exam02

1 files changed, 59 insertions, 0 deletions

diff --git a/exam02/rendu/ft_atoi/ft_atoi.c b/exam02/rendu/ft_atoi/ft_atoi.c
new file mode 100755
index 0000000..eda0f8d
--- /dev/null
+++ b/exam02/rendu/ft_atoi/ft_atoi.c
@@ -0,0 +1,59 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atoi.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: exam <marvin@42.fr>                        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/07/19 17:46:19 by exam              #+#    #+#             */
+/*   Updated: 2019/07/19 18:03:23 by exam             ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	pow10(int exponent)
+{
+	int	acc;
+
+	acc = 1;
+	while (exponent > 0)
+	{
+		acc *= 10;
+		exponent--;
+	}
+	return (acc);
+}
+
+
+int	ft_atoi(const char *str)
+{
+	int	nb;
+	int i;
+	int j;
+	int	is_negative;
+
+	nb = 0;
+	while (*str == ' ' | *str == '\t' || *str == '\n' || *str == '\v'
+			|| *str == '\f' || *str == '\r')
+		str++;
+	is_negative = 0;
+	if (*str == '-' || *str == '+')
+	{
+		if (*str == '-')
+			is_negative = 1;
+		str++;
+	}
+	j = 0;
+	while (str[j] >= '0' && str[j] <= '9')
+		j++;
+	j--;
+	i = 0;
+	while (j >= 0)
+	{
+		nb += (str[j] - '0') * pow10(i);
+		i++;
+		j--;
+	}
+	if (is_negative)
+		nb = -nb;
+	return (nb);
+}