How to find number of decimal places?

[Ajith George]

How can i find number of decimal places in a double value.
example number of decimal places in 0.0005.

Thanks in advance.

[Keith Lynn]

You could convert it to a String, find the index of the . and then find the difference between that index and the length of the String.

[Ajith George]

But the double number passed in to the method is automatically converted in to the format 5.0E-6 for .000005 . So that idea is not working. Any other suggstions, please help.

[Keith Lynn]

Well if it's in scientific notation, you should be able to use the exponent to figure out the number of decimal places.

[Ajith George]

But how can i use this exponebt number. itried the following code

  
        char theChar = strNumber.charAt(stringLength-1); 
   
       
       numberOfDecimals=(int)theChar;  

But some garbage value too is coming with variable theChar.
What should i do?

[Keith Lynn]

Here is a way to start if you have the number in scientific notation.

import java.math.*;
 
public class Test14 {
 
   public static void main(String[] args) {
       double d = 5.0E-6;
 
       String string = String.valueOf(d);
 
       String[] tokens = string.split("[+-]");
 
       int decimalPlaces = 0;
 
       if (string.contains("-"))
          decimalPlaces = new Integer(tokens[1]);
 
       System.out.println(decimalPlaces);         
   }
 
}