c++按行读取、写入

ifstream in("C:\\Users\\Administrator\\Desktop\\ss.txt", ios::in);
ofstream write("C:\\Users\\Administrator\\Desktop\\ss-out.txt", ios::out);
for(string s;getline(in,s);)
{
	char *p = const_cast<char *>( s.c_str() );
	write <<s<<"\n";
}