Libft/ft_atoi.c at main · Sumeyyye3/Libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sumdogan <sumdogan@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/21 10:49:29 by sumdogan          #+#    #+#             */
/*   Updated: 2026/01/28 20:04:17 by sumdogan         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int	ft_atoi(const char *nptr)
{
	int	i;
	int	main_number;
	int	flag;

	i = 0;
	main_number = 0;
	flag = 1;
	while ((nptr[i] == ' ') || (nptr[i] <= 13 && nptr[i] >= 9))
		i++;
	if ((nptr[i] == 43) || (nptr[i] == 45))
	{
		if (nptr[i] == 45)
			flag *= -1;
		i++;
	}
	while (nptr[i] <= 57 && nptr[i] >= 48)
	{
		main_number = main_number * 10 + nptr[i] - '0';
		i++;
	}
	return (main_number * flag);
}