暫時用C++寫左.
2個Parent class. (Pistol, Rifle)
(Parent class: Pistol, Sub Class: 銀雞)
(Parent class: Rifle Sub Class: AR15)
GunStructure:
GunName string
GunDesc string,
Damage int,
EffRange float,
WeaponType Enum
Cost int
Finite State Machine
1. 按[E] 汁槍.

2.無槍: 跑, 行
3.有槍: Aim Down Sight.
