diff --git a/ex01/Makefile b/ex01/Makefile
new file mode 100644
index 0000000..919ddf8
--- /dev/null
+++ b/ex01/Makefile
@@ -0,0 +1,42 @@
+NAME = iter
+
+SRC = main.cpp \
+
+OBJ = $(SRC:.cpp=.o)
+
+CC = c++
+CFLAGS = -Wall -Wextra -Werror -std=c++98
+
+GREEN = \033[0;32m
+RED   = \033[0;31m
+RESET = \033[0m
+
+TOTAL := $(words $(SRC))
+COUNT = 0
+
+all: $(NAME)
+
+$(NAME): $(OBJ)
+	@rm -f .build_start
+	@$(CC) $(CFLAGS) $(OBJ) -o $(NAME)
+	@printf "\n$(GREEN)✔ Listo (100%%)\n$(RESET)"
+
+%.o: %.cpp
+	@if [ ! -f .build_start ]; then printf "$(GREEN)Compilando archivos...\n$(RESET)"; touch .build_start; fi
+	@$(eval COUNT = $(shell echo $$(($(COUNT)+1))))
+	@PERCENT=$$(($(COUNT)*100/$(TOTAL))); \
+	BAR=$$(printf "%0.s#" $$(seq 1 $$((PERCENT/5)))); \
+	SPACE=$$(printf "%0.s " $$(seq 1 $$((20-PERCENT/5)))); \
+	printf "\r  [$$BAR$$SPACE] %3d%% (%d/%d) $<     " $$PERCENT $(COUNT) $(TOTAL)
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	@printf "$(RED)Eliminando...\n$(RESET)"
+	@rm -f $(OBJ)
+
+fclean: clean
+	@rm -f $(NAME)
+
+re: fclean all
+
+.PHONY: all clean fclean re
diff --git a/ex01/iter.hpp b/ex01/iter.hpp
new file mode 100644
index 0000000..43ee018
--- /dev/null
+++ b/ex01/iter.hpp
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   iter.hpp                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: aortigos <aortigos@student.42malaga.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/03/21 15:53:06 by aortigos          #+#    #+#             */
+/*   Updated: 2026/03/21 16:58:31 by aortigos         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef ITER_HPP
+
+# define ITER_HPP
+
+# include <iostream>
+# include <cctype>
+
+template <typename PTR, typename F>
+void	iter(PTR *address, size_t const lenght, F func)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < lenght)
+	{
+		func(address[i]);
+		i++;
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/ex01/main.cpp b/ex01/main.cpp
new file mode 100644
index 0000000..03941a9
--- /dev/null
+++ b/ex01/main.cpp
@@ -0,0 +1,64 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   main.cpp                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: aortigos <aortigos@student.42malaga.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/03/21 16:57:02 by aortigos          #+#    #+#             */
+/*   Updated: 2026/03/21 16:57:36 by aortigos         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "iter.hpp"
+
+template <typename T>
+void printElement(const T& elem)
+{
+    std::cout << elem << " ";
+}
+
+void toUpper(std::string& str)
+{
+    for (size_t i = 0; i < str.length(); i++)
+        str[i] = std::toupper(str[i]);
+}
+
+void increment(int& x)
+{
+    x++;
+}
+
+int main()
+{
+    // -------- STRING ARRAY --------
+    std::string words[] = {"hola", "mundo", "iter"};
+    size_t wordsLen = sizeof(words) / sizeof(words[0]);
+
+    std::cout << "Original strings: ";
+    iter(words, wordsLen, printElement<std::string>);
+    std::cout << std::endl;
+
+    iter(words, wordsLen, toUpper);
+
+    std::cout << "Uppercase strings: ";
+    iter(words, wordsLen, printElement<std::string>);
+    std::cout << std::endl;
+
+
+    // -------- INT ARRAY --------
+    int numbers[] = {1, 2, 3, 4};
+    size_t numLen = sizeof(numbers) / sizeof(numbers[0]);
+
+    std::cout << "\nOriginal ints: ";
+    iter(numbers, numLen, printElement<int>);
+    std::cout << std::endl;
+
+    iter(numbers, numLen, increment);
+
+    std::cout << "Incremented ints: ";
+    iter(numbers, numLen, printElement<int>);
+    std::cout << std::endl;
+
+    return 0;
+}