errors on building visual c++ program

hey guys i'm learning visual c++ and i'm getting errors on building the following program.it's from a book and so i expected it to run but it's giving errors please tell me what they mean and how to get rid of them

code:
#include<windows.h>
int_stdcall WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
MessageBox(0,"Hello!","title",0);
return(0);
}


error C2146: syntax error : missing ';' before identifier 'WinMain'

error C2501: 'int_stdcall' : missing storage-class or type specifiers

fatal error C1004: unexpected end of file found


p.s. i did not install msdn library. does that affect?