type coordonnee = float * float;;

type logarithme = Ln of float;;

type compte_en_banque = {nom : string; mutable solde : float};;

let ex1 = {nom = "toto"; solde = 100.0};;

(*Ajouter 20 sur le solde de toto*)
let ajouter_solde c s = c.solde <- c.solde +. s;;

ajouter_solde ex1 20.0;;

(*Retirer 20 sur le solde de toto*)

type 'a pile = PileVide | Ajout of 'a * 'a pile;;

let pile1 = Ajout(1, Ajout(2, Ajout(3, PileVide)));;

let rec somme_pile p = match p with
  | PileVide -> 0
  | Ajout(x, p') -> x + somme_pile p';;