using System;

using System.Collections.Generic;

using System.Numerics;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        CVector3 vec = default;

        vec.SetX(11);

        Console.WriteLine(vec);

        CVector3 vec2 = default;

        vec2.SetX(11).SetY(11);

        Console.WriteLine(vec2);

        CVector3 vec3 = default;

        vec3 = vec.SetX(11).SetY(32);

        Console.WriteLine(vec3);

    }

}

​

public struct CVector3 {

    public float X, Y, Z;

    public CVector3 SetX(float x) {

        X = x;

        return this;

    }

    public CVector3 SetY(float y) {

        Y = y;

        return this;

    }

    public CVector3 SetZ(float z) {

        Z = z;

        return this;

    }

    public override string ToString() {

        return "CVector3(" + X + ", " + Y + ", " + Z + ")";

    }

}