c#类和函数

using System;

namespace ConsoleApp2
{ struct Node {
        public double name;
        public double age;
    };
    class Book {
        public int number;
        public int salary;
        public Book(int number1, int salary1)
        {
            number = number1;
            salary = salary1;
        }
        public void show() {
            Console.WriteLine(number + " " + salary);
        }
        static void Main(string[] args)
        {
            Book s = new Book(20, 30);
            s.show();
            s = new Lib(50, 50, 30);
            s.show();
            Node s1 = new Node();
            s1.age = 12;
            s1.name = 11;
            Console.WriteLine(s1.age + " " + s1.name);
        }



    }
    class Lib : Book 
    { 
        public double s;
        public Lib(int number1, int salary1,double s1):base(number1,salary1)
        {
        s= s1;
        }
        public void show() {
            Console.WriteLine(salary + " " + s);
        }



    }
}