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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_atoi.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: exam <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/19 17:46:19 by exam #+# #+# */
/* Updated: 2019/07/19 18:03:23 by exam ### ########.fr */
/* */
/* ************************************************************************** */
int pow10(int exponent)
{
int acc;
acc = 1;
while (exponent > 0)
{
acc *= 10;
exponent--;
}
return (acc);
}
int ft_atoi(const char *str)
{
int nb;
int i;
int j;
int is_negative;
nb = 0;
while (*str == ' ' | *str == '\t' || *str == '\n' || *str == '\v'
|| *str == '\f' || *str == '\r')
str++;
is_negative = 0;
if (*str == '-' || *str == '+')
{
if (*str == '-')
is_negative = 1;
str++;
}
j = 0;
while (str[j] >= '0' && str[j] <= '9')
j++;
j--;
i = 0;
while (j >= 0)
{
nb += (str[j] - '0') * pow10(i);
i++;
j--;
}
if (is_negative)
nb = -nb;
return (nb);
}
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