please help with palindrome

I am in the beginning stages of C programming and in need of help.
I can't understand. please can someone explain me?

Why we assign reverse to 0 at first and what does the statements mean in the while statement? I also don't understand why temp=n...

Code:

---

#include <stdio.h>
 
main()
{
  int n, reverse = 0, temp;
 
  printf("Enter a number to check if it is a palindrome or not\n");
  scanf("%d",&n);
 
  temp = n;
 
  while (temp != 0)
  {
      reverse = reverse * 10;
      reverse = reverse + temp%10;
      temp    = temp/10;
  }
 
  if (n == reverse)
      printf("%d is a palindrome number.\n", n);
  else
      printf("%d is not a palindrome number.\n", n);
 
  return 0;
}

---

Hey,

Tried to comment lines. Hope it'll be helpfull.

Code:

---

#include <stdio.h>
 
main()
{
  int n, reverse = 0, temp; // Initialize reverse at zero (if not so it has a garbage value) because we use it to calculate new value. We don't want to use any valued variable.
 
  printf("Enter a number to check if it is a palindrome or not\n");
  scanf("%d",&n);
 
  temp = n; // Hold taken number to process it. We don't want to lose real value because we need to use it to check if it is palindrome.
 
  while (temp != 0) // Loop for calculation. 'temp' will be parsed/reversed.
  {
      reverse = reverse * 10; // Shift left by one
      reverse = reverse + temp%10; // Take the most value of temp and add it to reverse's least.
      temp    = temp/10; // Shift right the temp by one.
  }
 
  if (n == reverse) // Checking :)
      printf("%d is a palindrome number.\n", n);
  else
      printf("%d is not a palindrome number.\n", n);
 
  return 0;
}

---

You can do away with the temp variable if you simply write a function called (for example) unsigned reverse_digits(unsigned n);

Also, please declare main as int main(void) (i.e. be explicit)