using System;  //引用 系統API

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//建立類別 修飾詞 public

public class Learn

{       

       public Person Person1 = new Person();  //建立實體物件

       public Person Person2 = new Person();  //建立實體物件

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   public void Main() //程式進入點

   {

       //控制台物件的封裝方法 寫字("");

       //Console.WriteLine("Hello Word :)");

       Person1.Name = "小明";  //存放欄位 Person1

       Person1.Height = 160;

       Person1.Weight = 55;

       Person1.Age =20;

       Person2.Name = "小華";//存放欄位 Person2

       Person2.Height = 180;

       Person2.Weight = 70;

       Person2.Age =18;

       Console.WriteLine(Person1.Name + "年紀為"+ Person1.Age);    //取得欄位   Person1  

       Console.WriteLine("身高為 :"+Person1.Height +"\t"+"體重為"+ Person1.Weight+"\n"); 

       Console.WriteLine(Person2.Name + "年紀為"+ Person2.Age);    //取得欄位   Person2

       Console.WriteLine("身高為 :"+Person2.Height +"\t"+ "體重為"+ Person2.Weight+"\n");

       Person1.Talk();   //呼叫方法 Method Talk()

       Person2.Talk();

       Console.WriteLine(Person1.Name + "BMI為 : "+ Person1.BMI());  //呼叫方法 Method BMI()

       Console.WriteLine(Person2.Name + "BMI為 : "+ Person2.BMI());

       Person1.Walk("左","倒車音效");    //使用方法(參數)

       Person2.Walk("右");

       Person2.Walk("前", 10);  //多載 方法呼叫

   }

}

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public class Person

{   

    public const int Legs = 2, Hand =2;//公開 常數 正數 腿=2 手=2

    public int Age = 31;  //有號+-整數 int

    public float Height = 168f; //float 單精浮點數 後面要加F 不然編譯會錯誤

    public float Weight = 58.5f; 

    public bool Adult = false; //預設為成年

    public string Name = "FU"; //stirng 字串型別: 存放文字，使用 "13245"; 設為參考型別 

    //方法

    //void 無回傳值

    public void Talk()

    {       

        Console.WriteLine(Name + ":我的身高為 : "+ Height +"體重 : "+ Weight+"   年齡 : "+ Age);     

    }

    //回傳值為 float 的方法

    public float BMI()

    {

        return Weight /((Height/100)*(Height /100)); 

    }   

    //參數 : 參數型別 參數名稱 ,參數型別2 = "值"

    //有預設的參數要放右邊

    public void Walk(string direction , string sound ="走路音效")

    {

        Console.WriteLine(sound);

        Console.WriteLine(Name +"往"+ direction + "走");

    }   

    //多載 : 參數類型或數目不同

    public void Walk(string direction,int speed)

    {

        Console.WriteLine(Name +"往"+ direction + "走，時速為: "+speed);

    }

}