SoftWriters Cash Register by Stephen Bierly

.gitignore

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+################################################################################
+# This .gitignore file was automatically created by Microsoft(R) Visual Studio.
+################################################################################
+
+/.vs/CashRegister/v16/Server/sqlite3
+/SWCashRegisterSB/.vs/SWCashRegisterSB/v16
+/SWCashRegisterSB/bin/Debug
+/SWCashRegisterSB/obj/Debug
+/.vs/slnx.sqlite

.vs/VSWorkspaceState.json

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+{
+  "ExpandedNodes": [
+    ""
+  ],
+  "PreviewInSolutionExplorer": false
+}

SWCashRegisterSB/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

SWCashRegisterSB/Calculators/ChangeCalculator.cs

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+using SWCashRegisterSB.Calculators.Interfaces;
+using SWCashRegisterSB.Models;
+using SWCashRegisterSB.Models.Interfaces;
+using SWCashRegisterSB.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Calculators
+{
+    public class ChangeCalculator : IChangeCalculator
+    {
+        public List<IChangeResult> CalculateChange(decimal changeAmount)
+        {
+            var result = new List<IChangeResult>();
+
+            while (changeAmount > 0)
+            {
+                var denomination = DenominationUtils.OrderedDenominations.First(x => x.Value <= changeAmount);
+                var count = decimal.ToInt32(changeAmount / denomination.Value);
+
+                result.Add(new ChangeResult(denomination, count));
+                changeAmount -= denomination.Value * count;
+            }
+
+            return result;
+        }
+    }
+}

SWCashRegisterSB/Calculators/Interfaces/IChangeCalculator.cs

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+using SWCashRegisterSB.Models.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Calculators.Interfaces
+{
+    public interface IChangeCalculator
+    {
+        List<IChangeResult> CalculateChange(decimal changeAmount);
+    }
+}

SWCashRegisterSB/Calculators/RandomChangeCalculator.cs

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+using SWCashRegisterSB.Calculators.Interfaces;
+using SWCashRegisterSB.Models;
+using SWCashRegisterSB.Models.Interfaces;
+using SWCashRegisterSB.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Calculators
+{
+    public class RandomChangeCalculator : IChangeCalculator
+    {
+
+        public List<IChangeResult> CalculateChange(decimal changeAmount)
+        {
+            var result = new Dictionary<string,IChangeResult>();
+            var random = new Random();
+
+            while(changeAmount > 0)
+            {
+                var denominations = DenominationUtils.OrderedDenominations.Where(x => x.Value <= changeAmount).ToList();
+                var index = random.Next(0, denominations.Count());
+                var denomination = denominations[index];
+                var count = random.Next(1, decimal.ToInt32(changeAmount / denomination.Value));
+
+                if (result.ContainsKey(denomination.Name))
+                    result[denomination.Name].Quantity += count;
+                else
+                    result.Add(denomination.Name, new ChangeResult(denomination, count));
+
+                changeAmount -= denomination.Value * count;
+
+            }
+
+            return result.Values.ToList();
+        }
+    }
+}

SWCashRegisterSB/Models/ChangeDenomination.cs

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+using SWCashRegisterSB.Models.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Models
+{
+    public class ChangeDenomination : IDenomination
+    {
+        public string Name { get; set; }
+        public string PluralName { get; set; }
+        public decimal Value { get; set; }
+    }
+}

SWCashRegisterSB/Models/ChangeResult.cs

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+using SWCashRegisterSB.Models.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Models
+{
+    public class ChangeResult : IChangeResult
+    {
+        public ChangeResult(IDenomination denomination, int quantity)
+        {
+            Denomination = denomination;
+            Quantity = quantity;
+        }
+        public IDenomination Denomination { get; set; }
+        public int Quantity { get; set; }
+    }
+}

SWCashRegisterSB/Models/Interfaces/IChangeResult.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Models.Interfaces
+{
+    public interface IChangeResult
+    {
+        IDenomination Denomination { get; set; }
+        int Quantity { get; set; }
+    }
+}

