听孙鑫老师的视频，第一个例子照着做的，就有毛病了，请高手指教一下

#include<iostream.h>
struct Pt
{int x;
 int y;
}
 void main()
 {Pt p;
  p.x=2;
  p.y=9;
  cout<<p.x<<endl<<p.y<<endl;
 }
错误提示：D:\BB\a\a.cpp(6) : error C2628: 'Pt' followed by 'void' is illegal (did you forget a ';'?)
D:\BB\a\a.cpp(11) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

a.exe - 1 error(s), 1 warning(s)