The solution to this month’s Exercise is similar to code I’ve presented in my books and in this blog with regards to randomly drawing from a fixed set of elements. Yet it has an extra level of complexity.
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The challenge for this month’s Exercise is to write code that counts repeating letters in a string. For example, the string “Hello, this is a test” repeats the letters T and S three times, letters E, H, I, and L twice, and the letters A and O appear only once.
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The puzzle for this month’s Exercise was to create and fill a 20-by-20 character grid with 20 asterisks placed at random positions, no two asterisks in the same spot. I hope you found this Exercise interesting, but not too easy.
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I’ve tackled the leap year program on this blog before. My Month Program series addressed the issue specifically. That code offers the february() function, which returns 28 or 29, depending on whether the current year is the leap year.
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Your task for this month’s Exercise is to take a timestamp string and move values from inside a string (characters) into a structure. It’s not an easy exercise, and it doesn’t have a single, best solution.
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Your task for this month’s Exercise is to code a text-processing routine that interprets the ^ character as a toggle for all-caps output. This challenge can be difficult, depending on how you interpret the toggle.
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The challenge for this month’s Exercise is to fill a cup without overflowing it. That cup is an unsigned char value, which goes only to 255 maximum. If your goal is increase the value of an unsigned char variable by 10 percent, any value over 255 - (255/10), or 220, must be set to 255.
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For my solution to this month’s Oscillation Exercise I created a toggle variable. This variable switches between 1 and -1. It sets the direction for the cascading values.
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This month’s Exercise involves swapping elements between two string arrays. A number of solutions exist (as always), but because the “strings” are really pointers, the solution can be very specific. Yes, you just might have to use that dratted ** notation. Brace yourselves.
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The two functions required from this month’s Exercise are show_arrays() and swap_arrays(). They’re not that difficult to code, meaning that you don’t need to use the dratted ** notation or perform any special tricks. Here’s how I solved the problem:
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