Task 101 of more malloc free

Author: paulina351

0x0C-more_malloc_free/101-mul

@@ -0,0 +1,94 @@
+#include "main.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+/**
+ * is_digit -  checks if a striing cintains a non digits char
+ * @s: string to be evaluated
+ * Return: 0 or 1
+ */
+int is_digit(char *s)
+{
+	int a = 0;
+
+	while (s[a])
+	{
+		if (s[a] < '0' || s[a] > '9')
+			return (0);
+		a++;
+	}
+	return (1);
+}
+
+/**
+ * _strlen - returns the length of a string
+ * @s: string to evaluate
+ * Return: the length of the string
+ */
+int _strlen(char *s)
+{
+	int a = 0;
+
+	while (s[a] != '\0')
+	{
+		a++;
+	}
+	return (a);
+}
+
+/**
+ * errors - handles error for main
+ */
+void errors(void)
+{
+	printf("Errors\n");
+	exit(98);
+}
+
+/**
+ * main - multiplies two positive numbers
+ * @argc: counts of args
+ * @argv: vector of args
+ * Return: 0
+ */
+int main(int argc, char *argv[])
+{
+	char *s1, *s2;
+	int len1, len2, len, a, carry, digit1, digit2, *result, b = 0;
+
+	s1 = argv[1], s2 = argv[2];
+	if (argc != 3 || !is_digit(s1) || !is_digit(s2))
+		errors();
+	len1 = _strlen(s1);
+	len2 = _strlen(s2);
+	len = len1 + len2 + 1;
+	result = malloc(sizeof(int) * len);
+	if (!result)
+		return (1);
+	for (a = 0; a <= len1 + len2; a++)
+		result[a] = 0;
+	for (len1 = len1 - 1; len1 >= 0; len1--)
+	{
+		digit1 = s1[len1] - '0';
+		carry = 0;
+		for (len2 = _strlen(s2) - 1; len2 >= 0; len2--)
+		{
+			digit2 = s2[len2] - '0';
+			carry += result[len1 + len2 + 1] + (digit1 * digit2);
+			result[len1 + len2 + 1] = carry % 10;
+			carry /= 10;
+		}
+		if (carry > 0)
+			result[len1 + len2 + 1] += carry;
+	}
+	for (a = 0; a < len - 1; a++)
+	{
+		if (result[a])
+			b = 1;
+		if (b)
+			_putchar('0');
+	}
+	_putchar('\n');
+	free(result);
+	return (0);
+}

0x0C-more_malloc_free/101-mul.c

@@ -0,0 +1,13 @@
+#include <unistd.h>
+
+/**
+ * _putchar - writes the character c to stdout
+ * @c: The character to print
+ *
+ * Return: On success 1.
+ * On error, -1 is returned, and errno is set appropriately.
+ */
+int _putchar(char c)
+{
+	return (write(1, &c, 1));
+}