What’s today?
The reply could be the day of a week, such as Sunday. That’s how I first answer the question. The more detailed answer is the day of the month, which isn’t often on my mind — unless it’s an important day like a birthday or some event.
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I’ve wrapped up most of the oddities about structure/pointer/array notation in the past two Lessons (Part I and Part II). All that’s left is for me to go insane and start allocating structures as pointers with all their members as pointers.
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When it comes to structures and pointers, the structure-pointer notation is used only when the structure itself is allocated as a pointer (block of memory), not when a structure member is a pointer. Let me review from last week’s Lesson:
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Structures in C have their own issues when it comes to structure-pointers and structures within pointers. I wrote about this issue a few months back.
Another structure issue occurs with arrays within structures and arrays of structures. It also involves interesting notation — especially when you add pointers to the mix.
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A few weeks back, I wrote a post on the fflush() function, which immediately relieves an output buffer, releasing its contents. The mirror opposite of this function might be another output control function, setbuf().
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The challenge for this month’s Exercise is to fill a grid with random letters, a to z, then rotate that grid on its side, counterclockwise, and display the results. Such fun.
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It took me a while to figure out the significance of the nextafter() function. Though I understand what it does now, I still can’t figure out how it’s useful, though I assume it has a valid purpose otherwise it wouldn’t be in the standard library.
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I’m not immersed in higher mathematics, therefore most of my programming puzzles tend to involve strings or other items I can easily comprehend. Beyond manipulating characters and strings, for my programming kung fu training I keep returning to the matrix or grid.
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It’s been a while since I’ve been seriously concerned about wasting system resources. Back when I programmed a TRS-80 Model III with only 48K of RAM, keeping an eye on memory usage was vital. Today, not so much. In fact, if you desire to write code that consumes a lot of memory, CPU time, or other system resources, more power to you!
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Last year, I wrote about using the standard error device stderr to generate output that can’t be redirected. This technique is often used to send error messages to the console, though I noted how these messages may show up out of sync with standard output. This situation can be resolved, providing you know how to flush the stderr device buffer.
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