CS174: OOP - Drills - Counting Array Zeroes

Developed by Professor Tralie and Professor Mongan.

Exercise Goals

The goals of this exercise are:
  1. To do proper array indexing
  2. To use loops in concert with arrays
  3. To use logic inside of a loop
  4. To declare accumulator variables outside of loops that are used in loops, but whose state persists beyond the loop
Modify the countZeroes method in ArrayZeroes.java file to count the number of zeroes in an array (this is based on exercise 13 on page 266 of the Horstmann book Java for Everyone).

Enter your Ursinus netid before clicking run. This is not your ID number or your email. For example, my netid is ctralie (non Ursinus students can simply enter their name to get this to run, but they won't get an e-mail record or any form of credit)

Netid
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ArrayZeroes.java

public class ArrayZeroes { public static int countZeroes(int[] arr) { /** TODO: Fill this in. You should return * an int representing the number of zeroes in the * array arr */ return 0; } }

Tester.java

public class Tester { public static void main(String[] args) { int[] arr0 = {}; int zeroes0 = ArrayZeroes.countZeroes(arr0); int[] arr1 = {0, 5, 10, 0, 3, 4}; int zeroes1 = ArrayZeroes.countZeroes(arr1); int[] arr2 = {0, 0, 1, 2, 4, 3, 4, 4, 0, 1, 2, 0, 3, 0, 0, 0, 2, 2, 4, 0}; int zeroes2 = ArrayZeroes.countZeroes(arr2); int[] arr3 = {3, 13, 12, 3, 20, 17, 10, 17, 6, 1, 19, 10, 15, 9, 9, 13, 11, 8, 17, 0, 2, 1, 4, 10, 20, 5, 14, 5, 20, 17, 14, 17, 16, 5, 17, 14, 1, 17, 10, 14, 20, 20, 8, 10, 9, 9, 20, 8, 14, 4, 13, 9, 3, 11, 2, 8, 12, 1, 13, 9, 13, 1, 9, 14, 16, 15, 0, 9, 3, 5, 17, 2, 0, 12, 8, 7, 13, 15, 14, 7, 10, 11, 18, 19, 14, 20, 10, 2, 3, 10, 20, 3, 19, 8, 14, 11, 11, 5, 5, 0}; int zeroes3 = ArrayZeroes.countZeroes(arr3); System.out.print(zeroes0 + "." + zeroes1 + "." + zeroes2 + "." + zeroes3); } }
Tester.main(null);

Output