// Sample class and client code for a point class that has the same
// functionality as the class point.java that we discussed.  One of the biggest
// differences was that we needed to indicate which member functions are const
// member functions for our client code to work properly.

#include <iostream>
#include <sstream>
#include <cmath>
#include <vector>

using namespace std;

class point {
public:
    point(int initX = 0, int initY = 0) {
        setLocation(initX, initY);
        // the following line of code would not normally be included in a
        // constructor, but it allowed us to see what point objects were being
        // constructed
        cout << "constructing " << to_string() << endl;
    }

    // return a string representation of the point
    string to_string() const {
        ostringstream out;
        out << "(" << x << ", " << y << ")";
        return out.str();
    }

    // translate the coordinates by the given amount
    void translate(int dx, int dy) {
        x += dx;
        y += dy;
    }

    // return the distance from the origin of this point
    double distance_from_origin() const {
        return sqrt(x * x + y * y);
    }

    // return the x coordinate of this point
    int getX() const {
        return x;
    }

    // return the y coordinate of this point
    int getY() const {
        return y;
    }

    // set the coordinates of this point
    void setLocation(int newX, int newY) {
        x = newX;
        y = newY;
    }
private:
    int x, y;
};

// returns a count of the number of points in the given vector that have x and
// y values that are equal
int count_equal(const vector<point> & points) {
    int count = 0;
    for (const point & p : points) {
        if (p.getX() == p.getY()) {
            count++;
        }
    }
    return count;
}

int main() {
    point p1;
    point p2;
    p2.setLocation(3, 18);
    point p3(13, 5);

    cout << "p1 = " << p1.to_string() << endl;
    cout << "p2 = " << p2.to_string() << endl;
    cout << "p3 = " << p3.to_string() << endl;
    cout << endl;

    p1.translate(3, 8);
    cout << "p1 now = " << p1.to_string() << endl;
    cout << endl;

    cout << "p1 distance from origin = " << p1.distance_from_origin() << endl;
    cout << "p2 distance from origin = " << p2.distance_from_origin() << endl;
    cout << "p3 distance from origin = " << p3.distance_from_origin() << endl;
    cout << endl;

    vector<point> v;
    for (int i = 1; i <= 3; i++) {
        for (int j = 1; j <= 3; j++) {
            v.push_back(point(i, j));
        }
    }
    cout << "number of equal points = " << count_equal(v) << endl;

    return 0;
}