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

[MKing8992]

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]

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.