In our last episode, the unique words code is able to parse and list individual words in the buffer. To find unique and duplicate words, the next step is to sort the list.
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A Tally of Unique Words, Part IV
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Author Archives: dgookin
A Tally of Unique Words, Part III
From last week’s Lesson, the text in a buffer is parsed, creating pointers to each word in the string. Alas, the addresses of these words (the pointers) aren’t saved, which is stupid. To handle the job, and to keep the Unique Words project moving forward, a dynamic array of pointers must be allocated.
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A Tally of Unique Words, Part II
Continuing with my Unique Words project from last week’s Lesson: Once the buffer contains text, the next step is to parse the words: to split the long string of text stored in memory into separate word chunks. For this task, I turn to my old pall, the strtok() function.
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A Tally of Unique Words, Part I
It’s easy for a good C programmer to code a program to tally the number of unique words in a chunk of text. Further, the computer could track repeating words. This task would drive a human nuts, but a computer? No problem.
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Encoding a String – Solution
The task for this month’s Exercise is to write an encoding filter that follows a specific pattern: After the first character (or byte) is output as a 2-digit hex value, the remaining characters are output as the difference between the previous character and the current character. I’m sure this type of encoding has an official name, but it’s the holidays and I’m too lazy to look it up.
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Parsing Words with the strspn() Function
I’ve dabbled on the topic of parsing words from a string several times on this blog: Slicing Words from a String, Parse and Count Words in a String, and more. I just can’t have enough! In fact, this Lesson picks up the topic again, continuing my discussion of the strspn() and strcspn() functions from last week’s Lesson.
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Encoding a String
Difficulty: Medium
Here is your message:
48190F0009A72827FDFDFBFD18FAAD460CFDFEB323EA192903BB1731F800FCFC0E97
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The String Span Functions
When I scour the C for functions to assist my code, if often overlook a few that seem dull or confusing. One of those I’ve always glossed over is the strspn() function, as well as its counterpart, strcspn().
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All Those _t Data Types
You see them often if you code in C: time_t, size_t, and other _t data types, usually specific to some function or library. The C gurus have a method to their madness when it comes to naming these variables. The _t stands for something. It’s very consistent on purpose.
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Declaring Structures, Trick #3
Bitfields in a structure are weird, as I covered in last week’s Lesson. If you’re a nerd who appreciates bits and bit manipulation, you’re probably in love. These bitwise tricks are things the C language excels at. With a keen knowledge of bits, and a desire to use integer values beyond the standard widths, a nerd can have a lot of fun in C.
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