Re: what did I do wrong here ?

Le 14/10/2014 18:33, Roelof Wobben [email protected] [ocaml_beginners] a 
écrit :

> let rec sum a = if a = 0 then a = a + 0 else a = a + sum (a - 1) ;; 

The two branches of your if structure are tests :

  * |a = a + 0| which is |true|
  * and |a = a + sum (a - 1)|

So. |sum| should return a |bool|, right ?

But in the same time, you are using |sum| as if it would return an int, 
since you add |sum(a - 1) to|a|with the|+` function that takes to ints 
and returns an int.

Just get rid of the |a =|: the result of the function is either the true 
branch of the if test, or the false branch.

Hoping this will help.

​

-- 
Matthieu Dubuget
Guide d’autodéfense numérique : http://guide.boum.org