Seven years ago (to this same date!) I wrote an Exercise to tally the digits in a number. The solution required that the sum be reduced to a single digit. For example, the sum of digits in 12345 is 15, which is then reduced to six.
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The power of an associative array is that it uses keys, text or numbers, to reference values. Know the key and you can fetch the value . This “association” works like an array in C, where you know the index or offset for an element. Though with an associative array, the index is a value or string — the key.
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The first phony associative array function I need to write is a simple dump: Output the array’s contents in the form of pairs. Performing this operation requires a bit of manipulation to the way the array is presented in the code.
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Being the ancient and venerable programming language it is, C lacks the associative array data type. This type of array is found in other languages, and it can be awkwardly simulated in C.
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I enjoy studying foreign languages. A tool like Google Translate comes in handy, but it’s not perfect. That’s because computers translate words and phrases, but not the living, spoken language. Regardless, I thought I’d give language translation a stab, which got me into the topic of exploring arrays.
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Last week’s Lesson explored using the clock_gettime() function to pause program execution for a given number of nanoseconds. The code, however, contains a flaw that may render an inaccurate result.
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I’ve written about my own delay() function, which uses processor clock ticks to calculate a time delay in milliseconds. Thanks to the clock_gettime() function, I can write a new time-delay function that operates from nanoseconds — or close to it. I hope.
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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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