Q$1$: Can you find the faults in the following three programs? Please provide a test input that can help

you identify each fault.

Q$2$: For each program, can you find a test that does NOT lead to failures?

$/*$ok

Find last index of element

$\frac{?}{?}****$

Counts zeroes in an array

Cparam $x$ array to count zeroes in

areturn number of occurrences of $0$ in $x$

athrows NullPointerException if $x$ is null

$*\frac{*}{?}$

public static int numZero $($int $[]$ x$)$

$\{$

int count $=0$;

for $($int $i++(x[i]==0)xxyi=xi>0i--(x[i]==y)x$;$-1$xxi$=0i++(x[i]==0)i.$ length; $i++1=1$;$i.$ length; $i++$