Matrix, C++ (gcc) - rextester

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

class matrix
{
	int r;
	int c;
	int **a;

public:
		matrix(int,int); //constuctor
		matrix(const matrix&); //constructor to copy a matrix
		~matrix(); //destructor

//operator overloads
		matrix operator=(const matrix&);
		matrix operator+(const matrix&);
		matrix operator*(const matrix&);
		matrix operator+(const matrix&);
        void setValue(int r, int c);
		int getValue(int r, int c);
};

matrix::matrix(int row, int col)
{
    r=row;
    c=col;
    a=new int*[r];
    
    for(int i=0;i<r;i++)
    {
        a[i]=new int*[c];
        for(int j=0;j<c;j++)
        {
            a[i][j]=0;
        }
    }
};

matrix::matrix(const matrix& m1)
{
    r=m1.r;
    c=m2.c;
    
    a=new int*[r];
    for(int i=0;i<r;i++)
    {
        a[i]=new int*[c];
        for(int j=0;j<c;j++)
        {
            a[i][j]=m1.a[i][j];
        }
    }
}
matrix::~matrix()
{
    for(int i=0;i<r;i++) delete[] a[i];
    delete a[];
}
void matrix::setElement(int r, int c, int e)
{
	array[r][c] = e;
}
int matrix::getValue(int r, int c)
{
	return array[r][c];
}
matrix matrix::operator=(const matrix& m1)
{
    matrix m(r,c);
	for (int i=0; i<row; i++)
    {
		for (int j=0; j<col; j++)
        {
            m.a[i][j]=m1.a[i][j];
        }
    }
    return m;
}

matrix matrix::operator+(const matrix& m1)
{
    matrix m(r,c);
	for (int i=0; i<row; i++)
    {
		for (int j=0; j<col; j++)
        {
            m.a[i][j]=m1.a[i][j]+a[i][j];
        }
    }
    return m;
}

matrix matrix::operator-(const matrix& m1)
{
    matrix m(r,c);
	for (int i=0; i<row; i++)
    {
		for (int j=0; j<col; j++)
        {
            m.a[i][j]=a[i][j]-m1[i][j];
        }
    }
    return m;
}

matrix matrix::operator*(const matrix& m)
{
	matrix m(row,col);
	for (int i=0; i<row; i++)
    {  
        for (int j=0; j<col; j++)
        { 
            for(int k = 0; k < col; ++k)
            {
                m.a[i][j] += a[i][k] * m.a[k][j];
            }
		}
	}
	return m;
}

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Compilation time: 0.13 sec, absolute service time: 0,21 sec