From 1458548d67805e4e0811070d8852a4b302314567 Mon Sep 17 00:00:00 2001
From: yosyo <contact@y-syo.me>
Date: Wed, 27 Aug 2025 15:58:23 +0200
Subject: [PATCH] =?UTF-8?q?=E3=80=8C=E2=9C=A8=E3=80=8D=20feat(ex01):=20RPN?=
 =?UTF-8?q?=20is=20working=20:D?=
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---
 ex00/BitcoinExchange.hpp |  2 ++
 ex01/Makefile            | 58 ++++++++++++++++++++++++++++++++++++++++
 ex01/RPN.cpp             | 55 +++++++++++++++++++++++++++++++++++++
 ex01/RPN.hpp             |  9 +++++++
 ex01/main.cpp            | 21 +++++++++++++++
 5 files changed, 145 insertions(+)
 create mode 100644 ex01/Makefile
 create mode 100644 ex01/RPN.cpp
 create mode 100644 ex01/RPN.hpp
 create mode 100644 ex01/main.cpp

diff --git a/ex00/BitcoinExchange.hpp b/ex00/BitcoinExchange.hpp
index 6ac2700..8a9f2b5 100644
--- a/ex00/BitcoinExchange.hpp
+++ b/ex00/BitcoinExchange.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <exception>
 #include <iostream>
 #include <fstream>
diff --git a/ex01/Makefile b/ex01/Makefile
new file mode 100644
index 0000000..0c23ed6
--- /dev/null
+++ b/ex01/Makefile
@@ -0,0 +1,58 @@
+# **************************************************************************** #
+#                                                                              #
+#                                                         :::      ::::::::    #
+#    Makefile                                           :+:      :+:    :+:    #
+#                                                     +:+ +:+         +:+      #
+#    By: mmoussou <mmoussou@student.42angouleme.fr  +#+  +:+       +#+         #
+#                                                 +#+#+#+#+#+   +#+            #
+#    Created: 2024/01/22 07:21:18 by mmoussou          #+#    #+#              #
+#    Updated: 2025/08/27 14:42:13 by mmoussou         ###   ########.fr        #
+#                                                                              #
+# **************************************************************************** #
+
+SHELL = bash
+
+RED = \033[0;31m
+GREEN = \033[0;32m
+YELLOW = \033[1;33m
+PURPLE = \e[0;35m
+NC = \033[0m
+DELETE = \x1B[2K
+
+CXX = c++
+
+FLAGS = -std=c++98 -Wall -Werror -Wextra
+
+INCLUDES = .
+
+NAME = RPN
+
+SRCS = main.cpp RPN.cpp
+
+OBJSDIR = obj/
+OBJS = $(addprefix $(OBJSDIR), $(SRCS:.cpp=.o))
+
+all: $(NAME)
+
+$(NAME): $(OBJS)
+	@$(CXX) $(FLAGS) -I$(INCLUDES) $(OBJS) -o $(NAME)
+	@printf "$(NC)$(YELLOW)「✨」 feat($(NAME)): program compiled\n$(NC)"
+
+$(OBJSDIR)%.o: %.cpp
+	@mkdir -p $(@D)
+	@$(CXX) $(FLAGS) -I$(INCLUDES) -c $< -o $@
+	@printf "$(NC)$(GREEN)「🔨」 build($<): object compiled\n$(NC)"
+
+clean:
+	@rm -f $(OBJS)
+	@printf "$(NC)$(RED)「🗑️」 clean($(OBJS)): object deleted\n$(NC)"
+
+fclean: clean
+	@rm -f $(NAME)
+	@rm -Rf $(OBJSDIR)
+	@printf "$(NC)$(RED)「🗑️」 fclean($(NAME)): program deleted\n$(NC)"
+
+re: fclean
+	@$(MAKE) -s all
+
+.PHONY: clean fclean all re
diff --git a/ex01/RPN.cpp b/ex01/RPN.cpp
new file mode 100644
index 0000000..ca35609
--- /dev/null
+++ b/ex01/RPN.cpp
@@ -0,0 +1,55 @@
+#include "RPN.hpp"
+
+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("division by 0 is not possible");
+	return first / second;
+}
+
+
+typedef int (*OperatorFunctions)(int, int);
+
+void rpn(char *av)
+{
+	OperatorFunctions calc[128] = { NULL };
+	calc['+'] = &add;
+	calc['-'] = &subst;
+	calc['*'] = &mult;
+	calc['/'] = &div;
+
+	std::istringstream	ss_input((std::string(av)));
+	std::stack<int>		stack;
+
+	std::string value;
+
+	while (ss_input >> value)
+	{
+		if (value.size() != 1)
+			throw std::invalid_argument("invalid value");
+
+		if (isdigit(value[0]))
+		{
+			stack.push(value[0] - '0');
+			continue ;
+		}
+
+		if (!calc[(int) value[0]])
+			throw std::invalid_argument("invalid character");
+
+		if (stack.size() < 2)
+			throw std::range_error("not enough operands");
+
+		int a = stack.top(); stack.pop();
+		int b = stack.top(); stack.pop();
+		stack.push(calc[(int) value[0]](b, a));
+	}
+
+	if (stack.size() != 1)
+		throw std::range_error("there are too many operands");
+
+	std::cout << stack.top() << std::endl;
+}
+
diff --git a/ex01/RPN.hpp b/ex01/RPN.hpp
new file mode 100644
index 0000000..1031e5d
--- /dev/null
+++ b/ex01/RPN.hpp
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <exception>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <stack>
+
+void rpn(char *);
diff --git a/ex01/main.cpp b/ex01/main.cpp
new file mode 100644
index 0000000..68348b2
--- /dev/null
+++ b/ex01/main.cpp
@@ -0,0 +1,21 @@
+#include "RPN.hpp"
+
+int main(int ac, char **av)
+{
+	if (ac == 2)
+	{
+		try
+		{
+			rpn(av[1]);
+		}
+		catch(std::exception &e)
+		{
+			std::cerr << e.what() << std::endl;
+		}
+	}
+	else
+	{
+		std::cerr << "Error: wrong usage." << std::endl;
+	}
+}
+