Homework from programming language processor class... I really need help... Thank you very much

clear version

var i, a[10]; % ./plod array.pl ; start compilation start execution begin 1 :- 9; while i >= 0 do begin a[i] - i. i; 1:- i - 1; end; 1 :- 0; while i = 0 do begin a[i] - i. i; 1:- i - 1; end; 1 :- 0; while i