Method name: positiveAverage

Parameter$($s$)$: an int array

Return value: the average of the positive items in the array as a double value

Example: positiveAverage$($new int$[]\{2,3,4\})$ should return $3\mathrm{.}0$

Note $1$: A positive integer is greater than zero.

Note $2$: You may assume that the array contains at least one positive integer, which avoids the need to check for a divide$-$by$-$zero error.