main.cpp

#include <iostream>
#include "matrix.h"

int main(){
	
	matrixObject A(10,10, 0);
	
	std::cout << A.matrix[5][5] << std::endl;
	

}

matrix.cpp

#include "matrix.h"

#include <iostream>

matrixObject::matrixObject(int h1, int w1){
	
	//Sets size
	height = h1;
	width = w1;
	
	//Creates number matrix
	double** matrix = new double*[width];
	for (int i = 0; i < width; i++) matrix[i] = new double[height];

}

matrixObject::matrixObject(int h1, int w1, double k){
	
	//Sets size
	height = h1;
	width = w1;

	//Creates number matrix
	double** matrix = new double*[width];
	for (int i = 0; i < width; i++) matrix[i] = new double[height];

	//Initializes numbers
	for(int i = 0; i < width; i++){
		for (int q = 0; q < height; q++){
			matrix[i][q] = k;
		}
	}

}

matrixObject::~matrixObject(){
	
	for (int i = 0; i < width; i++) delete[] matrix[i];
	delete[] matrix;
}

matrix.h

struct matrixObject{

	//Data
	int height;
	int width;
	double** matrix;

	//Constructors
	matrixObject(int h1, int w1);
	matrixObject(int h1, int w1, double k);

	//Destructor
	~matrixObject();
	
};