Analytical Engine calculationsVer2.txt

## Analytical Engine calculationsVer2.txt
// Code for Ada's table: https://www.fourmilab.ch/babbage/figures/menat3_l.png
// Source: https://www.fourmilab.ch/babbage/sketch.html
// table with code references for no-developers: https://cdn-images-1.medium.com/max/2000/1*OMxBw7S_0c60qzx5pMs6Pw.png
// working program: https://cdn-images-1.medium.com/max/800/1*xomOzLz9HRJBiqRrK4MlEw.gif

using System;
using System.Threading;

namespace AnalyticalEngine
{
    public enum VariableChangeCard //just for reference
    {
        Zero = 0,
        Retain = 1
    }

    public enum OperationCard //just for reference
    {
        Add = 0,
        Subtract = 1,
        Multiply = 2,
        Divide = 3
    }

    class Engine
    {
        const int numberOfOperations = 11;
        const int numberOfVariables = 17;
        const int numberOfInputVariables = 6;

        int[] V = new int[numberOfVariables];

        int[] operationCards = new[] { 2, 2, 2, 2, 2, 2, 1, 1, 1, 3, 3 }; //see OperationCard enum for the numerical values meanings
        int[] firstVariableChangeCards = new[] { 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };  //see VariableChangeCard enum for the numerical values meanings
        int[] secondVariableChangeCards = new[] { 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0 }; //see VariableChangeCard enum for the numerical values meanings
        int[] firstVariableSupplyingCards = new[] { 0, 3, 2, 5, 0, 2, 6, 8, 10, 13, 14 }; //index of the first variable that will be used in operation
        int[] secondVariableSupplyingCards = new[] { 4, 1, 4, 1, 5, 3, 7, 9, 11, 12, 12 };//index of the second variable that will be used in operation
        int[] receivingVariableCards = new[] { 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };  //index of the variable that will store the operation result

        public void Run()
        {
            Console.WriteLine("Please enter the input variables");
            /*
            V[0] = m
            V[1] = n
            V[2] = d
            V[3] = m'
            V[4] = n'
            V[5] = d'
            */
            for (int i = 0; i < numberOfInputVariables; i++)
            {
                readInputVariable(i);
            }

            PrintVariables();
            Console.WriteLine();

            try
            {
                for (int i = 0; i < numberOfOperations; i++)
                {
                    var resultVariableIndex = receivingVariableCards[i];
                    var operation = operationCards[i];
                    var firstVariableIndex = firstVariableSupplyingCards[i];
                    var secondVariableIndex = secondVariableSupplyingCards[i];
                    var firstVariableValueChange = firstVariableChangeCards[i];
                    var secondVariableValueChange = secondVariableChangeCards[i];

                    V[resultVariableIndex] = CalculateOperation(operation, firstVariableIndex, secondVariableIndex);
                    V[firstVariableIndex] = ChangeVariable(firstVariableIndex, firstVariableValueChange);
                    V[secondVariableIndex] = ChangeVariable(secondVariableIndex, secondVariableValueChange);

                    PrintVariables();
                }
            }
            catch (Exception)
            {
                Console.WriteLine("Oops, something went wrong. Ringing the bell to notify the user");
                Console.Beep();
            }
            Console.WriteLine("Done");
        }

        private void readInputVariable(int i)
        {
            Console.Write("V[{0}] = ", i);
            var input = Console.ReadLine();
            var inputInt = 0;
            int.TryParse(input, out inputInt);
            V[i] = inputInt;
        }

        private void PrintVariables()
        {
            for (int i = 0; i < numberOfVariables; i++)
            {
                Console.Write("V{0}={1} ", i, V[i]);
            }
            Console.WriteLine();
        }

        private int CalculateOperation(int operation, int firstVariableIndex, int secondVariableIndex)
        {
            simulateMill();
            switch (operation)
            {
                case 0: // OperationCard.Add:
                    return V[firstVariableIndex] + V[secondVariableIndex];
                case 1: // OperationCard.Subtract:
                    return V[firstVariableIndex] - V[secondVariableIndex];
                case 2: // OperationCard.Multiply
                    return V[firstVariableIndex] * V[secondVariableIndex];
                case 3: // OperationCard.Divide:
                    return V[firstVariableIndex] / V[secondVariableIndex];
                default:
                    return 0;
            }
        }

        private int ChangeVariable(int variableIndex, int variableChangeCard)
        {
            switch (variableChangeCard)
            {
                case 0:
                    return 0;
                case 1:
                    return V[variableIndex];
                default:
                    return 0;
            }
        }

        private static void simulateMill()
        {
            Console.Write("Calculating");
            for (int i = 0; i < 10; i++)
            {
                Console.Write(".");
                Thread.Sleep(200);
            }
            Console.WriteLine();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var engine = new Engine();
            engine.Run();

            Console.ReadKey();
        }
    }
}