Question

I will not paste the whole program, but just the included files and the errors, as I am very sure, the error lies there itself!

Files included in VS 2010

#include <cstdlib>
#include <windows.h>
#include "iostream"
#include "conio.h"
#include "vector"
#include "math.h"
#include <string.h>
#include <bitset>

Files included in Visual C++ 6.0

#include <cstdlib>
#include <windows.h>
#include "iostream"
#include "conio.h"
#include "vector"
#include "math.h"
#include <string.h>
#include <bitset>
#include <String>

Well, there is just one difference, I added #include <String> in Visual C++ 2006, this particular file reduced the error which read as

error C2678: binary ‘!=’ : no operator defined which takes a left-hand operand of type () ‘class std::basic_string,class std::allocator >’
(or there is no acceptable conversion)

The other major errors I am still facing in VS2006 are

Line : str.append(to_string((long double)(value)));

Error: error C2065: 'to_string' : undeclared identifier

Line: vector <vector <float>> distOfSectionPoint, momentAtSectionPoint, preFinalMoment, finalMoments, momentAtSectionPtOnPtLoadProfile ;

Error: error C2208: 'class std::vector' : no members defined using this type

Can anyone explain what goes wrong in Visual C++ 2006??

Answer 1

Assuming to_string is std::to_string, then that’s a C++11 function which won’t be available in older compilers. You could cobble together something roughly equivalent, like

template <typename T>
std::string nonstd::to_string(T const & t) {
    std::ostringstream s;
    s << t;
    // For bonus points, add some error checking here
    return s.str();
}

The error involving vector is caused by the two closing angle-brackets, which older compilers would interpret as a single >> token. Add a space between them:

vector<vector<float> >
                    ^

It’s not quite clear which compiler you’re using, since there was no Visual C++ 2006. If you actually mean Visual C++ 6.0 (from 1998), then you’re probably doomed. There have been two major language revisions since then, making it very difficult to write code supported by both that compiler, and modern compilers. If you mean 2005 or 2008, then just be careful to avoid C++11 features.