$1.$ Download files matrix.h$,$ matrix.cpp$,$ and lab$5$ExD.cpp$,$ from D$2$L$.$

$2.$ Read these files carefully to understand how the class Matrix dynamically allocates memory for an arrayof$-$pointers called matrixM. Each element of this array is supposed to point to a dynamically allocated array

of doubles.

$5$

The class Matrix also contains the following private data members:

rowsM: which holds the number of rows in a matrix object

colsM: which holds the number of columns in a matrix object

sum$\_$rowsM: is a pointer to double that is supposed to point to an array which is used for storing the sum of

the values in each row of the matrix.

sum$\_$colsM: is a pointer to double that is supposed to point to an array which is used for storing the sum of

the values in each column of the matrix.

$3.$ Compile the program using the following command: