Hexadecimal, or counting base 16, uses letters A through F to represent values 11 through 15. This base — “hex” — is common in programming as it works as a shorthand for binary values. But the letters used are also letters, which means that they can spell words.
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The challenge for this month’s Exercise is to write code that uses the Ethiopian Multiplication method. The process involves doubling and halving the factors, then eliminating and finally tallying the result.
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Silly me. I once assumed that just because my compiler offered the random() function — a superior version of the C library standard rand() function — that every compiler fatured this function. Boy, was I wrong!
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I remember memorizing the “times tables,” which is how most American kids learn to multiply. Committing single digit multiplication values to memory helps perform multiplication and division problems, but it’s not the only way to calculate the result.
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Learning division in school means long division. The process involves a quotient and a remainder. For example, 42÷8 works out to 5 (quotient) with 2 remainder. On a computer, however, division renders the result as 5.25. So how do you get the remainder separated?
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The original K&R, the first C programming book — and truly the programming book all others are based upon, is famous for its “Hello, world!” program. It’s the first program in the book. But what about the second program? Do you know what it is?
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Bouncing a cursor on the screen is a fun programming exercise, and you can use common C library techniques and ANSI escape sequences to make it happen in a terminal window, as covered in last week’s Lesson. At this point, most programmers would be content and leave well enough alone. Not me!
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My solution for this month’s Exercise relies upon the solution from last month’s Exercise, specifically the way the matrixes are presented in the main() function and the use of the output() function. What I added is the multiply() function, which multiplies the two matrixes.
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For last week’s Lesson, I gathered various techniques to show how the terminal screen can be manipulated directly in C without using a library like Ncurses. I have a few more tricks to show.
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The task for last month’s Exercise was to describe complex data — a matrix. For this month’s Exercise, your task is to multiply these matrixes.
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