Please kindly help find faults in the program below and also provide test input that can help to identify each fault.

Which of this programs also does not lead to failures

/** * Counts zeroes in an array * * @param array to count zeroes in * @return number of occurrences of 0 in x * @throws NullPointerException if x is null */ public static int numZero (int[] x) { int count = 0; for (int i = 1; i 0; i--) { if (x[i] == y) { return i; } } return -1; } /*** * Find LAST index of zero *