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Notes for Lecture 6 - January 31, 2008
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* Demo -- reading and processing files a line at a time
** 1-char
** 2-charbuf
** 3-charbuf
** 4-adder

* Functions
** definition:  gives code to run when function is called
** prototype: describes number and types of arguments and return type
** using module must have prototype in order to call the function
** defining module must have full definition
** prototype usually goes in a header file so it can be used multiple times
** call by value:  parameters are like local variables
** actual arguments are copied to parameters on call; return value is copied to caller
** void as parameter list means no parameters
** void as result means no return value
** empty parameter list in definition
***  is archaic -- means omit check for type compatibility
***  don't use in new code