let test1 = 2 in
let _ = print test1 in
let test2 = fun y -> ( fun x -> x + y + 3) in
let _ = print ((test2 test1) test1) in
let rec test_f1 = fun y -> ((y - 2)*3)/3 in
let _ = print (test_f1 4) in
let _ = ifzero 0 then print 5 else print 1 in
let test_if = ifzero 1 then fun x -> x +1 else fun y -> y+2
in
let _ = print (test_if 3) in
let rec test_frec1 = fun x ->
(ifzero x then test_frec1 (x-1) else print 2)
in
let _ = print (test_frec1 5) in
print (print 5)