import java.io.* ;
public class life42  {
	private static BufferedReader stdin = new BufferedReader (
	new InputStreamReader ( System.in) ) ;
	
public static void main (String[] args) {
		
	System.out.println( "Enter a number") ;
	 String input = stdin.readLine();
	
	int a = Integer.parseInt ( input) ;
	
	if ((a !<= 0 || a !>= 0)) {
	System.out.println("Maybe if you enter a number..") ;}
		
		while ( a <= 0 || a >= 0) {
			
			System.out.println ("Input a number") ;
			input = stdin.readLine();
			a = Integer.parseInt(input) ;
			System.out.println(a) ; 
			}


			if (a == 42) {
System.exit;
	}
}

}

// This looks incorrect
((a !<= 0 || a !>= 0)) 
// Try this instead
(!(a <= 0) || !(a >= 0))

import java.io.*;

public class Life42 {
    public static void main(String[] args) {
        BufferedReader stdIn = new BufferedReader(
            new InputStreamReader(System.in));

        String input;
        int a;

        while (true) {
            try {
                System.out.print("Input a number: ");
                
                input = stdIn.readLine(); // throws IOException on failure
                a = Integer.parseInt(input); // throws NumberFormatException on failure
                
                System.out.println(a);
                
                if (a == 42)
                    System.exit(0);
                
            } catch (NumberFormatException e) {
                System.out.println("Maybe if you enter a number...");
            } catch (IOException e) {
                System.err.println("There was a problem reading your input.");
            }
        }
        
    }
}