diff --git a/Makefile b/Makefile
index d456727..6450e51 100755
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,8 @@ SRCS		=	ft_isalpha.c ft_isdigit.c ft_isascii.c ft_isprint.c ft_isalnum.c \
 	ft_strnstr.c ft_strdup.c ft_toupper.c ft_tolower.c ft_atoi.c ft_bzero.c \
 	ft_memset.c ft_memchr.c ft_memcpy.c ft_memcmp.c ft_memmove.c ft_calloc.c \
 	ft_substr.c ft_strjoin.c ft_strtrim.c ft_split.c ft_itoa.c ft_strmapi.c \
-	ft_striteri.c ft_putchar_fd.c ft_putnbr_fd.c ft_putendl_fd.c ft_putstr_fd.c
+	ft_striteri.c ft_putchar_fd.c ft_putnbr_fd.c ft_putendl_fd.c ft_putstr_fd.c \
+	ft_nbrlen.c ft_strrev.c ft_itox.c ft_utoa.c
 
 SRCS_BONUS	=	ft_lstsize_bonus.c ft_lstnew_bonus.c ft_lstlast_bonus.c \
 	ft_lstadd_back_bonus.c ft_lstadd_front_bonus.c ft_lstdelone_bonus.c \
diff --git a/ft_itoa.c b/ft_itoa.c
index f2d5f2b..b12d950 100755
--- a/ft_itoa.c
+++ b/ft_itoa.c
@@ -6,45 +6,12 @@
 /*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/20 15:50:47 by narnaud           #+#    #+#             */
-/*   Updated: 2021/11/15 12:10:47 by narnaud          ###   ########.fr       */
+/*   Updated: 2021/12/21 09:59:19 by narnaud          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "libft.h"
 
-static void	ft_strrev(char **str, unsigned int neg)
-{
-	char	ch;
-	size_t	size;
-	size_t	i;
-
-	size = ft_strlen(*str);
-	if (neg)
-		(*str)[size++] = '-';
-	i = 0;
-	while (i < size / 2)
-	{
-		ch = (*str)[i];
-		(*str)[i] = (*str)[size - i - 1];
-		(*str)[size - i - 1] = ch;
-		i++;
-	}
-}
-
-static size_t	get_nbrlength(int nbr)
-{
-	size_t	i;
-
-	i = 0;
-	if (nbr == 0)
-		return (1);
-	else if (nbr < 0)
-		i++;
-	while (nbr && ++i)
-		nbr = nbr / 10;
-	return (i);
-}
-
 char	*ft_itoa(int n)
 {
 	char			*ret;
@@ -57,7 +24,7 @@ char	*ft_itoa(int n)
 		return (ft_strdup("0"));
 	i = 0;
 	neg = 0;
-	ret = ft_calloc(get_nbrlength(n) + 1, sizeof(char));
+	ret = ft_calloc(ft_ilen(n) + 1, sizeof(char));
 	if (!ret)
 		return (NULL);
 	if (n < 0)
diff --git a/ft_itox.c b/ft_itox.c
new file mode 100644
index 0000000..2e7cd33
--- /dev/null
+++ b/ft_itox.c
@@ -0,0 +1,35 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itox.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/21 09:51:26 by narnaud           #+#    #+#             */
+/*   Updated: 2021/12/21 09:56:39 by narnaud          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_itox(unsigned long int n, const char *base)
+{
+	char			*ret;
+	size_t			i;
+	unsigned int	neg;
+	size_t			size;
+
+	size = ft_longbaselen(n, 16);
+	if (n == 0)
+		return (ft_strdup("0"));
+	i = 0;
+	neg = 0;
+	ret = ft_calloc(size + 1, sizeof(char));
+	while (n)
+	{
+		ret[i++] = base[n % 16];
+		n = n / 16;
+	}
+	ft_strrev(&ret, neg);
+	return (ret);
+}
diff --git a/ft_nbrlen.c b/ft_nbrlen.c
new file mode 100644
index 0000000..4e7d354
--- /dev/null
+++ b/ft_nbrlen.c
@@ -0,0 +1,50 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_nbrlen.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/21 09:42:43 by narnaud           #+#    #+#             */
+/*   Updated: 2021/12/21 09:53:16 by narnaud          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+size_t	ft_ilen(int nbr)
+{
+	size_t	i;
+
+	i = 0;
+	if (nbr == 0)
+		return (1);
+	else if (nbr < 0)
+		i++;
+	while (nbr && ++i)
+		nbr = nbr / 10;
+	return (i);
+}
+
+size_t	ft_ulen(unsigned int nbr)
+{
+	size_t	i;
