# include <string>
# include <fstream.h>
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <iostream.h>
# include <io.h>
# include <direct.h>
using namespace std;
编译时出错:
error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversion)
能否帮助一下?我是个C++初学者。