// Program to test solutions to problem #2 on the cse143 midterm, winter 2022.
// Note that it does not test whether the method throws proper exceptions.
// Fill in your solution to countDigit, then compile and run the program.

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

public class Test2 {
    public static int countDigit(int digit, int number) {
        // fill in your solution here
        // you can also rename the parameters above
    }

    // this is the sample solution
    public static int countDigit2(int digit, int number) {
        if (number < 0 || digit < 0 || digit >= 10) {
            throw new IllegalArgumentException();
        }
        if (number < 10) {
            if (number == digit) {
                return 1;
            } else {
                return 0;
            }
        } else if (number % 10 == digit) {
            return 1 + countDigit2(digit, number / 10);
        } else {
            return countDigit2(digit, number / 10);
        }
    }

    private static int testCount;
    private static int failCount;

    public static void main(String[] args) {
        test(3, 5323313);
        test(2, 2);
        test(0, 0);
        test(0, 304);
        test(7, 12345);
        test(5, 555);
        test(9, 919);
        test(0, 1234);
        test(5, 152535);
        test(7, 777777);
        test(4, 4);

        if (failCount == 0) {
            System.out.println("passed all " + testCount + " tests");
        } else {
            System.out.println("failed " + failCount + " of " + testCount + 
                               " tests");
        }
    }

    public static void test(int digit, int n) {
        testCount++;
        int result1 = countDigit2(digit, n);
        System.out.println("countDigit(" + digit + ", " + n + ") = " + result1);
        boolean fail = false;
        try {
            int result2 = countDigit(digit, n);
            if (result1 != result2) {
                fail = true;
                System.out.println("yours = " + result2);
            }
        } catch (RuntimeException e) {
            System.out.println("threw " + e);
            fail = true;
        }
        if (!fail) {
            System.out.println("passed");
        } else {
            failCount++;
            System.out.println("failed");
        }
        System.out.println();
    }
}