+
+	i = 0;
+	while (nbr && ++i)
+		nbr = nbr / 10;
+	return (i);
+}
+
+size_t	ft_longbaselen(long nbr, size_t base)
+{
+	size_t	i;
+
+	if (nbr <= 0)
+		i = 1;
+	else
+		i = 0;
+	while (nbr && ++i)
+		nbr = nbr / base;
+	return (i);
+}
diff --git a/ft_strrev.c b/ft_strrev.c
new file mode 100644
index 0000000..a8ea60d
--- /dev/null
+++ b/ft_strrev.c
@@ -0,0 +1,32 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrev.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/10/27 09:36:21 by narnaud           #+#    #+#             */
+/*   Updated: 2021/10/27 09:52:46 by narnaud          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	ft_strrev(char **str, unsigned int neg)
+{
+	char	ch;
+	size_t	size;
+	size_t	i;
+
+	size = ft_strlen(*str);
+	if (neg)
+		(*str)[size++] = '-';
+	i = 0;
+	while (i < size / 2)
+	{
+		ch = (*str)[i];
+		(*str)[i] = (*str)[size - i - 1];
+		(*str)[size - i - 1] = ch;
+		i++;
+	}
+}
diff --git a/ft_utoa.c b/ft_utoa.c
new file mode 100644
index 0000000..d252336
--- /dev/null
+++ b/ft_utoa.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   utoa.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/12/21 09:48:38 by narnaud           #+#    #+#             */
+/*   Updated: 2021/12/21 09:49:12 by narnaud          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_utoa(unsigned int n)
+{
+	char			*ret;
+	unsigned int	i;
+
+	if (n == 4294967295)
+		return (ft_strdup("4294967295"));
+	if (n == 0)
+		return (ft_strdup("0"));
+	i = 0;
+	ret = ft_calloc(ft_ulen(n) + 1, sizeof(char));
+	while (n)
+	{
+		ret[i++] = (n % 10) + '0';
+		n = n / 10;
+	}
+	ft_strrev(&ret, 0);
+	return (ret);
+}
diff --git a/libft.h b/libft.h
index 80e1963..6a28c66 100755
--- a/libft.h
+++ b/libft.h
@@ -6,7 +6,7 @@
 /*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/10/19 14:42:45 by narnaud           #+#    #+#             */
-/*   Updated: 2021/11/15 13:07:44 by narnaud          ###   ########.fr       */
+/*   Updated: 2021/12/21 10:02:24 by narnaud          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -35,6 +35,9 @@ void	*ft_memchr(const void *b, int c, size_t n);
 int		ft_memcmp(const void *s1, const void *s2, size_t n);
 void	*ft_memcpy(void *dst, const void *src, size_t n);
 void	*ft_memmove(void *dst, const void *src, size_t n);
+size_t	ft_ilen(int nbr);
+size_t	ft_ulen(unsigned int nbr);
+size_t	ft_longbaselen(long nbr, size_t base);
 void	*ft_memset(void *b, int c, size_t len);
 char	*ft_strchr(const char *s, int c);
 char	*ft_strdup(const char *src);
@@ -44,6 +47,7 @@ size_t	ft_strlen(const char *s);
 int		ft_strncmp(const char *s1, const char *s2, size_t n);
 char	*ft_strnstr(const char *haystack, const char *needle, size_t len);
 char	*ft_strrchr(const char *s, int c);
+void	ft_strrev(char **str, unsigned int neg);
 int		ft_tolower(int c);
 int		ft_toupper(int c);
 char	*ft_substr(char const *s, unsigned int start, size_t len);
@@ -51,6 +55,8 @@ char	*ft_strjoin(const char *s1, const char *s2);
 char	*ft_strtrim(char const *s1, char const *set);
 char	**ft_split(char const *str, char ch);
 char	*ft_itoa(int n);
+char	*ft_itox(unsigned long n, const char *base);
+char	*ft_utoa(unsigned int n);
 char	*ft_strmapi(char const *s, char (*f)(unsigned int, char));
 void	ft_striteri(char *s, void (*f)(unsigned int, char*));
 void	ft_putchar_fd(char c, int fd);