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Algo/Séminaire/Chapter 5 - Recursivity.md

@@ -94,3 +94,11 @@ val add : int -> bool = <fun>
 val even : int -> bool = <fun>
 ```
 
+An accumulator is a thing that try to get our result. In CAML we trying to not use an accumulator in our program. In CAML the syntax for the accumulator (`inv`) is: (exemple with reverse_int exercise. See 4.9 - b)
+```Ocaml
+# let reverse_int =
+	let rec rev inv = function
+		| 0 -> inv
+		| n -> rev (inv*10 + n mod 10)(n/10)
+	in rev 0 n;;
+```