diff --git a/ex04/ft_is_negative.c b/ex04/ft_is_negative.c
new file mode 100644
index 0000000..a3b7f2d
--- /dev/null
+++ b/ex04/ft_is_negative.c
@@ -0,0 +1,35 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_print_reverse_alphabet.c                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/03/15 21:50:37 by tischmid          #+#    #+#             */
+/*   Updated: 2023/03/16 05:00:01 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <unistd.h>
+
+void	ft_is_negative(int n)
+{
+	if (n < 0)
+	{
+		write(1, "N", 1);
+	}
+	else
+	{
+		write(1, "P", 1);
+	}
+}
+
+/* ////
+int	main(void)
+{
+	ft_is_negative(5);
+	ft_is_negative(0);
+	ft_is_negative(-5);
+	return (0);
+}
+*/ ////