ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: adono-ma <adono-ma@student.42madrid>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/03/09 18:43:18 by adono-ma          #+#    #+#             */
/*   Updated: 2024/03/09 22:00:17 by adono-ma         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	i;
	int	sign;
	int	result;

	i = 0;
	sign = 1;
	result = 0;
	while (str[i] == ' ' || (str[i] >= 9 && str[i] <= 13))
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign *= -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		result *= 10;
		result += str[i] - '0';
		i++;
	}
	return (sign * result);
}

/*int main ()
{
    int i;
    char str[12];

    ft_strcpy(str, "0987654321");
    result = ft_atoi(str);
    printf("str value = %s, int result = %d\n", str, result);

    ft_strcpy(str, "thisisatrial");
    result = ft_atoi(str);
    printf("str value = %s, int result = %d\n", str, result);

    return(0);
}
*/