Bod.cs

using System;
using System.Collections.Generic;

internal class Program {

    static void Main(string[] args) {
        Bod bod = new Bod();
        Console.WriteLine("Zadej souřadnice bodu");
        bod.nacti_souradnici();
        Bod posun = new Bod();
        Console.WriteLine("Zadej posunutí");
        posun.nacti_souradnici();
        bod.posunuti(posun);
        bod.vypis_souradnice();
        Console.WriteLine(bod.vypocitej_vzdalenost(0, 0));
    }
}

class Bod {
    public int x {get; set;}
    public int  y {get; set;}

    public Bod() {
        x = 0;
        y = 0;
    }

    public Bod(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public void posunuti(Bod bod) {
        this.x += bod.x;
        this.y += bod.y;
    }

    public void vypis_souradnice() {
        Console.WriteLine($"[{x}, {y}]");
    }

    public double vypocitej_vzdalenost(int x, int y) {
        int dx = this.x - x;
        int dy = this.y - y;
        return Math.Sqrt(dx*dx + dy*dy);
    }

    public void nacti_souradnici() {
        Console.Write("x: ");
        x = Convert.ToInt32(Console.ReadLine());
        Console.Write("y: ");
        y = Convert.ToInt32(Console.ReadLine());
    }
}