Change Calculator for Creative Cash Draw Solutions

CashRegister.Test/CashRegister.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="nunit" Version="3.12.0" />
+        <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\CashRegister\CashRegister.csproj" />
+    </ItemGroup>
+
+</Project>

CashRegister.Test/CashRegister.cs

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+using NUnit.Framework;
+using static CashRegister.Main;
+
+namespace CashRegister.Test
+{
+    public class CashRegisterTest
+    {
+
+        [Test]
+        [TestCase(1.97, 2.00, "3 pennies")]
+        [TestCase(3.34, 5.00, "1 dollar, 2 quarters, 1 dime, 1 nickel, 1 penny")]
+        [TestCase(6.49, 7.00, "2 quarters, 1 penny")]
+        [TestCase(1.97, 4.00, "2 dollars, 3 pennies")]
+        [TestCase(9.97, 10.00, "3 pennies")]
+        [TestCase(1234.57, 2000.00, "7 hundreds, 1 fifty, 1 ten, 1 five, 1 quarter, 1 dime, 1 nickel, 3 pennies")]
+        public void GetChangeTest(decimal cost, decimal given, string expected)
+        {
+            var output = GetChange(cost, given);
+            Assert.AreEqual(output, expected);
+        }
+
+        [Test]
+        [TestCase(3.00, 4.00)]
+        public void GetRandomChangeTest(decimal cost, decimal given)
+        {
+            var randomOutput = GetChange(cost, given);
+            var otherRandomOutput = GetChange(cost, given);
+            Assert.AreNotEqual(randomOutput, otherRandomOutput);
+        }
+    }
+}

CashRegister/.gitignore

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+bin
+obj

CashRegister/CashRegister.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+    </PropertyGroup>
+
+    <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+      <DebugType>full</DebugType>
+    </PropertyGroup>
+
+</Project>

CashRegister/Main.cs

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+using System;
+using System.Collections.Generic;
+
+namespace CashRegister
+{
+    public class Denominator
+    {
+        public string Name;
+        public string Plural;
+        public decimal Nominal;
+    }
+
+    public static class Main
+    {
+
+        private static List<Denominator> _coins =
+            new List<Denominator>()
+            {
+                new Denominator {Name = "hundred", Plural = "hundreds", Nominal = 100m},
+                new Denominator {Name = "fifty", Plural = "fifties", Nominal = 50m},
+                new Denominator {Name = "twenty", Plural = "twenties", Nominal = 20m},
+                new Denominator {Name = "ten", Plural = "tens", Nominal = 10m},
+                new Denominator {Name = "five", Plural = "fives", Nominal = 5m},
+                new Denominator {Name = "dollar", Plural = "dollars", Nominal = 1m},
+                new Denominator {Name = "quarter", Plural = "quarters", Nominal = 0.25m},
+                new Denominator {Name = "dime", Plural = "dimes", Nominal = 0.10m},
+                new Denominator {Name = "nickel", Plural = "nickels", Nominal = 0.05m},
+                new Denominator {Name = "penny", Plural = "pennies", Nominal = 0.01m}
+            };
+
+        public static string GetChange(decimal cost, decimal given)
+        {
+            var change = given - cost;
+
+            if (cost * 100 % 3 == 0)
+                return _getRandomChange(change);
+
+            var changeDescriptor = new List<string>();
+
+            foreach (var coin in _coins)
+            {
+                var count = (int) (change / coin.Nominal);
+                change -= count * coin.Nominal;
+
+                var coinName = $"{(count > 1 ? coin.Plural : coin.Name )}";
+
+                if(count != 0)
+                    changeDescriptor.Add($"{count} {coinName}");
+            }
+
+            return string.Join(", ", changeDescriptor);
+        }
+
+        private static string _getRandomChange(decimal change)
+        {
+            var changeDescriptor = new List<string>();
+
+            foreach (var coin in _coins)
+            {
+                var count = (int) (change / coin.Nominal);
+                decimal randomCount = coin.Name == "penny" ? count : new Random().Next(0, count);
+
+                change -= randomCount * coin.Nominal;
+
+                var coinName = $"{(count > 1 ? coin.Plural : coin.Name )}";
+
+                if(randomCount != 0)
+                    changeDescriptor.Add($"{randomCount} {coinName}");
+            }
+
+            return string.Join(", ", changeDescriptor);
+        }
+    }
+}

