结构体

using System;

struct Point
{
    public double x, y;
    
    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public double R(){
        return Math.Sqrt(x*x+y*y);
    }
}

class Tes
{
    static void Main() {
        Point[] points = new Point[100];

        for (int i = 0; i < 100; i++)
            points[i] = new Point(i, i*i);
    }
}