// Program to test solutions to problem #2 on the cse143 midterm, spring 2012.
// Fill in your solution to printDashed, then compile and run the program.
// Note: if you generate infinite recursion, it might leave behind a temporary
//       file on your directory.  You can delete this file.

import java.util.*;
import java.io.*;

public class Test2 {
    public static void printDashed(int n) {
        // fill in your solution here
        // you can also rename the parameter above
    }

    // this is the sample solution
    public static void printDashed2(int n) {
        if (n < 0) {
            System.out.print("-");
            printDashed2(-n);
        } else if (n < 10) {
            System.out.print(n);
        } else {
            printDashed2(n / 10);
            System.out.print("-" + n % 10);
        }
    }

    public static final String END_TEST_TEXT = "end test";
    public static final String TEMP_FILE_NAME = 
        "CSE143_Test2_temporary_file.txt";

    public static void main(String[] args) throws FileNotFoundException {
        // create an output file with correct answers and student answers
        File temp = new File(TEMP_FILE_NAME);
        PrintStream out = new PrintStream(temp);
        PrintStream old = System.out;
        System.setOut(out);
        int[] data = {-1234567, -834, -17, -4, 0, 6, 42, 983, 29348, 1234567};
        for (int n : data) {
            System.out.println(n);
            try {
                printDashed2(n);
                System.out.println();
            } catch (Exception e) {
                System.out.println("threw " + e.getClass());
            }
            try {
                printDashed(n);
                System.out.println();
            } catch (Exception e) {
                System.out.println("threw " + e.getClass());
            }
            System.out.println(END_TEST_TEXT);
        }
        System.out.close();

        // go through the file to compare pairs of answers
        System.setOut(old);
        Scanner input = new Scanner(temp);
        while (input.hasNextLine()) {
            int n = Integer.parseInt(input.nextLine());
            String correct = input.nextLine() + "\n";
            String yours = "";
            for (;;) {
                String line = input.nextLine();
                if (line.equals(END_TEST_TEXT))
                    break;
                yours += line + "\n";
            }
            System.out.println("Testing with n = " + n);
            System.out.println("Correct output:");
            System.out.print(correct);
            if (correct.equals(yours)) {
                System.out.println("passed");
            } else {
                System.out.println("Your output:");
                System.out.print(yours);
                System.out.println("failed");
            }
            System.out.println();
        }

        // remove the temporary file
        input.close();
        temp.delete();
    }
}