diff --git a/ex01/Makefile b/ex01/Makefile
new file mode 100644
index 0000000..d6db729
--- /dev/null
+++ b/ex01/Makefile
@@ -0,0 +1,60 @@
+# **************************************************************************** #
+#                                                                              #
+#                                                         :::      ::::::::    #
+#    Makefile                                           :+:      :+:    :+:    #
+#                                                     +:+ +:+         +:+      #
+#    By: adjoly <adjoly@student.42angouleme.fr>     +#+  +:+       +#+         #
+#                                                 +#+#+#+#+#+   +#+            #
+#    Created: 2024/10/25 16:09:27 by adjoly            #+#    #+#              #
+#    Updated: 2025/06/03 11:58:38 by adjoly           ###   ########.fr        #
+#                                                                              #
+# **************************************************************************** #
+
+SHELL = bash
+
+NAME = RPN
+
+CC = clang++
+
+OBJSDIR = obj/
+
+SRCS = $(shell find . -name '*.cpp')
+
+OBJS = $(addprefix $(OBJSDIR), $(SRCS:.cpp=.o))
+
+FLAGS = -Wall -Werror -Wextra -std=c++98 -MMD -MP
+
+RED = \033[0;31m
+GREEN = \033[0;32m
+YELLOW = \033[1;33m
+PURPLE = \e[0;35m
+NC = \033[0m
+DELETE = \x1B[2K\r
+
+ifeq ($(VERBOSE),true)
+	FLAGS += -D VERBOSE
+endif
+
+all: $(NAME)
+
+$(NAME): $(OBJS)
+	@$(CC) $(FLAGS) -I . $(OBJS) -o $(NAME)
+	@printf "$(YELLOW)「✨」($(NAME)) Program compiled\n"
+
+$(OBJSDIR)%.o: %.cpp
+	@mkdir -p $(@D)
+	@$(CC) $(FLAGS) -I . -c $< -o $@
+	@printf "$(DELETE)$(GREEN)「🔨」($<) Object compiled\n"
+
+clean:
+	@rm -f $(OBJS)
+	@printf "$(DELETE)$(RED)「🗑️」($(OBJS)) Object deleted\n"
+
+fclean: clean
+	@rm -f $(NAME)
+	@rm -Rf $(OBJSDIR)
+	@printf "$(RED)「🗑️」($(NAME)) Program deleted\n"
+
+re: fclean all
+
+.PHONY: clean fclean all re
diff --git a/ex01/RPN b/ex01/RPN
new file mode 100755
index 0000000..1dbfd7c
Binary files /dev/null and b/ex01/RPN differ
diff --git a/ex01/RPN.cpp b/ex01/RPN.cpp
new file mode 100644
index 0000000..93851c0
--- /dev/null
+++ b/ex01/RPN.cpp
@@ -0,0 +1,77 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   RPN.cpp                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42angouleme.fr>     +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/06/03 12:07:59 by adjoly            #+#    #+#             */
+/*   Updated: 2025/06/03 15:56:22 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <RPN.hpp>
+#include <cctype>
+#include <exception>
+#include <sstream>
+#include <stack>
+#include <stdexcept>
+
+int add(int first, int second) { return first + second; }
+int subst(int first, int second) { return first + second; }
+int mult(int first, int second) { return first * second; }
+int div(int first, int second) {
+	if (second == 0)
+		throw std::invalid_argument("can't divide by 0 sorry D:");
+	return first / second;
+}
+
+void calc(int calc(int, int), std::string::const_iterator ,
+		  std::stack<int> &stack) {
+	int first, second;
+
+	if (stack.size() != 2)
+		throw std::range_error("need 2 at least two number");
+	second = stack.top();
+	stack.pop();
+	first = stack.top();
+	stack.pop();
+	if (stack.size() != 0)
+		throw std::range_error("too much number");
+	stack.push(calc(first, second));
+	// if (*(c + 1) != ' ' || *(c + 1) != '\0')
+	// 	throw std::invalid_argument("");
+}
+
+void handle(std::string::const_iterator c, std::stack<int> &stack) {
+	if (*c == ' ')
+		return;
+	else if (std::isdigit(*c))
+		stack.push(*c - '0');
+	else if (*c == '+')
+		calc(add, c, stack);
+	else if (*c == '-')
+		calc(subst, c, stack);
+	else if (*c == '*')
+		calc(mult, c, stack);
+	else if (*c == '/')
+		calc(div, c, stack);
+	else
+		throw std::invalid_argument("invalid caracter detected");
+}
+
+void rpn(char *av) {
+	std::string		str(av);
+	std::stack<int> stack;
+
+	for (auto it = range(str)) {
+		try {
+			handle(it, stack);
+		} catch (std::exception &e) {
+			std::stringstream str;
+			str << "Error: " << e.what() << " : " << *it;
+			throw std::runtime_error(str.str());
+		}
+	}
+	std::cout << stack.top() << std::endl;
+}
diff --git a/ex01/RPN.hpp b/ex01/RPN.hpp
new file mode 100644
index 0000000..139a539
--- /dev/null
+++ b/ex01/RPN.hpp
@@ -0,0 +1,30 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   RPN.hpp                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42angouleme.fr>     +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/06/03 12:00:35 by adjoly            #+#    #+#             */
+/*   Updated: 2025/06/03 12:09:55 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#pragma once
+
+#include <string>
+#include <iostream>
+#include <stack>
+
+#define range(x)                                                               \
+	x.begin();                                                                 \
+	it != x.end();                                                             \
+	it++
+
+#define auto __auto_type
+
+typedef unsigned int   uint32_t;
+typedef unsigned short uint16_t;
+
+
+void rpn(char *);
diff --git a/ex01/main.cpp b/ex01/main.cpp
new file mode 100644
index 0000000..a9386dc
--- /dev/null
+++ b/ex01/main.cpp
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   main.cpp                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42angouleme.fr>     +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/06/03 11:58:43 by adjoly            #+#    #+#             */
+/*   Updated: 2025/06/03 15:54:55 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <RPN.hpp>
+#include <exception>
+
+int main(int ac, char **av) {
+	if (ac > 1 && ac < 3) {
+		try {
+			rpn(av[1]);
+		} catch(std::exception &e) {
+			std::cerr << e.what() << std::endl;
+		}
+	} else {
+		std::cerr << "Error" << std::endl;
+	}
+}