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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
	{
		System.out.println(i + "! =" + n);
	}
 
	public static int factorial(int n){
	int i = n;
	if (n <= 1) {
		return 1;
	}
	else {
		return n * factorial(n - 1);
	}
}
 
}

Main.java:12: error: cannot find symbol
		System.out.println(i + "! =" + n);
		                   ^
  symbol:   variable i
  location: class Ideone
Main.java:12: error: cannot find symbol
		System.out.println(i + "! =" + n);
		                               ^
  symbol:   variable n
  location: class Ideone
2 errors

Standard output is empty