using static System.Console;

public class Program {
    public static void Main() {
        var vetor = new Vetor(3, 4);
        var vetor2 = vetor * 2f;
        WriteLine($"X = {vetor2.X}, Y = {vetor2.Y}");
    }
}

public struct Vetor {
    public float X, Y;
    public Vetor(float X, float Y) {
        this.X = X;
        this.Y = Y;
    }
    public static Vetor operator *(Vetor left, float right) => new Vetor(left.X * right, left.Y * right);
}

//https://pt.stackoverflow.com/q/230538/101