 | fill the int array with random data |
 | display the contents of the array |
 | find and return largest value |
 | find and return smallest value |
 | find and return sum of all values in the array |
 | find and return the mean of all values in the array |
 | Count the number of int values in the array which are >= 90 |
 | If the array contains an 80, return the index number of the first
80 otherwise return a -1 |
 | sort the array |