C language problem easy for C language experts

you will find a screenshot with instructions.

I need the codes in a simple way with comments that describe each line at least or the lines that matters most.

use Xcode editor or any other easy editors.

Example output:
Enter an integer: 5463
3
6
4
5
5463 is divisible by 9
An integer is divisible by 9 if the sum of its digits is divisible
by 9. Develop a program which will call UDF:
int get_input();
to prompt the user for an integer and return this user input
to main().
Call UDF:
void display(int val);
to display each digit of the integer starting with the
rightmost digit.
Your program should also determine whether or not the
(user-entered) integer is divisible by 9. Testing should
include using the following numbers.
n = 154368
n = 621594
123456
Enter an integer: 154367
7
6
3
4
5
n =
1
154367 is not divisible by 9
Hint: Use the modulus (%) operator to get each digit; then use / to remove the digit.
So 154368 % 10 gives 8 and 154368/10 gives 15436. The next digit extracted should be 6,
then 3 and son on.