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Calculator.slnx

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+<Solution>
+  <Project Path="Calculator/Calculator.csproj" />
+  <Project Path="CalculatorLibrary/CalculatorLibrary.csproj" Id="20872eb0-c07f-4f10-8ccf-780139815f00" />
+  <Project Path="Menu/Menu.csproj" Id="8df53b1f-5192-45d6-b2ef-5d16d7eb2c4d" />
+</Solution>

Calculator/Calculator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CalculatorLibrary\CalculatorLibrary.csproj" />
+    <ProjectReference Include="..\Menu\Menu.csproj" />
+  </ItemGroup>
+
+</Project>

Calculator/Program.cs

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+using System.Text.RegularExpressions;
+using CalculatorLibrary;
+using Menu;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        // Declare variables to run the app
+        bool endApp = false;
+        int cntUsing = 0;
+        double ans = 0;
+        List<string> history = new List<string>();
+
+        // Display title as the C# console calculator app
+        Console.WriteLine("Console Calculator in C#\r");
+        Console.WriteLine("------------------------\n");
+
+        Calculator calculator = new Calculator();
+
+        while (!endApp)
+        {
+            cntUsing++;
+            int menuChoice = Menu.Menu.ShowMenu();
+
+            switch (menuChoice)
+            {
+                case 1: // New calculation
+                        // Declare variables and set to empty
+                        // Use Nullable types (with ?) wo match type of System.Console.ReadLine
+                    string? numInput1 = "";
+                    string? numInput2 = "";
+                    double result = 0;
+
+                    // Ask the user to type the first number
+                    Console.Write("Type a number, and then press Enter: ");
+                    numInput1 = Console.ReadLine();
+
+                    double cleanNum1 = 0;
+                    while (!double.TryParse(numInput1, out cleanNum1))
+                    {
+                        if (numInput1.ToLower().Equals("ans"))
+                        {
+                            cleanNum1 = ans;
+                            break;
+                        }
+                        Console.Write("This is not a valid input. Please enter a numeric value: ");
+                        numInput1 = Console.ReadLine();
+                    }
+
+                    // Ask the user to choose an operator
+                    Console.WriteLine("Choose an operator from the following list:");
+                    Console.WriteLine("\ta - Add");
+                    Console.WriteLine("\ts - Subtract");
+                    Console.WriteLine("\tm - Multiply");
+                    Console.WriteLine("\td - Divide");
+                    Console.WriteLine("\tsq - Square Root");
+                    Console.WriteLine("\tp - Power");
+                    Console.WriteLine("\te - 10x");
+                    Console.WriteLine("\tt - Trigonmetric functions");
+                    Console.Write("Your option? ");
+
+                    string? op = Console.ReadLine();
+
+                    // Validate input is not null, and matches the pattern
+                    if (op == null || !Regex.IsMatch(op, "[a|s|m|d|sq|p|e|t]"))
+                    {
+                        Console.WriteLine("Error: Unrecognized input.");
+                    }
+                    else
+                    {
+                        double cleanNum2 = 0;
+                        int functionChoice = 0;
+                        if (op.Equals("t"))
+                        {
+                            Console.WriteLine("Type a number, then press Enter to choose: ");
+                            Console.WriteLine("\t1. Sine");
+                            Console.WriteLine("\t2. Cosine");
+                            Console.WriteLine("\t3. Tangent");
+                            Console.WriteLine("\t4. Cotangent");
+                            string? functionInput = Console.ReadLine();
+                            while (!int.TryParse(functionInput, out functionChoice) || functionChoice < 1 || functionChoice > 4)
+                            {
+                                Console.Write("This is not a valid input. Please enter a number from 1 to 3: ");
+                                functionInput = Console.ReadLine();
+                            }
+                        }
+                        else if (!op.Equals("sq") && !op.Equals("e"))
+                        {
+                            // Ask the user to type the second number
+                            Console.Write("Type another number, and then press Enter: ");
+                            numInput2 = Console.ReadLine();
+
+                            while (!double.TryParse(numInput2, out cleanNum2))
+                            {
+                                if (numInput2.ToLower().Equals("ans"))
+                                {
+                                    cleanNum2 = ans;
+                                    break;
+                                }
+                                Console.Write("This is not valid input. Please enter a numeric value: ");
+                                numInput2 = Console.ReadLine();
+                            }
+                        }
+                        try
+                        {
+                            result = calculator.DoOperation(cleanNum1, op, cleanNum2, functionChoice);
+                            if (double.IsNaN(result))
+                            {
+                                Console.WriteLine("This operation will result in a mathematical error.\n");
+                            }
+                            else
+                            {
+                                Console.WriteLine("Your result: {0:0.##}\n", result);
+                                history.Add(calculator.SetHistoryString(cleanNum1, op, cleanNum2, functionChoice, result));
+                                ans = result;
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            Console.WriteLine("Oh no! An exception occurred trying to do the math.\n - Details: " + e.Message);
+                        }
+                    }
+                    Console.WriteLine("------------------------\n");
+                    break;
+                case 2: // Show history
+                    Console.WriteLine("Calculation history:");
+                    foreach(string s in history)
+                        Console.WriteLine(s);
+                    Console.WriteLine();
+                    break;
+                case 3: // Delete history
+                    history.Clear();
+                    Console.WriteLine("Calculation history deleted.");
+                    break;
+                default:
+                    break;
+            }
+
+            // Wait for the user to respond before closing.
+            Console.Write("Press 'n' and Enter to close the app, or press any other key and Enter to continue: ");
+            if (Console.ReadLine() == "n") endApp = true;
+        }
+        Console.WriteLine($"You have used the calculator {cntUsing} times.");
+        Console.WriteLine("\n"); // Friendly linespacing.
+        calculator.Finish();
+        return;
+    }
+}

