I almost believe these two functions to be useless, but they do play an important role in the ctype pantheon: isascii() determines whether an integer value is an ASCII character, and iscntrl() lets the program know further whether an integer value is also an ASCII control code. This pair adds to my continuing exploration of the ctype functions.
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You can draw a blank and you can get spaced out, so there’s a difference in the English language between the words “space” and “blank.” This difference doesn’t explain how the ctype functions isblank() and isspace() work. In this Lesson, I cover these two functions and their differences, as I continue my exploration of the ctype functions.
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Two very similar ctype functions are isgraph() and isprint(). Only one character separates the two functions. And the isgraph() function has nothing to do with graphics. These are the topics for this week’s Lesson as I continue my exploration of the ctype functions.
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The ctype functions isalnum(), isalpha(), and isdigit() examine the alphanumeric ASCII characters. Each of these functions are related, so I cover them together in this post that continues my exploration of the ctype functions.
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I wouldn’t say that the isupper() and islower() functions are the opposite of the toupper() and tolower() functions, though they do play well together. This week I continue my exploration of the ctype functions.
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The easiest way to mess with characters in C is to employ the ctype functions. I name this category of library functions after the ctype.h header file that defines them. Some are true functions, some are macros. Each function can be replicated with standard C code, though it’s quicker to use an established function than to code your own. But that’s not the point of learning to program!
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Any C programmer eager to mess with characters or strings knows about the handy ctype functions. I use this name because these functions, which include a few macros, are defined in the ctype.h header file. Their job is to manipulate and examine characters.
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The point of extracting data chunks from a grid is to obtain the average of their values. This approach is how I reduce the massive amount of data stored in an image for representation as ASCII text. (See the thumbnail above.)
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The next step in dividing a grid of data into chunks is to extract each of the chunks. Last week’s Lesson used color to visually identify the data chunks. This week’s update to the code pulls these chunks from the grid, using their values and colors to confirm that everything matches up properly.
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Today marks the 13th anniversary of this blog’s first post. The blog didn’t go live for a few months, specifically to ensure that I would A) keep up the posts (a fault with many blogs) and B) have plenty of material for visitors to peruse. It’s been going strong and consistently since that original post, April 13th, 2013.
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