Unresolved Externals!

This is more of a continuation of a previous problem, but the other post was filled with unrelated stuffs.

I have a class, CMatrix which has a few accessor methods (GetMatrix(), GetSingle(), GetRows(), GetColumns(), GetDimensions())

I've declared these const, as they don't change anything within the class.. but now that they're const I get unresolved external errors when I call them. Everything is fine until I try to call these functions, If I don't call them.. I can compile fine.

These are the errors I get:

Matrix.obj : error LNK2001: unresolved external symbol "public: double __thiscall CMatrix::GetSingle(unsigned short,unsigned short)" (?GetSingle@CMatrix@@QAENGG@Z)
Matrix.obj : error LNK2001: unresolved external symbol "public: short __thiscall CMatrix::GetColumns(void)" (?GetColumns@CMatrix@@QAEFXZ)
Matrix.obj : error LNK2001: unresolved external symbol "public: short __thiscall CMatrix::GetRows(void)" (?GetRows@CMatrix@@QAEFXZ)

Here's my main cpp file which tests some of the classes methods.

Code:

main.cpp
#include "stdafx.h"
#include "CMatrix.h"
#include <iostream>

int main(int argc, char* argv[])
{
	// Testing...
	using std::endl;
	CMatrix Matrix(5, 5);

	Matrix.SetSingle(3, 4, 4.302);
	Matrix.Redimension(6, 6);

	CMatrix CopyMatrix(6, 6);
	CopyMatrix.SetSingle(3, 4, 4.232);

	Matrix.Copy(CopyMatrix);

	Matrix.Clear();
	Matrix.Redimension(6, 6);

	Matrix.SetRow(1, 3.32, 4.32, 5.13, 6.75, 7.87, 6.55);

	for (int i = 0; i < Matrix.GetRows(); i++)
	{
		for (int ii = 0; ii < Matrix.GetColumns(); ii++)
		{
			std::cout << Matrix.GetSingle(i, ii) << endl;
		}
	}

			
	return 0;
}

The declarations of these methods in CMatrix.h

Code:

CMatrix.h
	double **GetMatrix() const;
	// Returns a pointer to an array of doubles, representing a matrix;

	double GetSingle(unsigned short int iRowNum, unsigned short int iColumnNum) const;
	// Retrives a single element from the matrix;


	void GetDimensions(short int &iRow, short int &iColumn) const;
	// Fills dColumn and dRow with dimension values;

	short GetColumns() const;
	// Returns the number of columns;

	short GetRows() const;

And the definitions of these methods in CMatrix.cpp

Code:

CMatrix.cpp
double CMatrix::GetSingle(unsigned short int iRowNum, unsigned short int iColumnNum) const
{
	if (m_pdMatrixData == NULL) return NULL;
	if (iRowNum > m_iDimension[0] || iRowNum < 1) return NULL;
	if (iRowNum > m_iDimension[1] || iRowNum < 1) return NULL;
	// Error Checking;

	return m_pdMatrixData[iRowNum][iColumnNum];
}


short CMatrix::GetRows() const
{
	if (m_pdMatrixData == NULL) return 0;

	return m_iDimension[0];
}

short CMatrix::GetColumns() const
{
	if (m_pdMatrixData == NULL) return 0;

	return m_iDimension[1];
}

void CMatrix::GetDimensions(short int &iRow, short int &iColumn) const
{
	if (m_pdMatrixData == NULL)
	{
		iRow = 0;
		iColumn = 0;
		return;
	}
	iRow = m_iDimension[0];
	iColumn = m_iDimension[1];
}

double **CMatrix::GetMatrix() const
{
	if (m_pdMatrixData == NULL) return NULL;
	return m_pdMatrixData;
}

These errors have been holding me back for almost a week, someone please help!

Didn't read your code but unresolved externals usually means that you don't have a need library included

Could you post the rest of CMatrix.cpp so the code can at least be compiled?

Sure. I'll upload my zipped project here.