Calculator/bin/Debug/net9.0/Calculator.deps.json

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+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v9.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v9.0": {
+      "Calculator/1.0.0": {
+        "dependencies": {
+          "CalculatorLibrary": "1.0.0",
+          "Menu": "1.0.0"
+        },
+        "runtime": {
+          "Calculator.dll": {}
+        }
+      },
+      "Newtonsoft.Json/13.0.4": {
+        "runtime": {
+          "lib/net6.0/Newtonsoft.Json.dll": {
+            "assemblyVersion": "13.0.0.0",
+            "fileVersion": "13.0.4.30916"
+          }
+        }
+      },
+      "CalculatorLibrary/1.0.0": {
+        "dependencies": {
+          "Newtonsoft.Json": "13.0.4"
+        },
+        "runtime": {
+          "CalculatorLibrary.dll": {
+            "assemblyVersion": "1.0.0.0",
+            "fileVersion": "1.0.0.0"
+          }
+        }
+      },
+      "Menu/1.0.0": {
+        "runtime": {
+          "Menu.dll": {
+            "assemblyVersion": "1.0.0.0",
+            "fileVersion": "1.0.0.0"
+          }
+        }
+      }
+    }
+  },
+  "libraries": {
+    "Calculator/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    },
+    "Newtonsoft.Json/13.0.4": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-pdgNNMai3zv51W5aq268sujXUyx7SNdE2bj1wZcWjAQrKMFZV260lbqYop1d2GM67JI1huLRwxo9ZqnfF/lC6A==",
+      "path": "newtonsoft.json/13.0.4",
+      "hashPath": "newtonsoft.json.13.0.4.nupkg.sha512"
+    },
+    "CalculatorLibrary/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    },
+    "Menu/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}

Calculator/bin/Debug/net9.0/Calculator.runtimeconfig.json

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+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}

Calculator/bin/Debug/net9.0/calculator.log

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+Starting Calculator Log
+Started 2/6/2026 3:31:44 PM
+3 / 5 = 0.6

Calculator/bin/Debug/net9.0/calculatorlog.json

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+{
+  "Operations": [
+    {
+      "Operand1": 90.0,
+      "Operand2": 0.0,
+      "Operation": "Cosine",
+      "Result": -0.4480736255645752
+    },
+    {
+      "Operand1": 30.0,
+      "Operand2": 3201.0,
+      "Operation": "Add",
+      "Result": 3231.0
+    }
+  ]
+}