diff --git a/Makefile b/Makefile
index 1468660..5c0895e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 #    By: gbaconni@student.42lausanne.ch             +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2022/01/18 15:11:16 by gbaconni          #+#    #+#              #
-#    Updated: 2022/04/13 23:03:45 by gbaconni         ###   lausanne.ch        #
+#    Updated: 2022/04/15 00:01:26 by gbaconni         ###   lausanne.ch        #
 #                                                                              #
 # **************************************************************************** #
 #
@@ -44,6 +44,9 @@ RMFLAGS = -f
 
 VALGRIND = valgrind
 VALGRINDFLAGS = --quiet --leak-check=full --show-leak-kinds=all
+ifeq ($(DEBUG), 1)
+	PREFIX += $(VALGRIND) $(VALGRINDFLAGS)
+endif
 
 NORMINETTE = norminette
 NORMINETTEFLAGS = -o
@@ -76,28 +79,17 @@ fast:
 	@$(MAKE) re FAST=1
 
 test: clean $(NAME)
-	@./$(NAME) "%c" C || true
-	@./$(NAME) "%s" "42 Lausanne" || true
-	@./$(NAME) "%d" 42 || true
+	@$(PREFIX) ./$(NAME) "%c" C || true
+	@$(PREFIX) ./$(NAME) "%s" "42 Lausanne" || true
+	@$(PREFIX) ./$(NAME) "%d" 42 || true
+	@$(PREFIX) ./$(NAME) "%x" 42 || true
+	@$(PREFIX) ./$(NAME) "%X" 42 || true
 
-test2:
-ifneq ($(DEBUG), 1)
+test2: debug
 	@$(MAKE) test DEBUG=1
-endif
 
-test3:
-ifneq ($(FAST), 1)
+test3: fast
 	@$(MAKE) test FAST=1
-endif
-
-test4: clean $(NAME)
-ifneq ($(DEBUG), 1)
-	@$(MAKE) test4 DEBUG=1
-else
-	@$(VALGRIND) $(VALGRINDFLAGS) ./$(NAME) "%c" C || true
-	@$(VALGRIND) $(VALGRINDFLAGS) ./$(NAME) "%s" "42 Lausanne" || true
-	@$(VALGRIND) $(VALGRINDFLAGS) ./$(NAME) "%d" 42 || true
-endif
 
 update: config online pull
 
diff --git a/libftprintf/Makefile b/libftprintf/Makefile
index a043fd1..12593f7 100644
--- a/libftprintf/Makefile
+++ b/libftprintf/Makefile
@@ -6,7 +6,7 @@
 #    By: gbaconni@student.42lausanne.ch             +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2022/01/18 15:11:16 by gbaconni          #+#    #+#              #
-#    Updated: 2022/04/13 01:20:20 by gbaconni         ###   lausanne.ch        #
+#    Updated: 2022/04/14 23:54:03 by gbaconni         ###   lausanne.ch        #
 #                                                                              #
 # **************************************************************************** #
 #
@@ -30,6 +30,7 @@ SRC = \
 	  $(LIBFT)/ft_calloc.c \
 	  $(LIBFT)/ft_strlen.c \
 	  $(LIBFT)/ft_itoa.c \
+	  ft_itoa_base.c \
 	  ft_vprintf_char.c \
 	  ft_vprintf_string.c \
 	  ft_vprintf_pointer.c \
diff --git a/libftprintf/ft_itoa_base.c b/libftprintf/ft_itoa_base.c
new file mode 100644
index 0000000..7d49a62
--- /dev/null
+++ b/libftprintf/ft_itoa_base.c
@@ -0,0 +1,79 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itoa_base.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: gbaconni <gbaconni@42lausanne.ch>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/08/16 13:51:16 by gbaconni          #+#    #+#             */
+/*   Updated: 2022/04/15 00:08:27 by gbaconni         ###   lausanne.ch       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libftprintf.h"
+
+static int	ft_intlen_base(int n, int nbase);
+static char	*ft_strrev(char *s);
+
+char	*ft_itoa_base(int n, char *base)
+{
+	char	*s;
+	int		i;
+	long	nbr;
+	long	nbase;
+
+	nbase = ft_strlen(base);
+	s = (char *) ft_calloc((ft_intlen_base(n, nbase) + 1), sizeof(char));
+	if (s == NULL)
+		return (NULL);
+	i = 0;
+	nbr = n;
+	if (nbr == 0)
+		s[i++] = '0';
+	if (nbr < 0)
+		nbr = -nbr;
+	while (nbr > 0)
+	{
+		s[i++] = base[nbr % nbase];
+		nbr /= nbase;
+	}
+	if (n < 0)
+		s[i++] = '-';
+	s[i] = '\0';
+	return (ft_strrev(s));
+}
+
+static int	ft_intlen_base(int n, int nbase)
+{
+	size_t	len;
+
+	len = 0;
+	if (n < 0 || n == 0)
+		len++;
+	while (!(n < 1 && n > -1))
+	{
+		n /= nbase;
+		len++;
+	}
+	return (len);
+}
+
+static char	*ft_strrev(char *s)
+{
+	int		len;
+	int		i;
+	int		j;
+	char	c;
+
+	len = ft_strlen(s);
+	i = 0;
+	while (i < (len / 2))
+	{
+		j = len - 1 - i;
+		c = s[i];
+		s[i] = s[j];
+		s[j] = c;
+		i++;
+	}
+	return (s);
+}
diff --git a/libftprintf/ft_vprintf_decimal.c b/libftprintf/ft_vprintf_decimal.c
index bc8c3a1..b3b2f22 100644
--- a/libftprintf/ft_vprintf_decimal.c
+++ b/libftprintf/ft_vprintf_decimal.c
@@ -6,7 +6,7 @@
 /*   By: gbaconni@student.42lausanne.ch             +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/01/20 11:55:02 by gbaconni          #+#    #+#             */
-/*   Updated: 2022/04/12 23:51:56 by gbaconni         ###   lausanne.ch       */
+/*   Updated: 2022/04/14 21:49:13 by gbaconni         ###   lausanne.ch       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/libftprintf/ft_vprintf_hexadecimal.c b/libftprintf/ft_vprintf_hexadecimal.c
index 2725ff3..69ba0e8 100644
--- a/libftprintf/ft_vprintf_hexadecimal.c
+++ b/libftprintf/ft_vprintf_hexadecimal.c
@@ -6,7 +6,7 @@
 /*   By: gbaconni@student.42lausanne.ch             +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/01/20 11:55:33 by gbaconni          #+#    #+#             */
-/*   Updated: 2022/04/13 08:00:40 by gbaconni         ###   lausanne.ch       */
+/*   Updated: 2022/04/15 00:13:02 by gbaconni         ###   lausanne.ch       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,7 +14,22 @@
 
