Lab 4 - Functions That Return a Value

For this lab, you will be expanding on the function example given in class. The example given in class computes the average for 3 doubles. You can find the source code here: example.cpp. To copy the example to your directory with the following command:

cp /home/fac/melissa/public_html/cs221-f09/example.cpp lab4.cpp

You will be expanding this code by adding a second function that will compute the standard deviation of the 3 doubles. The standard deviation is calculated using the following formula:

deviation = sqrt( ((num1 - avg)² + (num2 - avg)² + (num3 - avg)²) / 2)

where avg is the result of calling average(num1, num2, num3).

You will need to do the following tasks:

1. Create a function prototype for the standard deviation function and place the prototype above main().
2. Create the function body for standard deviation, which will perform the above calculation, below the function body for average.
3. Add a new cout in main() which will say "The standard deviation is " and then call your standard deviation function.