Write a method named printAverage that accepts
a Scanner for the console as a parameter and repeatedly
prompts the user for numbers. Once any number less than zero is typed,
the average of all non-negative numbers typed is displayed. Display the
average as a double, and do not round it. For example, a call to your
method might look like this:
Scanner console = new Scanner(System.in);
printAverage(console);
The following is one example log of execution for your method:
Type a number: 10
Type a number: 15
Type a number: -1
Average was 12.5
If the first number typed is negative, do not print an average.
