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ft_atoi.c
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ft_atoi.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: susajid <susajid@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/02 10:52:15 by susajid #+# #+# */
/* Updated: 2023/11/10 16:49:29 by susajid ### ########.fr */
/* */
/* ************************************************************************** */
// #include <stdlib.h>
// #include <stdio.h>
// whitespace ('\t', '\n', '\v', '\f', '\r', ' ')
int ft_atoi(const char *str)
{
long long result;
int sign;
while ((*str >= '\t' && *str <= '\r') || *str == ' ')
str++;
sign = 1;
if (*str == '-' || *str == '+')
{
if (*str == '-')
sign = -sign;
str++;
}
result = 0;
while (*str >= '0' && *str <= '9')
{
result *= 10;
result += (int)((*str - 48) * sign);
str++;
}
if (sign == -1 && result > 0)
return (0);
else if (sign == 1 && result < 0)
return (-1);
return ((int)result);
}
// int main(void)
// {
// char *string = "922337203685477111111111";
// printf("%d\n%d\n", ft_atoi(string), atoi(string));
// return (0);
// }