I hope you didn’t find this month’s Exercise too daunting. In fact, it’s pretty basic stuff, but often something you might forget. In fact, the compiler may remind you when you attempt to pass an argument to a function and it’s of the wrong type.
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This month’s Exercise is to simulate turns in a game of tic-tac-toe (naughts and crosses). So the solution requires that you randomly work through available squares in the game matrix, alternating placement of an 'x' or 'o' token.
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Implementing a written algorithm is something you do frequently as a C language programmer. You’re given a set of directions and your job is to translate that English into computer code — and make that code work.
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To solve this month’s Exercise, you must create a function that tallies digits in an integer value, what’s known as a digit sum. The key issue is how to peel off individual values in an integer and then total the result.
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The C library contains various mathematical rounding functions, such as ceil(). That function, however, rounds up floating point values to the next integer. For this month’s Exercise, your job was to round up an integer to multiples of 16: 16, 32, 48, and 64.
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The purpose of the winner() function in the horse race game is to determine which value in an integer array is the largest. That would be an easy exercise to write, but it lacks the thrill and excitement of a horse race.
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One of the things I enjoy about coding defensive input is that I get to think about all the oddball possibilities. Users can type anything, which is something you must always anticipate. For typing in a percentage value, the door for whacky input is left wide open.
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This month’s Exercise is one of those old, programming warhorses: Calculate a depreciation schedule. At the simplest level, the solution is a mathematical loop and keeps subtracting a given percentage from a value.
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This month’s Exercise hosts a realm of possible solutions. So I present you with my three solutions, two of which are general and one specific.
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Writing an input routine isn’t that difficult in C. I cobble together simple input routines all the time. The scanf() function is brilliant for such situations. When you have to test input, things get dicey, which I hope you discovered as you attempted this month’s exercise.
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