 int	ft_vprintf_hexadecimal(const char *format, va_list ap)
 {
-    (void) ap;
-    (void) format;
-    return (0);
+	int			ret;
+	int			len;
+	int			d;
+	char		*s;
+
+	(void) format;
+	ret = 0;
+	len = 0;
+	d = va_arg(ap, int);
+	if (format[0] == 'x')
+		s = ft_itoa_base(d, "0123456789abcdef");
+	else
+		s = ft_itoa_base(d, "0123456789ABCDEF");
+	len = ft_strlen(s);
+	write(1, s, len);
+	ret += len;
+	free(s);
+	return (ret);
 }
diff --git a/libftprintf/libftprintf.h b/libftprintf/libftprintf.h
index 9abea30..e1d20e2 100644
--- a/libftprintf/libftprintf.h
+++ b/libftprintf/libftprintf.h
@@ -6,7 +6,7 @@
 /*   By: gbaconni@student.42lausanne.ch             +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2022/01/18 15:26:06 by gbaconni          #+#    #+#             */
-/*   Updated: 2022/04/12 07:10:26 by gbaconni         ###   lausanne.ch       */
+/*   Updated: 2022/04/14 23:56:24 by gbaconni         ###   lausanne.ch       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,17 +17,21 @@
 # include <stdarg.h>
 # include <unistd.h>
 
+/* Helper */
+
+char	*ft_itoa_base(int n, char *base);
+
 /* Mandatory */
 
-int	ft_printf(const char *format, ...);
-int	ft_vprintf(char const *format, va_list ap);
-int	ft_vprintf_char(const char *format, va_list ap);
-int	ft_vprintf_string(const char *format, va_list ap);
-int	ft_vprintf_pointer(const char *format, va_list ap);
-int	ft_vprintf_decimal(const char *format, va_list ap);
-int	ft_vprintf_hexadecimal(const char *format, va_list ap);
-int	ft_vprintf_percent(const char *format, va_list ap);
-int	ft_vprintf_other(const char *format, va_list ap);
+int		ft_printf(const char *format, ...);
+int		ft_vprintf(char const *format, va_list ap);
+int		ft_vprintf_char(const char *format, va_list ap);
+int		ft_vprintf_string(const char *format, va_list ap);
+int		ft_vprintf_pointer(const char *format, va_list ap);
+int		ft_vprintf_decimal(const char *format, va_list ap);
+int		ft_vprintf_hexadecimal(const char *format, va_list ap);
+int		ft_vprintf_percent(const char *format, va_list ap);
+int		ft_vprintf_other(const char *format, va_list ap);
 
 /* Bonus */
 #endif