SoftWriters Cash Register James Fowler

.gitignore

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+################################################################################
+# This .gitignore file was automatically created by Microsoft(R) Visual Studio.
+################################################################################
+
+/obj/Debug
+/bin/Debug
+/.vs

App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.1"/>
+    </startup>
+</configuration>

ChangeCalculatorFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegister
+{
+    public static class ChangeCalculatorFactory
+    {
+        private static RandomChangeCalculator randomChangeCalculator = new RandomChangeCalculator();
+        private static MinimumChangeCalculator minimumChangeCalculator = new MinimumChangeCalculator();
+
+        public static IChangeCalculator GetChangeCalculator(int changeAmount)
+        {
+            if (changeAmount % 3 == 0)
+            {
+                return randomChangeCalculator;
+            }
+            else
+            {
+                return minimumChangeCalculator;
+            }
+        }
+    }
+}

Currency.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegister
+{
+    public class Currency
+    {
+        public static Currency Hundred { get; } = new Currency("hundred", "hundreds", 10000);
+        public static Currency Fifty { get; } = new Currency("fifty", "fifties", 5000);
+        public static Currency Twenty { get; } = new Currency("twenty", "twenties", 2000);
+        public static Currency Ten { get; } = new Currency("ten", "tens", 1000);
+        public static Currency Five { get; } = new Currency("five", "fives", 500);
+        public static Currency Dollar { get; } = new Currency("dollar", "dollars", 100);
+        public static Currency Quarter { get; } = new Currency("quarter", "quarters", 25);
+        public static Currency Dime { get; } = new Currency("dime", "dimes", 10);
+        public static Currency Nickel { get; } = new Currency("nickel", "nickels", 5);
+        public static Currency Penny { get; } = new Currency("penny", "pennies", 1);
+
+        public static IEnumerable<Currency> List()
+        {
+            return new[] { Hundred, Fifty, Twenty, Ten, Five, Dollar, Quarter, Dime, Nickel, Penny };
+        }
+
+        private Currency(string name, string plural, int value)
+        {
+            Name = name;
+            Plural = plural;
+            Value = value;
+        }
+
+        public string Name { get; private set; }
+        public string Plural { get; private set; }
+        public int Value { get; private set; }
+    }
+}

Files/input.txt

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+2.12,3.00
+1.97,2.00
+3.33,5.00
+5.00,3.33
+3.33,5.00
+1.97, 2.00
+34, 50
+3.330,5.000
+32.45,42.4
+this,that

IChangeCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegister
+{
+    public interface IChangeCalculator
+    {
+        IList<(Currency, int)> GetChange(int changeAmount);
+    }
+}

MinimumChangeCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegister
+{
+    public class MinimumChangeCalculator : IChangeCalculator
+    {
+        public IList<(Currency, int)> GetChange(int changeAmount)
+        {
+            List<(Currency Currency, int Quantity)> change = new List<(Currency Currency, int Quantity)>();
+
+            foreach (var currency in Currency.List())
+            {
+                if (changeAmount >= currency.Value)
+                {
+                    int quantity = changeAmount / currency.Value;
+                    change.Add((Currency: currency, Quantity: quantity));
+                    changeAmount -= currency.Value * quantity;
+                }
+            }
+
+            return change;
+        }
+    }
+}

