Calculator - ready for review

Calculator.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Calculator", "TCSA.Calculator\Calculator.csproj", "{8235EA08-A7BE-4654-99D9-F96EB4884C06}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CalculatorLibrary", "CalculatorLibrary\CalculatorLibrary.csproj", "{4639BC5A-00B5-4014-90BE-A04CEF4D0211}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8235EA08-A7BE-4654-99D9-F96EB4884C06}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8235EA08-A7BE-4654-99D9-F96EB4884C06}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8235EA08-A7BE-4654-99D9-F96EB4884C06}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8235EA08-A7BE-4654-99D9-F96EB4884C06}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4639BC5A-00B5-4014-90BE-A04CEF4D0211}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4639BC5A-00B5-4014-90BE-A04CEF4D0211}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4639BC5A-00B5-4014-90BE-A04CEF4D0211}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4639BC5A-00B5-4014-90BE-A04CEF4D0211}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

CalculatorLibrary/Calculator.cs

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+using CalculatorLibrary.Models;
+using Newtonsoft.Json;
+
+namespace CalculatorLibrary;
+
+public class Calculator
+{
+    public double DoOperation(string op, double num1, double num2 = 0)
+    {
+        double
+            result = double.NaN; // Default value is "not-a-number" if an operation, such as division, could result in an error.
+
+        // Use a switch statement to do the math.
+        switch (op)
+        {
+            case "a":
+                result = num1 + num2;
+                break;
+            case "s":
+                result = num1 - num2;
+                break;
+            case "m":
+                result = num1 * num2;
+                break;
+            case "d":
+                if (num2 != 0)
+                {
+                    result = num1 / num2;
+                }
+                break;
+            case "p":
+                result = Math.Pow(num1, num2);
+                break;
+            case "r":
+                result = Math.Sqrt(num1);
+                break;
+            case "x":
+                result = num1 * 10;
+                break;
+            case "sin":
+                double radians = num1 * Math.PI / 180;
+                result = Math.Sin(radians);
+                break;
+            case "cos":
+                radians = num1 * Math.PI / 180;
+                result = Math.Cos(radians);
+                break;
+            case "tan":
+                radians = num1 * Math.PI / 180;
+                result = Math.Tan(radians);
+                break;
+        }
+
+        Calculation calculation = new Calculation();
+        calculation.Operand1 = num1;
+        calculation.Operand2 = num2;
+        calculation.Operation = op;
+        calculation.Result = result;
+
+        var history = GetHistory();
+        history.Operations.Add(calculation);
+        string json = JsonConvert.SerializeObject(history);
+        File.WriteAllText("calculationlog.json", json);
+
+        return result;
+    }
+
+    public CalculationHistory GetHistory()
+    {
+        var historyObject = new CalculationHistory();
+        if (File.Exists("calculationlog.json"))
+        {
+            using StreamReader streamReader = new StreamReader("calculationlog.json");
+            var history = streamReader.ReadToEnd();
+            historyObject = JsonConvert.DeserializeObject<CalculationHistory>(history);
+        }
+        return historyObject;
+    }
+
+    public void ClearHistory()
+    {
+        File.Delete("calculationlog.json");
+    }
+}

CalculatorLibrary/CalculatorLibrary.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Newtonsoft.Json" Version="13.0.5-beta1" />
+    </ItemGroup>
+
+</Project>

CalculatorLibrary/Models/Calculation.cs

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+namespace CalculatorLibrary.Models;
+
+public class Calculation
+{
+    public double Operand1 { get; set; }
+    public double Operand2 { get; set; }
+    public string Operation { get; set; }
+    public double Result  { get; set; }
+}

CalculatorLibrary/Models/CalculationHistory.cs

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+namespace CalculatorLibrary.Models;
+
+public class CalculationHistory
+{
+    public List<Calculation> Operations { get; set; } = new List<Calculation>();
+}

TCSA.Calculator/Calculator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\CalculatorLibrary\CalculatorLibrary.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Spectre.Console" Version="0.57.3-alpha.0.13" />
+    </ItemGroup>
+
+</Project>