1 files changed, 60 insertions, 0 deletions
diff --git a/exam00/rendu/ft_atoi/ft_atoi.c b/exam00/rendu/ft_atoi/ft_atoi.c
new file mode 100755
index 0000000..81f0706
--- /dev/null
+++ b/exam00/rendu/ft_atoi/ft_atoi.c
@@ -0,0 +1,60 @@
+char	ctoi(char c)
+{
+	return (c - '0');
+}
+
+int		ft_strlen(const char *str)
+{
+	int	counter;
+
+	counter = 0;
+	while (*str >= '0' && *str <= '9')
+	{
+		counter++;
+		str++;
+	}
+	return (counter);
+}
+
+int		pow10(int exponent)
+{
+	int	accumulator;
+
+	accumulator = 1;
+	while (exponent > 0)
+	{
+		accumulator *= 10;
+		exponent--;
+	}
+	return (accumulator);
+}
+
+int		ft_atoi(const char *str)
+{
+	int	nb;
+	int	i;
+	int	is_negative;
+
+	while (*str == ' ' || *str == '\t'|| *str == '\n'
+		   || *str == '\v'|| *str == '\f'|| *str == '\r')
+		str++;
+	if (*str == '-')
+		is_negative = 1;
+	else
+		is_negative = 0;
+	if (*str == '-' || *str == '+')
+	{
+		str++;
+	}
+	nb = 0;
+	i = ft_strlen(str) - 1;
+	while (*str >= '0' && *str <= '9')
+	{
+		nb += pow10(i) * ctoi(*str);
+		i--;
+		str++;
+	}
+	if (is_negative)
+		nb = -nb;
+	return (nb);
+}