Lab: Function Practice

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1. Write a function that requests ten integers from the user and prints their average
   soln
2. Write a function that requests ten integers from the user and returns their average
   soln
3. Write a function that prompts the user to enter two positive integers and returns their greatest common divisor. The greatest common divisor of 16 and 24 is 8.
   If two numbers (num1 and num2) are entered, check integers from 1 up through the lower of num1 and num2 to see if the integer divides evenly into both num1 and num2. Note, 1 is a common divisor of all numbers
4. Modify the above function so that the main program prompts the user for the integers and calls the function with those integers.
5. Modify the GCD function to return a void and use a reference parameter for the answer
6. Move all functions to after the main and write function prototypes