@param arr the array we're getting data from.

$*$ @param n the index $($number$)$ of the element we're looking to modify.

$*$ Indexes in arrays start counting from zero.

$*$ @param val the value that we will assign to a spot in the array.

$*$ @return nothing. Because of pass$-$by$-$reference, any change to the array will be reflected across our java program.

$*/$

public void setNthElementOfArray$($int$[]$ arr, int n$,$ int val$)\{$

$\}$

$/**$

$*$ @param n the size of the array we wish to create

$*$ @return a new int array that can contain n elements.

$*/$

public int$[]$ returnNewArraySizeN$($int n$)\{$

return null;

$\}$