#include <stdlib.h>

void bresenham(int x1, int y1, int x2, int y2) {
    int dx = x2 - x1;
    int dy = y2 - y1;
    int m = 2 * dy;
    int err = 0;

    if (m > 0) {
        err = m - dx;
    } else if (m < 0) {
        err = m + dx;
    }
    for (int x = x1, y = y1; x <= x2; x++) {
        printf("(%d, %d) [%d]\n", x, y, err);

        err += m;

        if (m > 0) {
            if (err >= 0) {
                y++;
                err -= 2 * dx;
            }
        } else if (m < 0) {
            if (err <= 0) {
                y--;
                err += 2 * dx;
            }
        }
    }
}