Introduction - If you have any usage issues, please Google them yourself
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Class name: Matrix
Data members: row number, column number, matrix array (or pointer).
Include functions: 1) construct and copy constructors and destructors.
2) display the content of the matrix;
3) modify the value of a location in a matrix (location as a parameter).
4) we need to find the sum of a row in a matrix.
5) find the sum of a column in a matrix.
6) the maximum and minimum value in the matrix;
7) test in the main function;