to a non scientific notation double

[Lisa Zapson]

I'm trying to format a double in scientific notation to a double not in scientific notation. I tried using DecimalFormat to format the scientific notation double to a string. But, when I try to convert it back to a double I get the scientific notation back.

7.399999999999985E-5 To 0.00007 (When I create a new Double I get 7.0E-5 back).

Any suggestions would be greatly appreciated.

Thanks, Lisa

[Karan Rajan]

Lisa,

What did you try ? What was your output ?

Here's what I tried :

    
                double d = Double.parseDouble("7.399999999999985E-5");
NumberFormat formatter = new DecimalFormat("###.#####");
 
String f = formatter.format(d);
System.out.println(f);// output --> 0.00007

Take a look at the documentation and other examples on how to use the 'pattern' to suit your needs.
[ January 17, 2007: Message edited by: Karan Rajan ]

[Lisa Zapson]

Hi Karan,

I was also able to get a string of 0.00007. I now want to convert that string back into a double. I tried Double.valueOf(), Double.parseDouble() and New Double(). For each of these I get 7.0E-5.

Thanks, Lisa

[Jim Yingst]

The double itself has no concept of whether it's using scientific notation or not. That is only relevant when you try to convert it to a String. If you have two doubles:

double d1 = 0.00007;
double d2 = 7.0E-5

These are exactly equal in all ways. There is no difference at all. What you're asking for is impossible. If you want to convert either of these to a string that doesn't use scientific notation, you need to use the DecimalFormat, or similar methods. (JDK 5 has other methods which can help, e.g. String.format().)

[Lisa Zapson]

I appreciate you subtlety, I couldn�t agree more! I will rethink what I�m trying to do.

Thanks, Lisa

[fred rosenberger]

If you can tell us exactly what you are trying to do, we can help. the more detail the better (within certain limits). code samples also help!!!

[Alex Pri]

Well.
Got the same problem - get rid of scientific notation.
But I don't want to lose any data, and I don't know in advance how many digits will it be.

The only solution I see right now:

double ldouble = 0.0000750;
 
System.out.println((new BigDecimal(Double.toString(ldouble))).toPlainString());

If you can point me out how to get exactly 0.000075 with NumberFormat, please, do.

[Martijn Verburg]

Hi Alex,

Please post your question in a new thread, we try not to WakeTheZombies