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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double arr[];
		 arr=new double[3];
		arr=new double[3];
		for(int i=0;i<arr.length;i++)
		System.out.println(arr[i]);
		System.out.println("-------------");
		arr[0]=10.9;arr[1]=9.8;arr[2]=12.9;
		for(i=0;i<arr.length;i++)
		System.out.println(arr[i]);
	}
}

Main.java:19: error: cannot find symbol
		for(i=0;i<arr.length;i++)
		    ^
  symbol:   variable i
  location: class Ideone
Main.java:19: error: cannot find symbol
		for(i=0;i<arr.length;i++)
		        ^
  symbol:   variable i
  location: class Ideone
Main.java:19: error: cannot find symbol
		for(i=0;i<arr.length;i++)
		                     ^
  symbol:   variable i
  location: class Ideone
Main.java:20: error: cannot find symbol
		System.out.println(arr[i]);
		                       ^
  symbol:   variable i
  location: class Ideone
4 errors

Standard output is empty