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.IO;
+using System.Text.RegularExpressions;
+
+namespace SWCashRegister
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string line;
+
+            if (!System.IO.File.Exists("input.txt"))
+            {
+                Console.WriteLine("Could not find file input.txt.");
+                return;
+            }
+
+            try
+            {
+                using (var input = new StreamReader("input.txt"))
+                using (var output = new StreamWriter("output.txt"))
+                {
+                    while ((line = input.ReadLine()) != null)
+                    {
+                        if (!ValidateLine(line))
+                        {
+                            Console.WriteLine($"Found invalid value: {line}");
+                            continue;
+                        }
+
+                        var values = line.Split(',');
+                        int price = (int)(Convert.ToDecimal(values[0]) * 100);
+                        int amountPaid = (int)(Convert.ToDecimal(values[1]) * 100);
+
+                        if (amountPaid < price)
+                        {
+                            Console.WriteLine($"Insufficient funds: {line}");
+                            continue;
+                        }
+
+                        int changeAmount = amountPaid - price;
+
+                        IChangeCalculator calculator = ChangeCalculatorFactory.GetChangeCalculator(price);
+                        output.WriteLine(PrintChange(calculator.GetChange(changeAmount)));
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+            finally
+            {
+                Console.WriteLine("Press any key to quit.");
+                Console.ReadKey();
+            }
+        }
+
+        /// <summary>
+        /// Returns true if the line contains two decimal values, separated by a comma
+        /// </summary>
+        /// <param name="line"></param>
+        /// <returns>True if line is correctly formatted</returns>
+        public static bool ValidateLine(string line)
+        {
+            var regex = new Regex(@"^\d+\.\d{2}\,\d+\.\d{2}$");
+            return regex.IsMatch(line) ;
+        }
+
+        /// <summary>
+        /// Gets a text description of change quantities.
+        /// </summary>
+        /// <param name="change">A list mapping a currency to a quantity</param>
+        /// <returns>Description of change.</returns>
+        public static string PrintChange(IList<(Currency Currency, int Quantity)> change)
+        {
+            List<string> changeText = new List<string>();
+
+            var sortedChange = change
+                .GroupBy(x => x.Currency)
+                .Select(g => new {
+                    Currency = g.Key,
+                    Quantity = g.Sum(x => x.Quantity)
+                })
+                .OrderByDescending(x => x.Currency.Value);
+
+            foreach (var denomination in sortedChange)
+            {
+                changeText.Add($"{denomination.Quantity} {(denomination.Quantity == 1 ? denomination.Currency.Name : denomination.Currency.Plural)}");
+            }
+
+            return String.Join(",", changeText);
+        }
+    }
+}

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("SWCashRegister")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SWCashRegister")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[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("83c9c135-36e1-4d63-bb89-04367da7da25")]
+
+// 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")]

RandomChangeCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SWCashRegister
+{
+    public class RandomChangeCalculator : IChangeCalculator
+    {
+        public IList<(Currency, int)> GetChange(int changeAmount)
+        {
+            List<(Currency Currency, int Quantity)> change = new List<(Currency Currency, int Quantity)>();
+            Random random = new Random();
+
+            while (changeAmount > 0)
+            {
+                List<Currency> availableCurrencies = Currency.List().Where(x => x.Value <= changeAmount).ToList();
+                int index = random.Next(0, availableCurrencies.Count());
+                Currency currency = availableCurrencies[index];
+                change.Add((Currency: currency, Quantity: 1));
+                changeAmount -= currency.Value;
+            }
+
+            return change;
+        }
+    }
+}

SWCashRegister.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>{83C9C135-36E1-4D63-BB89-04367DA7DA25}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>SWCashRegister</RootNamespace>
+    <AssemblyName>SWCashRegister</AssemblyName>
+    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+    <TargetFrameworkProfile />
+  </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="ChangeCalculatorFactory.cs" />
+    <Compile Include="Currency.cs" />
+    <Compile Include="IChangeCalculator.cs" />
+    <Compile Include="MinimumChangeCalculator.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="RandomChangeCalculator.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Files\input.txt" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

SWCashRegister.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28010.2026
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SWCashRegister", "SWCashRegister.csproj", "{83C9C135-36E1-4D63-BB89-04367DA7DA25}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{83C9C135-36E1-4D63-BB89-04367DA7DA25}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{83C9C135-36E1-4D63-BB89-04367DA7DA25}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{83C9C135-36E1-4D63-BB89-04367DA7DA25}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{83C9C135-36E1-4D63-BB89-04367DA7DA25}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {09B5569E-E268-4199-994A-FE759C731E19}
+	EndGlobalSection
+EndGlobal