diff --git a/ex03/ft_atoi.c b/ex03/ft_atoi.c
new file mode 100644
index 0000000..d4e7db4
--- /dev/null
+++ b/ex03/ft_atoi.c
@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atoi.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/03/27 19:51:48 by tischmid          #+#    #+#             */
+/*   Updated: 2023/03/28 03:26:16 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isspace(char c)
+{
+	return (c == ' '
+		|| c == '\t'
+		|| c == '\n'
+		|| c == '\r'
+		|| c == '\f'
+		|| c == '\v');
+}
+
+int	ft_atoi(char *str)
+{
+	while (ft_isspace(*str))
+		++str;
+	return (0);
+}
+
+/* ////
+#include <stdio.h>
+
+int	main(void)
+{
+	printf(": %d\n", ft_atoi(""));
+	printf("0: %d\n", ft_atoi("0"));
+	printf("1: %d\n", ft_atoi("1"));
+	printf("14: %d\n", ft_atoi("14"));
+	printf("120: %d\n", ft_atoi("120"));
+	printf("-0: %d\n", ft_atoi("-0"));
+	printf("-1: %d\n", ft_atoi("-1"));
+	printf("-14: %d\n", ft_atoi("-14"));
+	printf("-120: %d\n", ft_atoi("-120"));
+	printf("2147483647: %d\n", ft_atoi("2147483647"));
+	printf("-2147483648: %d\n", ft_atoi("-2147483648"));
+}
+*/ ////