8000 Ch 16 ex 10(b). The formula for finding the center coordinates of (struct rectangle) r must be the midpoint formula NOT the average length between the coordinates · Issue #135 · williamgherman/c-solutions · GitHub
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Ch 16 ex 10(b). The formula for finding the center coordinates of (struct rectangle) r must be the midpoint formula NOT the average length between the coordinates #135

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MKing8992 opened this issue Dec 11, 2024 · 1 comment
Open

Ch 16 ex 10(b). The formula for finding the center coordinates of (struct rectangle) r must be the midpoint formula NOT the average length between the coordinates #135

MKing8992 opened this issue Dec 11, 2024 · 1 comment

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@MKing8992
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MKing8992 commented Dec 11, 2024 •
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Hello. Excited to contribute! This should be a really easy fix!
Prompt for chapter 16 exercise 10(b):

The following structures are designed to store information about the objects on a graphics screen:

struct point {int x, y;);
struct rectangle { struct point upper_left, lower_right; };

(b) Compute the center of r, returning it as point value. If either the x or y coordinate of the center isn't an integer, store its truncated value in the point structure

Current solution:

struct point rectangle_center(struct rectangle r) {
    return (struct point) {(r.lower_right.x - r.upper_left.x) / 2,
                           (r.lower_right.y - r.upper_left.y) / 2};
}

With the midpoint formula in mind the correct usage is:

struct point rectangle_center(struct rectangle r) {
    return (struct point) {(r.lower_right.x + r.upper_left.x) / 2,
                           (r.lower_right.y + r.upper_left.y) / 2};
}
@MKing8992
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Sorry. Still learning the ins and outs. I don't know if posting this was necessary or out. I have made a pull request for the problem mentioned here.

@MKing8992 MKing8992 changed the title The correct mathematical formula for finding the center coordinates of (struct rectangle) r must be the midpoint formula NOT the average length between the coordinates Ch 16 ex 10(b). The formula for finding the center coordinates of (struct rectangle) r must be the midpoint formula NOT the average length between the coordinates Dec 11, 2024
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