2kaud,

Thank you for the useful input. I've applied it, and it does seem to at least change the error messages I'm getting.

I have some additional questions for you, if you happen to be able to favor me with a response. Thank you.

1. What does "using namespace std;" do? I ask, because this is a "managed code" project, and the managed code that produces the form for Windows under VC++ 2010 is also referencing a DIFFERENT namespace. The VC++ managed code namespace reference is right where you told me to put the std namespace reference. It is in the "main.cpp" equivalent, and it looks like:

(Imagine this is in "code tags", please...)

// Friedman.cpp : main project file.

#include "stdafx.h"
#include <vector>
#include <stdio.h>
using namespace std;
#include "Einstein.h"
#include <math.h>
#include "Form1.h"
using namespace Friedman;

As you can see, it references the name of the "solution/project", which is Friedman, as the "namespace". I don't understand "namespace" as a reference, so I don't know if I'm stepping on toes with the "std namespace" reference.

2. I'm getting a new batch of errors, but they seem less obstinate than the first. Honestly, I haven't given them a great deal of thought yet, since I'm a little nervous regarding my lack of understanding of what I've actually done by incorporating two "namespace" references in the "main.cpp" equivalent.

ERRORS from "build" attempt:

------ Build started: Project: Friedman, Configuration: Debug Win32 ------
Friedman.cpp
d:\documents and settings\xx\my documents\visual studio 2010\projects\friedman\friedman\Einstein.h(22): warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
C:\Program Files\Microsoft Visual Studio 10.0\VC\include\stdio.h(234) : see declaration of 'fopen'
d:\documents and settings\del ventruella\my documents\visual studio 2010\projects\friedman\friedman\Form1.h(88): error C2039: 'R' : is not a member of 'std::vector<_Ty>'
with
[
_Ty=SizeAll
]
d:\documents and settings\xx\my documents\visual studio 2010\projects\friedman\friedman\Form1.h(89): error C2039: 'year' : is not a member of 'std::vector<_Ty>'
with
[
_Ty=SizeAll
]
d:\documents and settings\xx\my documents\visual studio 2010\projects\friedman\friedman\Form1.h(92): error C2039: 'year' : is not a member of 'std::vector<_Ty>'
with
[
_Ty=SizeAll
]
d:\documents and settings\xx\my documents\visual studio 2010\projects\friedman\friedman\Form1.h(93): error C2039: 'R' : is not a member of 'std::vector<_Ty>'
with
[
_Ty=SizeAll
]
d:\documents and settings\xx\my documents\visual studio 2010\projects\friedman\friedman\Form1.h(96): error C2664: 'write_to_file' : cannot convert parameter 2 from 'std::vector<_Ty> *' to 'SizeAll *'
with
[
_Ty=SizeAll
]
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


Thank you for your understanding regarding the appearance of some of this data.