class a{};
struct a{};

public struct student{};
internal struct student{};

using System;
public struct student
{
  public int x;
};
class program
{
 public static void Main()
 {
  student obj=new student();
  obj.x=100;  
 }
};

using System;
public struct student
{
  public static int a = 10;
};
class exe
{
 public static void Main()
 {
  Console.WriteLine( student.a = 100);
 }
};

using System;
class base
{
 public struct student
 {
  public static int a = 10;
 };
}
class exe
{
 public static void Main()
 {
  Console.WriteLine( base.student.a = 100);
 }
};

public struct student
{
  public int x;
  public int y;
  public static int z;
  public student(int a,int b,int c)
  {
   x=a;
   y=b;
   student.z=c;
  }
};

public struct student
{
  public void list()
  {
   Console.WriteLine("这是构造的函数");
  }
};

public struct student
{
  public int x;
  public int y;
  public static int z;
  public student(int a,int b,int c)
  {
   x=a;
   y=b;
   student.z=c;
  }
};
class program
{
 public static void Main()
 {
 student obj=new student(100,200,300);
 student obj2;
 obj2.x=100;
 obj2.y=200;
 student.z=300;
 }
}

using System;
class class_wsy
{
 public int x;
}
struct struct_wsy
{
 public int x;
}
class program
{
 public static void class_t(class_wsy obj)
 {
  obj.x = 90;
 }
 public static void struct_t(struct_wsy obj)
 {
  obj.x = 90;
 }
 public static void Main()
 {
  class_wsy obj_1 = new class_wsy();
  struct_wsy obj_2 = new struct_wsy();
  obj_1.x = 100;
  obj_2.x = 100;
  class_t(obj_1);
  struct_t(obj_2);
  Console.WriteLine("class_wsy obj_1.x={0}",obj_1.x);
  Console.WriteLine("struct_wsy obj_2.x={0}",obj_2.x);
  Console.Read();
 }
}

class_wsy obj_1.x=90
struct_wsy obj_2.x=100