using System;

public class Program

{

    public static void Main() {

        HVector pos = new HVector(10,0);

        changeVec(pos);

        Console.WriteLine(pos.X);

​

        int demo = 5;

        changeFake(demo);

        Console.WriteLine(demo);

    }

    static void changeVec(HVector value) {

        value.X *= 10;

    }

​

​

    static void changeFake(int value) {

        value *= 20;

    }

}

​

public class HVector

{

    public int X;

    public int Y;

​

    public HVector(int x, int y) {

        X = x;

        Y = y;

    }

}