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File: average.c

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Author: Sandy Beach
Class: Boston University CAS CS 113
Assignment: 1.17 (exercise 99 on page 789 of KP)
Due Date: February 30, 1996

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Usage: average a b

Inputs: two floating point numbers "a" and "b"

Outputs: floating point average of "a" and "b" to standard output

Description: 

 This is a program that computes the average of two numbers.

Algorithm: 

        average = (a + b)/2

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Errors: 

 1. User fails to enter two numbers. 

   Error message: "Usage: average <a> <b>\n"
   Error action: Program exits without computing average

 2. User enters more than two numbers.  

   Error message: "User entered more than two numbers.\n"  
                   Computing average for first two numbers only\n" 
   Error action: Program prints average of first two numbers.

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Other Comments:  

 This routine could be enhanced so that it could take any quantity of
 numbers.  This could be done by first inspecting the argument count
 "argc" passed into the main() routine.

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