In your fancy, new game, the program dutifully track players and their scores. When the game is over, or at the end of a round, the players not only want to know their scores, but where each sits in the overall ranking. That process takes a bit more coding than just spitting out the scores.
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At the lowest programming level, you encounter machine code. This is the language of the processor itself. Machine code directs the processor to do things, such as read from or write to memory, store data, perform math, and other tasks. And if you dare to program a processor directly, you’ll encounter something called the stack pointer register.
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One of those weirdo programming concepts university sophomore programming students eagerly avoid is the stack. It’s a type of storage with unique features, but it’s difficult to appreciate unless you understand its origins.
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Seriously, why do programmers need an abs() function? It’s available in just about every programming language; if you view an alphabetic list of functions, abs() is probably the first one. Yet, what’s the point of a function that simply converts negative values to positive values?
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For my solution to this month’s Exercise, I crafted the ask() function. That’s because the original code prompts three times with a question string and an answer buffer, which is the repetitive part of the program I chose to cast into a function.
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Somewhere in my vast array of teaching material, I claimed that only for loops can be nested. That’s poppycock.
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I believe two reasons exist for creating functions. The first is repetition; when you have a chunk of code that duplicates several times, it’s best to shove it off into a function where it can be called repeatedly. The second reason is readability.
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I’m not a fan of the scanf() function, despite how handy it can be. It’s a great teaching tool, but for a program that accepts string input, you need to use fgets() instead. Still, scanf() can be used to read a string, providing that you know the whitespace requirements beforehand.
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I received a question on a looping variable and why its value after the loop isn’t the same as the ending value of the loop. It’s a puzzling issue I remember from when I first learned to program, but one that you can understand once you figure out what the loop does.
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To add more functionality to the C language, you mix in another library. The library contains routines (functions) that let you control specific hardware, manipulate data, work with graphics, and a host of other capabilities beyond the standard C library.
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