You probably don’t even think about it. How do the toupper() and tolower() functions do their magic? Both functions take a letter of one case and convert it to the same letter of the opposite case. They don’t touch any other characters or symbols.
Well, how would you code it?
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The clever organization of ASCII character codes lends itself to some useful programming tricks. One of those tricks involves converting from character codes ‘0’ through ‘9’ to integer values zero through nine.
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ASCII refers to character codes from zero through 127. These codes are interpreted identically on all modern computers. They represent basic alphabetic, numeric, and symbol characters.
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The task for this month’s Exercise was to create code that outputs an inverse number pyramid.
Here’s what such a thing looks like:
0000000000
999999999
88888888
7777777
666666
55555
4444
333
22
1As you sit and madly pound out code, variable names are probably not at the top of your list of things to do better. I tend to use x for my loops, c or ch for characters, and other variables, including a, b, and c. This is an acceptable approach, but for larger programs such variable names not doing you any favors.
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Two things that seem to be difficult for a beginning C programmer are numbers and their formatted presentation. I admit: These things are difficult to understand. Therefore some practice is in order.
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Structures aren’t really scary. Pointers are scary. Obviously, a good way to make structures more terrifying it so throw some pointers at them.
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A structure is capable of containing any other type of C language variable. That includes other structures.
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In the C language, struct is a variable type, but do you declare a structure or define a structure? That one has me perplexed.
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Some programmers find it charming that C can be so frustratingly obscure. In fact, a lot of the language’s perplexing nature is simply a reflection of its efficiency.
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