Program.cs

using System;
using FirstCmdLineApp.Maths;
using FirstCmdLineApp.MovingParts;

namespace FirstCmdLineApp
{
    public class Program
    {
        static void Main()
        {

        //obligatory greeting to world
        Console.WriteLine("Hello World!");
        Console.WriteLine("");

        Console.WriteLine("What's your name?");
        var systemUser = new Person();
        systemUser.Name = Console.ReadLine();
        systemUser.Introduce();

        var myName = new Person();
        myName.Name = "Margarida";
        myName.Present();

        System.Threading.Thread.Sleep(1000);
        Console.Clear();

        #region OrderofOperations
        //region allows me to create collapsible areas of code that I don't need to look at, and don't expect anyone to need to use
        //or maintain.

        //declare some vars with default numbers
        var a = 15f;
        var b = 3f;

        Console.WriteLine("::::: Order of Operations :::::");
        Console.WriteLine("Let's start by getting some numbers to work with.");

        try
        {
            Console.Write("a = ");
            a = Convert.ToSingle(Console.ReadLine());
        }
        catch (FormatException ex)
        {
            Console.WriteLine("Input was not a number, a has been set to " + a);
            Console.WriteLine("Exception was of type: " + ex.GetType().Name + ", and the message was: " + ex.Message);
            }

        try
        {
            Console.Write("b = ");
            b = Convert.ToSingle(Console.ReadLine());
        }
        catch (Exception ex)
        {
            Console.WriteLine("Input was not a number, b has been set to " + b);
            Console.WriteLine("Exception was of type: " + ex.GetType().Name + ", and the message was: " + ex.Message);
            }

        var calculator = new Calculator();
        var result = calculator.Parse(a, b);
        
        Console.WriteLine("");
        Console.WriteLine("a = " + a);
        Console.WriteLine("b = " + b);
        Console.WriteLine("");
        Console.WriteLine("We are going to ask C# to return the following: " + a + " / " + b + " * " + b);
        Console.WriteLine("We will see whether C# prioritises multiplication over the division, and performs b*b first (" + (b*b) + ") or whether the division a/b is performed first (" + a/b + ").");
        System.Threading.Thread.Sleep(7000);
        
        Console.WriteLine("Solution: " + a + " / " + b + " * " + b + " = " + result);
        Console.Beep();
        Console.WriteLine("");

        if (result == calculator.ForceDivide(a, b))
        {
            Console.WriteLine("We can see that C# prioritises division, which is why 10 / 3 * 3 = " + calculator.ForceDivide(a, b) +
                                  ". Otherwise, the solution would be " + calculator.ForceMultiply(a, b) + ".");
            Console.WriteLine("");
            Console.WriteLine("C# has prioritised the operators in the order they were written in. This would not be true if instead of / we had asked for the solution to '10 - 3 * 3'; C# will prioritise multiplication and division over addition and subtraction, otherwise it will take the operators in order.");
            System.Threading.Thread.Sleep(5000);
            Console.WriteLine("Let's see that in action:");
            float g = a - b * b;
            Console.WriteLine("");
            Console.WriteLine("Solution: " + a + " - " + b + " * " + b + " = " + g);
            Console.Beep();
        }
        else
        {
            Console.WriteLine("We can see that without brackets, the multiplication will always be done first. Otherwise, the result would have been " + calculator.ForceDivide(a, b));
        }

        #endregion

        Console.WriteLine("");
        Console.WriteLine("mapgie ©2019");
        Console.WriteLine("");
        Console.WriteLine("Press any key to exit.");
        Console.ReadKey(true);
            
        }
    }
}