我如何获得点的中心？

Question

Problem: Create a vector consisting of point objects in a two-dimensional plane, calculate the average of the x and y coordinates of the point objects, and write a program that outputs the center of the points.

#include <iostream>
#include <string>
#include <iomanip>
#include <vector>
using namespace std;

class Point 
{
    public:

        Point(std::string pname = NULL, int px = 0, int py = 0)

        {
            setName(pname); setX(px); setY(py);
        }

        std::string getName() { return name; }

        int getX() { return x; }

        int getY() { return y; }

        void setName(std::string pname) { name = pname; }

        void setX(int px) { x = px; }

        void setY(int py) { y = py; }

    private:

        std::string name;

        int x;

        int y;

};

int main()
{
    int a;
    int counter = 0;
    cout << "number of points" << endl;
    cin >> a;
    vector<Point> v1(a);
    while (counter < a)
    {
        Point p1;

        string tmp;
        int tmp_x;
        int tmp_y;

        cout << "name of point" << endl;
        cin >> tmp;
        p1.setName(tmp);
        
        cout << "position of point" << endl;
        cin >> tmp_x >> tmp_y;
        p1.setX(tmp_x);
        p1.setY(tmp_y);

        v1.push_back(p1);
        cout << p1.getName() <<p1.getX() << p1.getY() << endl; 
    }
    return 0;
}

this is an example of what I want (inline is keyboard input)

Number of points: 2

Name of point: p1 position of a point: 10 20 p1 (10, 20)

Name of point: p2 position of a point: 40 50 p2 (40, 50)

centor of points:(25.0, 35.0)

How should I approach averaging?

Answer 1

1. You don't need all of those #include s.

2. Pay attention to NULL in class constructor.

3. Loop continuation condition: a-- . Variable counter is redundant.

4. Vector is dynamic data structure. You don't need to declare its size explicitly, in this exercise. Member-function push_back will do dirty work for you.

5. One more extra variable p1 . Try:

    v1.push_back( { tmp, tmp_x, tmp_y } );

6. Finally...

    double // if precision is necessary total_x{}, total_y{}; for ( auto& point: v1 ) { total_x += point.getX(); total_y += point.getY(); } std::cout << "Average X: " << total_x / v1.size() << "\nAverage Y: " << total_y / v1.size(); return EXIT_SUCCESS;