Day-9 of internship at Aartronix

Kernel module

What: It is a piece of compiled code (like a.ko file) that acts as a plugin.
Why: To keep the system efficient and flexible, loading code only when hardware is present, or it would be stored in storage.
How: The kernel reads the file, uses the Vendor/Product IDs to match the driver, and performs Dynamic Linking to connect the function calls.
When: It happens on demand (e.g., hot-plugging a USB).
Where: It runs in Kernel Space, sharing the highest privileges (and risks) with the OS core.
Revise C and Embedded C to use for kernel module.
1) check for armstrong numbers.
#include <stdio.h>
int length(int n)
{
int len = 0;
while (n != 0)
{
n = (int)(n / 10);
len++;
}
return len;
}
int number_separator(int n, int *arr)
{
int a = n;
int len = length(n);
for (int i = len - 1; i >= 0; i--)
{
arr[i] = (a % 10);
a = a / 10;
}
}
void main()
{
int n;
scanf("enter a number : %d", &n);
int arr[length(n)];
number_separator(n, arr);
int sum = 0;
for (int i = 0; i < length(n); i++)
{
int a = n;
sum += arr[i] * arr[i] * arr[i];
}
if (sum == n)
{
printf("The number %d is a armstrong number.\n", n);
}
else
{
printf("The number %d is not a armstrong number.\n", n);
}
}

Nishit