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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 m[];
    double v[];
 
    m[0] = 2.0e31;
    v[0] = 0.424e105;
 
    m[1] = 2.0e32;
    v[1] = 1.34e5;
 
    m[2] = 4.0e32;
    v[2] = 1.9e5;
 
    m[3] = 4.0e33;
    v[3] = v[2] * v[1] / v[0];
 
    System.out.println(v[3]);
 
    for(i=0;i<4;i++){
    m[i] = null;
    v[i] = null;
    }
	}
}

Main.java:29: error: cannot find symbol
    for(i=0;i<4;i++){
        ^
  symbol:   variable i
  location: class Ideone
Main.java:29: error: cannot find symbol
    for(i=0;i<4;i++){
            ^
  symbol:   variable i
  location: class Ideone
Main.java:29: error: cannot find symbol
    for(i=0;i<4;i++){
                ^
  symbol:   variable i
  location: class Ideone
Main.java:30: error: cannot find symbol
    m[i] = null;
      ^
  symbol:   variable i
  location: class Ideone
Main.java:30: error: incompatible types
    m[i] = null;
           ^
  required: double
  found:    <null>
Main.java:31: error: cannot find symbol
    v[i] = null;
      ^
  symbol:   variable i
  location: class Ideone
Main.java:31: error: incompatible types
    v[i] = null;
           ^
  required: double
  found:    <null>
7 errors

Standard output is empty