Ex01Q05 fixed

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace A15_Ex01_5
{

    class Program
    {

        static void Main()
        {
            int usersNumber;
            int firstDigit;
            int numberOfBiggerDigits, numberOfSmallerDigits;
            int smallestDigit, biggestDigit;
            askForInput();
            usersNumber = int.Parse(System.Console.ReadLine());
            while (!isEightDigited(usersNumber))
            {
                askForInput();
                usersNumber = int.Parse(System.Console.ReadLine());
            }
            firstDigit = getFirstDigit(usersNumber);
            numberOfBiggerDigits = howManyBiggerThanFirstDigit(usersNumber, firstDigit);
            numberOfSmallerDigits = howManySmallerThanFirstDigit(usersNumber, firstDigit);
            smallestDigit = findSmallestDigit(usersNumber);
            biggestDigit = findBiggestDigit(usersNumber);
            System.Console.WriteLine("There are " +numberOfBiggerDigits+ " digits that are bigger than the first digit.");
            System.Console.WriteLine("There are " + numberOfSmallerDigits + " digits that are smaller than the first digit.");
            System.Console.WriteLine("The biggest digit is: " +biggestDigit);
            System.Console.WriteLine("The smallest digit is: " + smallestDigit);
            System.Console.ReadLine();
        }
        static int howManyBiggerThanFirstDigit(int i_number, int i_firstDigit)
        {
            int o_counter = 0;
            while (i_number != 0)
            {
                if (getLastDigit(i_number) > i_firstDigit)
                {
                    o_counter++;
                }
                i_number = cutLastDigit(i_number);
            }
            return o_counter;
        }
        static int howManySmallerThanFirstDigit(int i_number, int i_firstDigit)
        {
            int o_counter = 0;
            while (i_number != 0)
            {
                if (getLastDigit(i_number) < i_firstDigit)
                {
                    o_counter++;
                }
                i_number = cutLastDigit(i_number);
            }
            return o_counter;
        }
        static int getFirstDigit(int i_number)
        {
            return (int)i_number/10000000;
        }
        static int findBiggestDigit(int i_number)
        {
            int o_currentBiggest = 0;
            while (i_number != 0)
            {
                if (getLastDigit(i_number) > o_currentBiggest)
                {
                    o_currentBiggest = i_number % 10;
                }
                i_number = cutLastDigit(i_number);
            }
            return o_currentBiggest;
        }
        static int findSmallestDigit(int i_number)
        {
            int o_currentSmallest = getLastDigit(i_number);
            while (i_number != 0)
            {
                if (getLastDigit(i_number) < o_currentSmallest)
                {
                    o_currentSmallest = i_number % 10;
                }
                i_number = cutLastDigit(i_number);
            }
            return o_currentSmallest;
        }
        static int getLastDigit(int i_number)
        {
            return i_number % 10;
        }
        static int cutLastDigit(int i_number)
        {
            return i_number /= 10;
        }
        static bool isEightDigited(int i_number){
            int digitCounter = 0;
            while (i_number != 0){
                digitCounter++;
                i_number = cutLastDigit(i_number);
            }
            return (digitCounter == 8);
        }
        static void askForInput()
        {
            System.Console.WriteLine("Please enter 8-digit number: ");
        }
    }
}