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--- haas:spring2014:sysprog:projects:matrixmult3 [2013/12/25 11:01] – created wedge
+++ haas:spring2014:sysprog:projects:matrixmult3 [2014/02/20 13:44] (current) – wedge
@@ Line 1: / Line 1: @@
-======Matrix Multiplier Part II======
+======Matrix Multiplier Part II: Altering Program Behavior via Configuration======
-- read through getopt(3) manual page
-- compile, run, and figure out getopt.c example
-- implement both file output and getopt options in your matrix multiplier
-options to implement:
+=====Overview=====
----------------------
+One aspect of writing an effective application is flexibility- what are the expected behaviors of the program, and how can we enable the widest range of configuration changes without needing to recompile the code?
--h/-?/--help        display usage information (arguments)
--o file/--out file  specify output file for resultant matrix
+As far as run-time configuration goes, there are two options immediately available to us:
--m/--mirror         extra: options on 2nd matrix the same on 1st
--v/--verbose        display what is going on
+  * read settings from a configuration file
--q/--quiet          don't output anything
+  * specify settings via the command-line
--V/--version        display version information
--M #                matrix1's row count
+Now we get to explore the further implementation of these concepts.
--N #                matrix1's col count / matrix2's row count
--P #                matrix2's col count
+=====Command-Line Arguments=====
--1 file/--in1 file  specify input file for matrix1
+Many of you have likely encountered some aspects of accessing the command-line, typically through setting and using parameters in the **main()** function (via the venerable and oft-named **argc** and **argv** variables), but even then, we often kept things simple as the nature of parsing arguments can add complexity.
--2 file/--in2 file  specify input file for matrix2
+Luckily, functionality exists which does the bulk of the parsing work for us, so we will familiarized ourselves with that. It is known as **getopt()**, and it has a manual page. So:
+  * read through **getopt(3)** manual page (remember what the **3** indicates and how to make use of it?)
+  * compile, run, analyze, and figure out the code samples found in that manual page
+  * implement both file output and getopt options in your matrix multiplier
+===options to implement===
+  * -h/-?/--help        display usage information (arguments)
+  * -o file/--out file  specify output file for resultant matrix
+  * -m/--mirror         extra: options on 2nd matrix the same on 1st
+  * -v/--verbose        display more of what is going on
+  * -q/--quiet          don't output anything
+  * -V/--version        display version information
+  * -M #                matrix1's row count
+  * -N #                matrix1's col count / matrix2's row count
+  * -P #                matrix2's col count
+  * -1 file/--in1 file  specify input file for matrix1
+  * -2 file/--in2 file  specify input file for matrix2

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