using System;

namespace TankFireTest
{
    public class Vector3
    {
        public Vector3(float ix, float iy, float iz)
        {
            X = ix;
            Y = iy;
            Z = iz;
        }

        public float X { get; set; }
        public float Y { get; set; }
        public float Z { get; set; }

        public static float DotProduct(Vector3 a, Vector3 b)
        {
            return (a.X * b.X) + (a.Y * b.Y) + (a.Z * b.Z);
        }
        public static float GetLength(Vector3 v)
        {
            float len2 = (v.X * v.X) + (v.Y * v.Y) + (v.Z * v.Z);
            return (float)Math.Sqrt(len2);
        }
    }

    class Program
    {
        bool TankCanFire( playerRange, enemyPosition )
        {
            if (playerRange <= enemyTankPosition )
            {
                return true;
            }
                return false;

        }

        static void Main(string[] args)
        {
            Vector3 playerPosition = new Vector3( 10, 15, 10 );
            Vector3 playerFacing = new Vector3(0.0f, 0.0f, 1.0f);
            float playerRange = 100.0f;

            Vector3 enemyTankPosition = new Vector3( -15, 10, 25 );
            Vector3 enemyFacing = new Vector3(0.0f, 0.0f, 1.0f);

            if (TankCanFire(playerRange,enemyPosition)== true)
            {
                Console.WriteLine("Firing!");
            }
            else
            {
                Console.WriteLine("Cannot fire");
            }
        }
    }
}