let factorielle1 n = 
  let p = ref 1 in
  for i = 1 to n do
    p := !p * i
  done;
  !p
;;

factorielle1 5;;


let maximum t = let max = ref 0 in
  for i = 0 to Array.length t - 1 do
    if t.(i) > !max then max := t.(i)
  done;
  !max
;;

let recherche t x = let n = Array.length t and i = ref 0 in
  while !i < n && t.(!i) <> x do
    i := !i + 1
  done;
  !i < n
;;

let rec factorielle2 n = if n = 0 then 1 else n * factorielle2 (n - 1);;

let rec pgcd a b = if b = 0 then a else pgcd b (a mod b);;

let min3 a b c = if a <= b && a <= c then a else if b <= a && b <= c then b else c;;

let puissance x n = let p = ref 1 in
  for k = 1 to n do
    p := !p * x
  done;
  !p
;;