Write some code that requests for and reads a set of positive integer values until the user enters a sentinel value and then computes the average of the numbers entered. Make sure that your code cannot produce a division by zero error. You may assume that the scanner class has already been imported but you should declare/instantiate any necessary variables.

Hint: A sentinel value is a value that is outside the normal range of values to be entered that the user enters to signify end of input.