My solution for this month’s Exercise didn’t require much work. What I did was to “stack overflow” the problem by pulling in functions from earlier Lessons. The only new portion of code deals with processing the input before sending the string off to the b36_decimal() function I’ve already written.
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Rolling seven dice over and over is how I passed time “playing” D&D. But I also played a game with the dice, one that I introduced in last week’s Lesson. That lesson’s code got things started. This Lesson finishes the project.
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Last month, I completed my series on Base 36, which uses digits 0 through 9 and A through Z to represent values. The use of these digits means that common words can represent values in base 36. In fact, your name is a base 36 value. But what is it?
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You would think that I’d be deeply into Dungeons and Dragons, but no. I can’t stand the game. I find it tedious and predictable, boring. But I did enjoy rolling all those dice. Who knew that a 20-side die is a thing — and that rolling a “nat 20” is a big deal?
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Continuing my Base 36 series, from last week’s Lesson, the base35_string() function successfully converts a decimal value into its base 36 representation. To verify that the conversion works, another function is necessary to convert base 36 strings into their decimal equivalents.
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The next step in my Base 36 series is to translate a decimal value into its base 36 representation. In last week’s Lesson, code was presented to build a powers table and slice a decimal value into its base 36 components. This Lesson completes the task with a function, base36_sting() to build and output a base 36 value.
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This month’s Exercise presents more than a traditional filter. Instead of input being processed and immediately output, the input must be stored. Further, the storage quantity is unknown. Therefore, to provide proper storage the code must employ an expanding buffer. This condition means that the solution relies upon the scariest aspect of C programming: pointers!
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To build a number in base 36, you need to know the powers of base 36. This information is required to output digits — 0 through 9 and then A through Z — in the proper order to represent a base 36 value. This task may seem complicated, but it’s the same process that takes place for any counting base.
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Filters are fun to code and useful, such as the more filter in Linux that pages text output. For this month’s Exercise, your task is to write a text reversing filter. This program is a bit more challenging than coding other types of filters.
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This month’s Exercise output values in various bases, but only those bases from 2 to 10. For other bases, especially those that alien beings might use, more effort is required. Therefore, I’d like to begin exploring a ridiculous counting base, base 36.
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