C#编程题：应用类的继承性，通过基类和派生类完成以下功能：给出正方

首先定义两个类如下：

// 正方形类
    public class Square
    {
        // 正方形的边长
        public float Lenght { get; set; }
        protected float AreaCompute()
        {
             return  Lenght* Lenght;
        }
 
        // 计算正方形的面积
        public virtual float Area()
        {
            return AreaCompute();
        }
 
        // 计算正方形的周长
        public virtual float Circumference()
        {
            return Lenght * 4;
        }
    }
 
    // 正方体类
    public class Cube:Square
    {
        // 正方体的高
        public float Height{get;set;}
 
        // 表面积
        public override float Area()
        {
            return AreaCompute() * 6;
        }
        // 体积
        public override float Circumference()
        {
            return AreaCompute() * Height;
        }
    }

调用测试：

Square square = new Square()
            {
                 Lenght=5f
            };
            Console.WriteLine("正方形面积：{0}",square.Area());
            Console.WriteLine("正方形周长：{0}", square.Circumference());
 
            Cube cube = new Cube()
            {
                 Lenght=6f,
                  Height=4
            };
            Console.WriteLine("正方体表面积：{0}", cube.Area());
            Console.WriteLine("正方形体积：{0}", cube.Circumference());