CreativeCashDrawSolutions.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Desktop", "Desktop\Desktop.csproj", "{E622993A-01AA-4419-8863-732AB8175AA8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CashRegister", "CashRegister\CashRegister.csproj", "{5E7ECCC7-8C6D-4CDC-AE65-8B63ECF190AA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CashRegister.Test", "CashRegister.Test\CashRegister.Test.csproj", "{BEB7BFB2-AB84-49AA-A0B9-A27E643D9A61}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E622993A-01AA-4419-8863-732AB8175AA8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E622993A-01AA-4419-8863-732AB8175AA8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E622993A-01AA-4419-8863-732AB8175AA8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E622993A-01AA-4419-8863-732AB8175AA8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5E7ECCC7-8C6D-4CDC-AE65-8B63ECF190AA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5E7ECCC7-8C6D-4CDC-AE65-8B63ECF190AA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5E7ECCC7-8C6D-4CDC-AE65-8B63ECF190AA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5E7ECCC7-8C6D-4CDC-AE65-8B63ECF190AA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BEB7BFB2-AB84-49AA-A0B9-A27E643D9A61}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BEB7BFB2-AB84-49AA-A0B9-A27E643D9A61}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BEB7BFB2-AB84-49AA-A0B9-A27E643D9A61}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BEB7BFB2-AB84-49AA-A0B9-A27E643D9A61}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Desktop/App.xaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Desktop.App">
+    <Application.Styles>
+        <StyleInclude Source="avares://Avalonia.Themes.Default/DefaultTheme.xaml"/>
+        <StyleInclude Source="avares://Avalonia.Themes.Default/Accents/BaseLight.xaml"/>
+    </Application.Styles>
+</Application>

Desktop/App.xaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace Desktop
+{
+    public class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                desktop.MainWindow = new MainWindow();
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+   }
+}

Desktop/Desktop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Update="**\*.xaml.cs">
+      <DependentUpon>%(Filename)</DependentUpon>
+    </Compile>
+    <AvaloniaResource Include="**\*.xaml">
+      <SubType>Designer</SubType>
+    </AvaloniaResource>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="0.9.0" />
+    <PackageReference Include="Avalonia.Desktop" Version="0.9.0" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="0.9.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\CashRegister\CashRegister.csproj" />
+  </ItemGroup>
+</Project>

Desktop/MainWindow.xaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:Desktop.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Desktop.MainWindow"
+        Title="Cash Register">
+    <StackPanel Orientation="Vertical" Spacing="4" Margin="25">
+        <Button FontSize="20" Name="OpenFile">OPEN FILE</Button>
+        <TextBlock Text="{Binding Path=Input}"/>
+        <TextBlock Text="{Binding Path=Output}"/>
+    </StackPanel>
+</Window>

Desktop/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Desktop.ViewModels;
+using static CashRegister.Main;
+
+namespace Desktop
+{
+    public class MainWindow : Window
+    {
+        CashRegisterViewModel ViewModel = new CashRegisterViewModel();
+        public MainWindow()
+        {
+            InitializeComponent();
+            DataContext = ViewModel;
+        }
+
+        private void InitializeComponent()
+        {
+            AvaloniaXamlLoader.Load(this);
+            this.FindControl<Button>("OpenFile").Click += async delegate
+            {
+                OpenFileDialog dialog = new OpenFileDialog();
+
+                string[] result = await dialog.ShowAsync(this);
+                string fileContents = File.ReadAllText(result.First());
+                string[] items = fileContents.Split("\n");
+
+                List<string> changeOutput = items.Select(item =>
+                {
+                    string[] input = item.Split(",");
+                    decimal cost = decimal.Parse(input[0]);
+                    decimal given = decimal.Parse(input[1]);
+
+                    return GetChange(cost, given);
+                }).ToList();
+
+                ViewModel.Input = string.Join("\n", items);;
+                ViewModel.Output = string.Join("\n", changeOutput);
+
+            };
+        }
+    }
+}

Desktop/Program.cs

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+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Logging.Serilog;
+
+namespace Desktop
+{
+    class Program
+    {
+        // Initialization code. Don't use any Avalonia, third-party APIs or any
+        // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+        // yet and stuff might break.
+        public static void Main(string[] args) => BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+
+        // Avalonia configuration, don't remove; also used by visual designer.
+        public static AppBuilder BuildAvaloniaApp()
+            => AppBuilder.Configure<App>()
+                .UsePlatformDetect()
+                .LogToDebug();
+    }
+}

Desktop/ViewModels/CashRegisterViewModel.cs

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+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reactive;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using System.Threading;
+using ReactiveUI;
+
+namespace Desktop.ViewModels
+{
+    public class CashRegisterViewModel : ReactiveObject
+    {
+        private string _input = "";
+        private string _output = "";
+
+        public string Input
+        {
+            get { return _input; }
+            set { this.RaiseAndSetIfChanged(ref this._input, value); }
+        }
+
+        public string Output
+        {
+            get { return _output; }
+            set { this.RaiseAndSetIfChanged(ref this._output, value); }
+        }
+    }
+}

Desktop/nuget.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="AvaloniaCI" value="https://www.myget.org/F/avalonia-ci/api/v2" />
+  </packageSources>
+</configuration>