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diff --git a/c05/ex04/ft_fibonacci.c b/c05/ex04/ft_fibonacci.c
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+/* ************************************************************************** */
+/* */
+/* ::: :::::::: */
+/* ft_fibonacci.c :+: :+: :+: */
+/* +:+ +:+ +:+ */
+/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
+/* +#+#+#+#+#+ +#+ */
+/* Created: 2019/07/06 19:34:02 by cacharle #+# #+# */
+/* Updated: 2019/07/06 19:37:37 by cacharle ### ########.fr */
+/* */
+/* ************************************************************************** */
+
+int ft_fibonacci(int index)
+{
+ if (index < 0)
+ return (-1);
+ if (index == 0)
+ return (0);
+ if (index == 1 || index == 2)
+ return (1);
+ return ft_fibonacci(index - 1) + ft_fibonacci(index - 2);
+}