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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
	{
		// your code goes here
		a =1;
		b=2;
		a=b;
		c=a;
	}
}

Main.java:13: error: cannot find symbol
		a =1;
		^
  symbol:   variable a
  location: class Ideone
Main.java:14: error: cannot find symbol
		b=2;
		^
  symbol:   variable b
  location: class Ideone
Main.java:15: error: cannot find symbol
		a=b;
		^
  symbol:   variable a
  location: class Ideone
Main.java:15: error: cannot find symbol
		a=b;
		  ^
  symbol:   variable b
  location: class Ideone
Main.java:16: error: cannot find symbol
		c=a;
		^
  symbol:   variable c
  location: class Ideone
Main.java:16: error: cannot find symbol
		c=a;
		  ^
  symbol:   variable a
  location: class Ideone
6 errors

Standard output is empty