1 files changed, 113 insertions, 0 deletions
diff --git a/ft_itoa.c b/ft_itoa.c
new file mode 100644
index 0000000..f892fb1
--- /dev/null
+++ b/ft_itoa.c
@@ -0,0 +1,113 @@
+/*
+Libft Copyright (C) 2026 yctct
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "libft.h"
+
+static long int	ft_nbrlen(long int n)
+{
+	int	len;
+
+	len = 0;
+	if (n < 0)
+	{
+		n = -n;
+		len += 1;
+	}
+	while (n)
+	{
+		n /= 10;
+		len++;
+	}
+	return (len);
+}
+
+char	*ft_itoa(int nb)
+{
+	char	*c;
+	int		len;
+	long	n;
+
+	n = nb;
+	if (n == 0)
+		return (ft_strdup("0"));
+	len = ft_nbrlen(n);
+	c = malloc(sizeof(char) * (len + 1));
+	if (!c)
+		return (NULL);
+	if (n < 0)
+	{
+		n = -n;
+		c[0] = '-';
+	}
+	c[len] = '\0';
+	while (n)
+	{
+		c[--len] = (n % 10) + '0';
+		n /= 10;
+	}
+	return (c);
+}
+/*
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	int		n1;
+	int		n2;
+	int		n3;
+	int		n4;
+	int		n5;
+	char	*ptr;
+	char	*ptr2;
+	char	*ptr3;
+	char	*ptr4;
+	char	*ptr5;
+	char	*ptr6;
+	char	c;
+
+	c = 'a';
+	n1 = 42;
+	n2 = 0;
+	n3 = -42;
+	n4 = 2147483647;
+	n5 = -2147483648;
+	ptr = ft_itoa(n1);
+	printf("      42: %s\n", ptr);
+	free(ptr);
+	printf("----------------\n");
+	ptr2 = ft_itoa(n2);
+	printf("       0: %s\n", ptr2);
+	free(ptr2);
+	printf("----------------\n");
+	ptr3 = ft_itoa(n3);
+	printf("     -42: %s\n", ptr3);
+	free(ptr3);
+	printf("----------------\n");
+	ptr4 = ft_itoa(n4);
+	printf(" INT_MAX: %s\n", ptr4);
+	free(ptr4);
+	printf("----------------\n");
+	ptr5 = ft_itoa(n5);
+	printf(" INT_MIN: %s\n", ptr5);
+	free(ptr5);
+	printf("----------------\n");
+	ptr6 = ft_itoa(c);
+	printf("char 'a': %s\n", ptr6);
+	free(ptr6);
+}
+*/