using System;

public class Program

{

    public static void Main()

    {

        // Descriptive variable names so I know what the variables contain at a glance

        // Aka, I don't want to have to look at the variable assignment/declaration to

        // know what its value is used for 

        int startingNumber;

        int subtractingNumber;

        string startingNumberInput;

        string subtractingNumberInput;

        // 1. Get User Inputs

        Console.WriteLine("Enter the number that will be subtracted from");

        startingNumberInput = Console.ReadLine();

        Console.WriteLine("Enter the number that will be subtracted repeatedly from the first number");

        subtractingNumberInput = Console.ReadLine();

        // 2. Verify if inputs are numbers

        // Have a google of the documentation of int.TryParse and int.Parse to get a better understanding

        //

        // Summary: Parse will crash the program if the provided string is not a number; 

        //          TryParse will return TRUE if the provided string is a number, or return FALSE if the provided string is not a number

        if(int.TryParse(startingNumberInput, out startingNumber) && int.TryParse(subtractingNumberInput, out subtractingNumber))

        {

            // 3.1 Both inputs were numbers, Parsing was successful

            // startingNumber and subtractingNumber were assigned by the out of their respective TryParse methods

            int stepsToZero = (int)(startingNumber / subtractingNumber);

            int currentNumber = startingNumber;

            // For loops are the most efficient form of loop

            for(int i = stepsToZero; i > 0; i--)

            {

                int answer = currentNumber - subtractingNumber;

                // This is how I would have done it with String Interpolation? Fiddle wouldn't let me use it : (

                // Console.WriteLine($"{currentNumber} - {subtractingNumber} = {answer}");

                string output = currentNumber + " - " + subtractingNumber + " = " + answer;

                Console.WriteLine(output);

                currentNumber = answer;

            }

        }

        else

        {

            // 3.2 One or both inputs were not numbers, parsing was not successful

            Console.WriteLine("One of the provided numbers was not a number. Please rerun the program and try again.");

        }

​

        // 4. FIN

        Console.ReadLine();

    }

}