Re: what did I do wrong here ?

if a = 0 then a else a+ sum(a-1)



2014-10-14 19:09 GMT+02:00 Roelof Wobben [email protected] [ocaml_beginners]
<[email protected]>:

>
>
> it helps but still im a little bit confused.
>
> What I try to do it this :
>
> lets say I want to calculate this 1+2+3
> then first 2+3 must be calculated and the outcome will be 5
> then 5+1 must be calculated so the outcome will be 6.
>
> Now there are no arguments anymore so the outcome must be displayed.
>
> But if there are no arguments so sum  then the answer must be 0
>
> and I use this as a example and here a=  is used  : # let rec factorial a
> = if a = 1 then 1 else a * factorial (a - 1);;
>
> Roelof
>
>
>
> Matthieu Dubuget [email protected] [ocaml_beginners] schreef op
> 14-10-2014 18:49:
>
>
>
>  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) toawith 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
>
>
>  
>



-- 
Alexandre