using System;
namespace StructAndClass
{
  struct SPoint
  {
    public int x, y;
    public SPoint(int x, int y)
    {
      this.x = x;
      this.y = y;
    }
  }
  class CPoint
    {
      public int x, y;
      public CPoint(int x, int y)
      {
        this.x = x;
        this.y = y;
      }
    }
  class Test
  {
    public static void Main()
    {
      SPoint sp1 = new SPoint(2, 5);
      Console.WriteLine("结构/sp1初始值：");
      Console.WriteLine("sp1.x={0}", sp1.x);
      SPoint sp2 = sp1;
      Console.WriteLine("sp1=sp2后：");
      Console.WriteLine("sp1.x={0}");
      Console.WriteLine("sp1.x={0}", sp1.x);
      Console.WriteLine("sp2.x={0}", sp2.x);
      sp1.x = 5;
      Console.WriteLine("再次改变sp1的值后：");
      Console.WriteLine("sp1.x={0}", sp1.x);
      Console.WriteLine("sp2.x={0}", sp2.x);
      Console.WriteLine("============================");
      CPoint cp1 = new CPoint(2,5);
      Console.WriteLine("类/cp1初始值：");
      Console.WriteLine("cp1.x={0}", cp1.x);
      CPoint cp2 = cp1;
      Console.WriteLine("cp1=cp2后：");
      Console.WriteLine("cp1.x={0}", cp1.x);
      Console.WriteLine("cp2.x={0}", cp2.x);
      cp1.x = 5;
      Console.WriteLine("再次改变cp1的值后：");
      Console.WriteLine("cp1.x={0}", cp1.x);
      Console.WriteLine("cp2.x={0}", cp2.x);
      Console.ReadKey();
    }
  }
}

struct DC
  {
    public int x, y;
    public int X
    {
      set
      {
        x = value;
      }
      get
      {
        return x;
      }
    }
    public int Y
    {
      set
      {
        y = value;
      }
      get
      {
        return y;
      }
    }
    public DC(int x,int y)
    {
      this.x = x;
      this.y = y;
    }
  }
  struct RDC
  {
    public int x, y;
    public int X
    {
      set
      {
        x = value;
      }
      get
      {
        return x;
      }
    }
    public int Y
    {
      set
      {
        y = value;
      }
      get
      {
        return y;
      }
    }
    public RDC(int x, int y)
    {
      this.x = x;
      this.y = y;
    }
  }
  class Test
  {
    public static void Main()
    {
      DC dc=new DC();
      dc.x = 3;
      dc.y = 5;
      Console.WriteLine("已经对x,y初始化后：");
      Console.WriteLine("此时可以访问和修改dc.X={0}的值",dc.X);
      Console.WriteLine("我在这里创建了一个DC的复制结构RDC/n并且不对x,y初始化就会报错");
      RDC rdc;
       rdc.y = 5;//可以编译通过
       rdc.X = 3;//这里就会出错,不能编译通过
      Console.WriteLine("=======test over================");
     }
  }

 

struct DC
  {
    public int x, y;
    public int X
    {
      set
      {
        x = value;
      }
      get
      {
        return x;
      }
    }
    public int Y
    {
      set
      {
        y = value;
      }
      get
      {
        return y;
      }
    }
    public DC(int x,int y)
    {
      X= x;//这里就是错的
      Y = y;//会提示没有给this对象的所有字段赋值
    }
  }