Consider the following program in Pseudo-Pascal syntax.

program what:

      var z: integer
       procedure recur(x):
       begin if x <= 40 then
                  begin x:x+z
                     recur(x);
                     z:=x+10
                  end
       end(*recur*)
   begin(*what*)
       z=10;
       recur(z);
       writeln(z)
   end 

(a) Suppose the parameter to the procedure ‘recur’ is passed by value.

i. What value is printed by program?

ii. How many times is ‘recur’ called?
(b) What value is printed by the program if the parameter is passed by reference?