// Program to test solutions to problem #9 on the cse143x midterm, fall 2019.
// Fill in your solution to numWords, then compile and run the program.

import java.util.*;

public class Test9 {
    public static int numWords(String s) {
        // fill in your solution here
        // you can also rename the parameter above
    }

    // this is the sample solution
    public static int numWords2(String s) {
        int count = 0;
        boolean inWord = false;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == ' ') {
                inWord = false;
            } else if (!inWord) {
                count++;
                inWord = true;
            }
        }
        return count;
    }

    private static int count, failCount;
    private static Random r = new Random();
    private static int DISPLAY = 30;

    public static void main(String[] args) {
        testOne("how    many   words   here?");
        testOne("to be or not to be, that is the question");
        testOne("  how  about  merry-go-round     ");
        testOne(" !&$%--$$!!*()   foo_bar_baz   ");

        for (int i = 0; i <= 20; i++) {
            test(i);
        }

        if (failCount == 0) {
            System.out.println("passed all tests");
        } else {
            if (failCount > DISPLAY) {
                System.out.println("failed cases exeeds display max of " +
                                   DISPLAY);
                System.out.println();
            }
            System.out.println("failed " + failCount + " of " + count +
                               " tests");
        }
    }

    public static void testOne(String s) {
        count++;
        boolean display = failCount < DISPLAY;
        int answer = numWords2(s);
        try {
            int theirs = numWords(s);
            if (theirs != answer) {
                failCount++;
                if (display) {
                    System.out.println("FAIL (\"" + s + "\")");
                    System.out.println("correct = " + answer + ", yours = " +
                                       theirs);
                    System.out.println();
                }
            }
        } catch (RuntimeException e) {
            failCount++;
            if (display) {
                int line = e.getStackTrace()[1].getLineNumber();
                System.out.println("FAIL (\"" + s + "\")");
                System.out.println("threw " + e + " at line #" + line);
                System.out.println();
            }
        }
    }

    public static void test(int len) {
        test("", len);
    }

    public static void test(String s, int count) {
        if (count > 0) {
            test(s + character(), count - 1);
            test(s + " ", count - 1);
        } else {
            testOne(s);
        }
    }

    public static char character() {
        return (char) (r.nextInt(6) + 'x');
    }
}