package edu.wit.cs.comp1000;
import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;
import java.io.FileNotFoundException;

//TODO: document this class
public class PA8a {

	/**
	 * Error to output when a file cannot be opened.
	 */
	static final String E_NOT_FOUND = "Error! File not found!";

	/**
	 * Reads all integers in input scanner,
	 * outputs positive ones to output each on
	 * its own line
	 *
	 * @param input input source
	 * @param output output destination
	 */
	public static void process(Scanner input, PrintWriter output) {
		String unSplitVal = "";

		while(input.hasNext())
		{
			unSplitVal = input.next();
			String[] splitVal = unSplitVal.split(" ");
			for(int i = 0;i<splitVal.length;i++)
			{
				if(splitVal[i].charAt(0) == '-')
				{

				}
				else
				output.println(splitVal[i]);
			}
		}

		// TODO: write your code here
	}

	/**
	 * Program execution point:
	 * input an input file name and an output file name,
	 * for each positive number in the input file
	 * print on its own line to the output file
	 *
	 * @param args command-line arguments (ignored)
	 */
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		System.out.printf("Enter the name of the input file: ");
		String inputName = s.next();
		System.out.printf("Enter the name of the output file: ");
		String outputName = s.next();
		/**
		 * it attempts to make a scanner with the inputName, and then it attempts
		 * to make a printWriter with the output to test if they both exist.
		 * if successful it does what is inside of the brackets of the try statement
		 */
		try(Scanner fin = new Scanner(new File(inputName));
			PrintWriter fout = new PrintWriter(new File(outputName));
		){
			process(fin,fout);

		}
		catch(FileNotFoundException ex)
		{
			System.out.printf("%s%n", E_NOT_FOUND);
			System.exit(0);
		}
		// TODO: write your code here
	}

}