急，高手快帮帮我，在钱等！！！ 编译通不过，不知是为什么，谢谢帮助 !!!1

#include <iostream>

using namespace std;

int main()

{

ofstream outfile;

outfile.open("abc.dat",ios::out);

return 0;

}

--------------------Configuration: p39 - Win32 Debug--------------------

Compiling...

p38.cpp

C:\Program Files\Microsoft Visual Studio\MyProjects\p39\p38.cpp(5) : error C2079: 'outfile' uses undefined class 'basic_ofstream<char,struct std::char_traits<char> >'

C:\Program Files\Microsoft Visual Studio\MyProjects\p39\p38.cpp(6) : error C2228: left of '.open' must have class/struct/union type

Error executing cl.exe.

[567 byte] By [msdn] at [2007-8-14 13:07:50]