From last week’s Lesson, the clock_gettime() function returns values in both time_t (Unix Epoch) seconds as well as nanoseconds. This rich variety makes the function quite useful for coding time-critical details where values less than a second are desired.
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I tend to keep the lessons on this blog specific to the standard C library, C99 release. Yet every so often a newer function draws my attention, which may not be standard but can still be useful. Case in point is the clock_gettime() function, which subscriber M.Stumpfl mentioned in a previous post.
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I just moved to a new computer. The process involved taking all my personal programs and re-compiling them for the new system. It took a while, but fortunately everything works with my various programs doing their necessary jobs. That is, unless I see a weirdo error upon compiling one of those golden oldies. On such error I saw made me wonder what they heck I was doing in my code.
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The final update to the sconvert function includes translating characters &, <, and > for proper HTML output. With this update to the code from last week’s Lesson, the conversion filter is complete and can be used to translate C program text output into HTML code that I can easily post on the web.
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The task for last week’s Lesson was to convert tabs as well as spaces. The problem is that tab stops aren’t considered: On the terminal, a tab character generates a variable number of spaces based on where the next tab stop position is located. It isn’t a fixed value.
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As you can tell by the post title, part of the sconvert program I missed is to convert tab characters into HTML spaces. Like spaces, tabs output blanks that must be converted to the code for proper output on a web page.
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I’ve written two programs specifically for this blog. The first converts a C source code file into HTML. The second translates program output into HTML. Both of these programs are time-savers, helping me prepare and present the code and output without having to hand-code everything.
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The old days are gone, and with them the practice of using a for loop as a timing delay. Loops still do pause program execution, with the question being how long does it take a computer to wait for a loop?
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I learned to program on a microcomputer, a gizmo radically different in software and hardware design from today’s systems. An example of this difference is that if you wanted to write code that paused for a second, you wrote a for loop delay. Such a thing is obnoxiously impractical today — which sounds like a dare!
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Yet another fun way to mess with a matrix is to add its values to those in another matrix, creating a wonderful third matrix of the sums. Not everyone is going to agree that this notion is “fun.”
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