I was a bit surprised the other day. I’d written code on my Macintosh and tried to run it on the PC. Because I usually write generic stuff, I figured that the code would compile and run on both systems. But it didn’t compile.
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Command line options often sport their own options or settings. For example, tab width might be set by specifying the tabwidth option followed by a value. No hard and fast rules exist for how such an option is set, but I’ve seen it happen in one of three ways:
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You may find my solution for this month’s Exercise to be more complex than necessary, but there’s a method to my madness.
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Your code must consider whether or not command line options are present, that the user may type the options in any order, and that some or all of the option could be incorrect. That makes for a lot of processing, but it’s also forgiving and users prefer the flexibility.
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I went bowling the other day. Actually, I went to watch people bowl. I’m a terrible bowler, having never rolled anything higher than 148 in my life. Breaking 100 is a rare occasion. But one thing I can do well is understand how the scoring works.
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When processing the main() function’s arguments, you must keep in mind the possibilities. Options are, after all, options. They might be there, they might not.
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About a year ago, I wrote a post on reading the command line arguments. It’s a process that takes place all the time, not only when running programs in a terminal window but also for graphical operating systems. Knowing how to manipulate command line arguments is important.
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I’ll confess that when I use a quicksort to sort and array of strings, I don’t use the C Library’s qsort() function. No, I write my own. The problem is that when sorting an array of strings, the qsort() function’s compar argument is a pain in the butt to craft properly.
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A chessboard is merely a two-dimensional array — a matrix — one where the rows and columns are the same size. As long as you can write code to output an 8-by-8 board, you can modify the code to reset the board’s size to any value.
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The quicksort deftly handles vast quantities of values. It can also sort strings, but that’s where things can get weird.
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