我今天刚学编程，超级小白，看一下我的第一个程序为啥错啊
// area.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)


   #define pi 3.14
   #define r
   #define s
   #define v
   float v=0;
   float s=0;
   float r=0;

   cout<<"球半径是";
   cin>>r
   
   v=pi*r*r*4/3;

   s=4*pi*r*r
   cout<<"球的体积是"<<v<<endl;
   cout<<"球的表面积是"<<s<<endl;
   return 0;

以下是错误原因，我看不懂啊
H:\VC++6.0\MSDev98\MyProjects\helloworld\area\area.cpp(6) : error C2146: syntax error : missing ';' before identifier 'WinMain'
H:\VC++6.0\MSDev98\MyProjects\helloworld\area\area.cpp(6) : fatal error C1004: unexpected end of file found
执行 cl.exe 时出错.
帮我解答下吧，谢谢了

以后准备泡在这个论坛里了，解答下，谢谢