SWCashRegisterSB/Models/Interfaces/IDenomination.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB.Models.Interfaces
+{
+    public interface IDenomination
+    {
+        string Name { get; set; }
+        string PluralName { get; set; }
+        decimal Value { get; set; }
+    }
+}

SWCashRegisterSB/Program.cs

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+using SWCashRegisterSB.Utils;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegisterSB
+{
+    /// <summary>
+    /// Softwriters Cash Register by Stephen Bierly
+    /// Input file location is: "{RepoPath}\\SWCashRegisterSB\\input.txt"
+    /// Output file location is: "{RepoPath}\\SWCashRegisterSB\\output.txt"
+    /// </summary>
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var basePath = Path.GetFullPath(@"..\..\");
+            var inputPath = basePath + "input.txt";
+            var outputPath = basePath + "output.txt";
+
+
+            if (!File.Exists(inputPath))
+            {
+                Console.WriteLine($"Could not find input file. Expected to be '{inputPath}'");
+                Console.WriteLine("Press any key to exit...");
+                Console.ReadKey();
+                return;
+            }
+
+            try
+            {            
+                using (StreamWriter outWriter = new StreamWriter(outputPath, false))
+                {
+                    var currentLineNum = 1;
+                    foreach (var line in File.ReadLines(inputPath))
+                    {
+                        var parts = line.Split(',');
+                        decimal amountDue;
+                        decimal amountPaid;
+                        if(parts.Length != 2 || !decimal.TryParse(parts[0], out amountDue) || !decimal.TryParse(parts[1], out amountPaid))
+                        {
+                            Console.WriteLine($"Improperly formated line '{line}' on line '{currentLineNum}");
+                            currentLineNum++;
+                            continue;
+                        }
+
+                        //Excluding the possibility of refunds currently
+                        if(amountDue < 0 || amountPaid < 0)
+                        {
+                            Console.WriteLine($"Amount Paid ('{amountPaid}') and Amount Due ('{amountDue}') must be positive.");
+                            continue;
+                        }
+
+                        var changeDue = amountPaid - amountDue;
+
+                        if(changeDue < 0)
+                        {
+                            Console.WriteLine($"Insufficient payment on line '{currentLineNum}', payment is '{Math.Abs(changeDue)}' less than required.");
+                            currentLineNum++;
+                            continue;
+                        }
+
+                        if (changeDue == 0)
+                        {
+                            Console.WriteLine($"No change due on line {currentLineNum}");
+                            currentLineNum++;
+                            continue;
+                        }
+
+                        var calculator = DenominationUtils.GetChangeCalculator(amountDue);
+
+                        var change = calculator.CalculateChange(changeDue);
+
+                        var changeOutputLine = DenominationUtils.GetChangeOutput(change);
+
+                        outWriter.WriteLine(changeOutputLine);
+                        currentLineNum++;
+                    }
+
+                }
+            }
+            catch(Exception e)
+            {
+                Console.WriteLine($"Unexpected Error : '{e.Message}'");
+            }
+
+            Console.WriteLine("Press any key to exit...");
+            Console.ReadKey();
+        }
+    }
+}

SWCashRegisterSB/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SWCashRegisterSB")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SWCashRegisterSB")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("5cf33ad0-25e5-4d11-954f-ad914ae820ac")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

SWCashRegisterSB/SWCashRegisterSB.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{5CF33AD0-25E5-4D11-954F-AD914AE820AC}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>SWCashRegisterSB</RootNamespace>
+    <AssemblyName>SWCashRegisterSB</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Calculators\ChangeCalculator.cs" />
+    <Compile Include="Calculators\Interfaces\IChangeCalculator.cs" />
+    <Compile Include="Calculators\RandomChangeCalculator.cs" />
+    <Compile Include="Models\ChangeDenomination.cs" />
+    <Compile Include="Models\ChangeResult.cs" />
+    <Compile Include="Models\Interfaces\IChangeResult.cs" />
+    <Compile Include="Models\Interfaces\IDenomination.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Utils\DenominationUtils.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>