Encoding means nothing if you can’t decode, which is the task for this month’s Exercise: Transform the encoded hex bytes back into characters, unwinding the formula used to create them. The challenge isn’t really as much with coding the math as it is with translating hex bytes back into integer values — characters.
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The task for this month’s Exercise is to write an encoding filter that follows a specific pattern: After the first character (or byte) is output as a 2-digit hex value, the remaining characters are output as the difference between the previous character and the current character. I’m sure this type of encoding has an official name, but it’s the holidays and I’m too lazy to look it up.
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I hope you didn’t find this month’s Exercise too difficult. I do occasionally like to toss in an easy one. But for me, the big task was getting the output just right.
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The challenge for this month’s Exercise is to count in “alphabedecimal,” generating output from AAAA through ZZZZ, without using nested loops or a complex if structure. Your solution must use a recursive function that handles flipping the digits, er, characters.
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For this month’s Exercise, my solution to the scramble() function requires a second array. You could code a scramble() function without using a second array (or storage buffer), swapping individual characters within the string, but I chose not to.
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My ASCII table program had several iterations. It’s easy to get carried away, but it’s also easy to be too skimpy on the information. This month’s Exercise is based on my current ASCII program, which has evolved over the years.
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The challenge for this month’s Exercise is to determine the greatest price gain for a stock during the trading day. The gain is calculated moving forward in time, from a low to a high. It’s easy to see with human eyeballs looking at a chart, but not so easy when you must code a solution.
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Looks like your stock had a great day at the market. It bounced around, highs and lows, lots of nerves wracked and fingernails chewed, but the price ended higher on the day.
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I hope you enjoyed crafting your solution for this month’s Exercise. It’s just for fun, as I assume no one is going to mess with C to such a degree that their code becomes so completely unrecognizable. Still, C coders are a mischievous bunch.
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I hope you had a wee bit of a struggle with your solution to this month’s Exercise. It involves a lot of decisions and proper steps in the right order to hold off on debits so that the bank account never dips below zero.
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