ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: akdemir <akdemir@student.42istanbul.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/07/09 20:41:15 by akdemir           #+#    #+#             */
/*   Updated: 2023/07/20 15:11:40 by akdemir          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	int	i;
	int	s;
	int	c;

	i = 0;
	s = 1;
	c = 0;
	while (str[i] == ' ' || (str[i] >= 9 && str[i] <= 13))
		i++;
	if (str[i] == '+' || str[i] == '-')
	{
		if (str[i] == '-')
			s *= -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		c = (10 * c) + (str[i] - '0');
		i++;
	}
	return (c * s);
}
int main()
{
	char *str="123";
	ft_atoi(str);
	printf("%s",str);
}