In C, a macro is a preprocessor directive that creates a shortcut, often a one-line expression to be inserted elsewhere in the code. Macros can make code more readable, but they can have a negative effect when implemented in a clumsy manner.
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The setlocale() function, mentioned in last week’s Lesson, both returns the current locale string and sets a new locale. It’s not necessary to call this function to gather locale details already known to your computer. To pluck out this detail, use the localeconv() function.
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A major hurdle in computer science was getting disparate computers to speak with each other. Not verbally, of course, but by exchanging files in compatible file formats. After this task was ironed out, professionals in white lab coats realized the next step was massaging program output to match the user’s language and other local preferences.
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The search path is a list of directories in which the operating system scans for programs. Its purpose is to allow quick access to common programs and system utilities without the necessity of typing a full pathname or changing to the right directory to start an application.
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In the printf() function, the first argument is a format string. It can contain the various percent placeholders to represent values expressed in the remaining arguments. But can one of those arguments also contain placeholders?
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It’s nuts. All through your C training when you learned about arrays, you were taught the format: array[x] where array is the name of the array and x is the element number. But this expression can also be written as x[array].
Mind. Blown.
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The tradition for successfully exiting a command line program is to use return 0; or, as I write it, return(0);. Zero is the OK value, meaning a program exited cleanly. Other values returned represent specific conditions, not necessarily errors, but information that can be communicated to the operating system or some other program.
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As a mid-level language, C has just as many positives as negatives with regards to accessing memory. One of the biggest negatives is C’s unflinching capability to access data that doesn’t exist.
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The C99 standard added a feature to dimension an array on-the-fly. The official term is variable length array or VLA. And while you might think everyone would love it, they don’t.
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The best way to declare a string literal in your code is to use array notation, like this:
char string[] = "I am some sort of interesting string.\n";
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