Expressions Exercises: Part A

Create a class called AverageCalculator that:

- defines and initializes three numeric variables, use values of your choice
(choose appropriate variable names and data types)
- calculates the average of the three numbers and stores the result in a
variable (choose an appropriate name and type)
- displays the average
When you run your program, use a calculator to make sure you 
have the right answer.

Test Data:
Value 1     Value 2     Value 3     Average
  3             7           2           4
  12            9           4           8.333333
  6.1           4.9         1.12         4.04



HINT 1 - To figure out the average of a bunch of numbers, we have to 
add them all up and then divide them by how many numbers we added
HINT 2 - Remember order of precedence