Program MATMUL multiplies matrices of fixed size (3 rows, 4
columns; 4 rows, 2 columns). Make the program deal with any specified
sizes up to an arbitrary 50 by 50.
Read three sizes: the number of rows of A, the number of columns of A (implying also the number of rows of B), the number of columns of B. Read A and B by rows, then print C by rows. For this exercise you have to change each simple reading loop to a nested pair of loops. Similarly the printing loop.