Hi guys
thanks for the replies. I havent got rid of the previous problem but I tried a new toy project to understand the linking. It is as follows

code for dll
example.cpp
---------------

/ Example.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"

// This function is used to calculate the total area of a parallelepiped rectangle
double BoxArea(double L, double H, double W);
// This function is used to calculate the volume of a parallelepiped rectangle
double BoxVolume(double L, double H, double W);
// This function is used to get the dimensions of a rectangular parallelepiped
// calculate the area and volume, then pass the calculated values to the
// function that called it.
extern "C" __declspec(dllexport)void BoxProperties(double Length, double Height,
double Width, double& Area, double& Volume);

BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
return TRUE;
}

double BoxArea(double L, double H, double W)
{
return 2 * ((L*H) + (L*W) + (H*W));
}

double BoxVolume(double L, double H, double W)
{
return L * H * W;
}

void BoxProperties(double L, double H, double W, double& A, double& V)
{
A = BoxArea(L, H, W);
V = BoxVolume(L, H, W);
}

I build the project and there were no errors and I got the .lib and .dll files upon building the project.

There is another project where I am trying to use the .lib generated above. I have copied the Example.lib, Example.dll and Example.obj to the new project folder . I also added these files to the project. In the project->settings->link->input I appended Example.lib to the Object/Library module text box . I wrote the following cpp code in the new project.
test.cpp
-----------
#include <iostream>

extern "C" __declspec(dllimport)void BoxProperties(double L, double H,
double W, double& A, double& V);

int main()
{
double Length, Height, Width, Area, Volume;

cout << "Enter the dimensions of the box\n";
cout << "Length: ";
cin >> Length;
cout << "Height: ";
cin >> Height;
cout << "Width: ";
cin >> Width;

BoxProperties(Length, Height, Width, Area, Volume);

cout << "\nProperties of the box";
cout << "\nLength: " << Length;
cout << "\nHeight: " << Height;
cout << "\nWidth: " << Width;
cout << "\nArea: " << Area;
cout << "\nVolumne: " << Volume;

cout << "\n\n";

return 0;
}

After building the code I get the following linker error(no previous linker errors ):

--------------------Configuration: Exampletest - Win32 Debug--------------------
Linking...
Creating library Debug/Exampletest.lib and object Debug/Exampletest.exp
LIBCMTD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/Exampletest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Exampletest.exe - 2 error(s), 0 warning(s)

Guys help me resolve this

Thanks