ft_atoi.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rmikhayl <rmikhayl@student.42london.c      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/12/17 17:25:27 by rmikhayl          #+#    #+#             */
/*   Updated: 2023/12/17 17:25:27 by rmikhayl         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
/* *************************** ft_atoi ************************************** */
/*   Converts the string 'str' to an integer, taking into account the sign.   */
/*                                                                            */
/*   In layman's terms: It's like translating a number written in text into a */
/*   numerical value.                                                         */
/* ************************************************************************** */
 
int ft_atoi(char *str)
{
    int sign;
    int num;
    int i;
 
    sign = 1;
    num = 0;
    i = 0;
    while (str[i] == ' ' || (str[i] >= '\t' && str[i] <= '\r'))
        i++;
    if (str[i] == '-' || str[i] == '+')
    {
        if (str[i] == '-')
        {
            sign = -1;
        }
        i++;
    }
    while (str[i] >= '0' && str[i] <= '9')
    {
        num = num * 10 + (str[i] - '0');
        i++;
    }
    return (sign * num);
}