[avgSequence.c] Question 4.10 pg. 151. (Chapter 4, need loops). Print the average, sum, as well as the number of integers entered.

(Average a Sequence of Integers) Write a program that calculates and prints the average of several integers. Assume the last value read with scanf is the sentinel 9999. A typical input sequence might be

10 8 11 7 9 9999

indicating that the average of all the values preceding 9999 is to be calculated.