look/src/task10/2.cpp

#include <iostream>
#include <cmath>
#include <string>

struct Point {
    int x;
    int y;
    std::string color; // Поле для хранения цвета
    Point* next; // Указатель на следующую точку
};

double distance(const Point& p1, const Point& p2) {
    return std::sqrt(std::pow(p1.x - p2.x, 2) + std::pow(p1.y - p2.y, 2));
}

Point* findMinPoint(Point* head) {
    if (!head) return nullptr;
    Point* minPoint = head;
    Point* current = head->next;
    while (current != head) {
        if (current->x < minPoint->x || (current->x == minPoint->x && current->y < minPoint->y)) {
            minPoint = current;
        }
        current = current->next;
    }
    return minPoint;
}

double calculatePerimeter(Point* head) {
    if (!head || !head->next) return 0.0;
    double perimeter = 0.0;
    Point* current = head;
    do {
        perimeter += distance(*current, *current->next);
        current = current->next;
    } while (current != head);
    return perimeter;
}

void printPoint(const Point& p) {
    std::cout << "Point (" << p.x << ", " << p.y << ") - Color: " << p.color << std::endl;
}

int main() {
    Point p1 = {1, 2, "Red", nullptr};
    Point p2 = {3, 4, "Green", nullptr};
    Point p3 = {5, 6, "Blue", nullptr};

    p1.next = &p2;
    p2.next = &p3;
    p3.next = &p1; // Делаем список циклическим

    std::cout << "Accessing members through point:" << std::endl;
    printPoint(p1);
    std::cout << "Accessing members through pointer:" << std::endl;
    printPoint(*p1.next);

    Point p4 = p1;
    std::cout << "After assignment:" << std::endl;
    printPoint(p4);

    std::cout << "Distance between p1 and p2: " << distance(p1, p2) << std::endl;

    Point* ptr = &p1;
    std::cout << "Incrementing pointer:" << std::endl;
    ptr = ptr->next;
    printPoint(*ptr);

    Point* minPoint = findMinPoint(&p1);
    std::cout << "Point with minimum coordinates:" << std::endl;
    printPoint(*minPoint);

    std::cout << "Perimeter of the polygon: " << calculatePerimeter(&p1) << std::endl;

    return 0;
}