在C ++ Builder中发布C ++的问题

Question

I have written a C++ program for a University assignment. I used Netbeans 6.8 running on my Mac and the code runs smoothly, no warnings, errors or problems/bugs. However when compiling and running on a Windows computer using CodeGear RAD Studio 2009 (C++ Builder) am getting several errors.

[BCC32 Error] main.cpp(51): E2094 'operator<<' not implemented in type 'ostream' for arguments of type 'string'
[BCC32 Error] main.cpp(62): E2093 'operator==' not implemented in type 'string' for arguments of the same type
[BCC32 Error] main.cpp(67): E2093 'operator==' not implemented in type 'string' for arguments of the same type
[BCC32 Error] main.cpp(112): E2093 'operator==' not implemented in type 'string' for arguments of the same type
[BCC32 Error] main.cpp(121): E2094 'operator<<' not implemented in type 'ostream' for arguments of type 'string'
[BCC32 Error] main.cpp(130): E2093 'operator==' not implemented in type 'string' for arguments of the same type
[BCC32 Error] main.cpp(133): E2094 'operator<<' not implemented in type 'ostream' for arguments of type 'string'
[BCC32 Error] main.cpp(139): E2094 'operator<<' not implemented in type 'ostream' for arguments of type 'string'
[BCC32 Error] main.cpp(153): E2094 'operator<<' not implemented in type 'fstream' for arguments of type 'string'
[BCC32 Error] main.cpp(199): E2094 'operator>>' not implemented in type 'fstream' for arguments of type 'string'
[BCC32 Error] main.cpp(219): E2094 'operator>>' not implemented in type 'istream' for arguments of type 'string'
[BCC32 Error] main.cpp(231): E2094 'operator>>' not implemented in type 'istream' for arguments of type 'string'
[BCC32 Error] main.cpp(240): E2094 'operator>>' not implemented in type 'istream' for arguments of type 'string'
[BCC32 Error] main.cpp(262): E2094 'operator>>' not implemented in type 'istream' for arguments of type 'string'
[BCC32 Error] main.cpp(264): E2094 'operator>>' not implemented in type 'istream' for arguments of type 'string'

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These are the header files am using

#include <iostream>
#include <fstream>
#include <cmath>
#include <stdio>
#include <windows> //I added this one just to check and still does not work (I didnt have it on Netbeans/Mac)
using namespace std;

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Any ideas what is producing the errors and how can I fix it?

Answer 1

You need:

#include <string>

and it's:

#include <windows.h>

though I doubt you need it.

The reason your code worked on one platform but not another is that on the first platform one of the other library headers was including <string> itself. This behaviour is not specified by the C++ Standard, so the only safe rule is:

If you use a class or a function, always explicitly #include the header for that class or function in your code.

Answer 2

您可以在string对象上执行此操作：

to_string < char,std::string::traits_type,std::string::allocator_type>()