⋕&sc &pf "Enter a width: "
⋕&sc &pf "Enter a height: "
˜↯0⊟     # create 2D array filled with 0
⍜⊡⋅3 1_2 # store 3 at row 1, col 2
⟜&s      # show array non-destructively
⊡1_2     # retrieve element at row 1, col 2
         # this also destroys the array