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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
	{
		String A="";
		N = 7;
		while (N>0){
			A += N%2 + A;
			N = N/2;
		}
		System.out.print(A);
	}
}

Main.java:13: error: cannot find symbol
		N = 7;
		^
  symbol:   variable N
  location: class Ideone
Main.java:14: error: cannot find symbol
		while (N>0){
		       ^
  symbol:   variable N
  location: class Ideone
Main.java:15: error: cannot find symbol
			A += N%2 + A;
			     ^
  symbol:   variable N
  location: class Ideone
Main.java:16: error: cannot find symbol
			N = N/2;
			^
  symbol:   variable N
  location: class Ideone
Main.java:16: error: cannot find symbol
			N = N/2;
			    ^
  symbol:   variable N
  location: class Ideone
5 errors

Standard output is empty