Code Review for Math Game

MathGame/MathGame.slnx

@@ -0,0 +1,3 @@
+<Solution>
+  <Project Path="MathGame/MathGame.csproj" />
+</Solution>

MathGame/MathGame/MathGame.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

MathGame/MathGame/Program.cs

@@ -0,0 +1,159 @@
+bool exitGame = false;
+string? input;
+List<int> scores = new List<int>();
+const int NumberOfQuestionsPerGame = 5;
+const int ScorePerQuestion = 10;
+const int MaximumScore = ScorePerQuestion * NumberOfQuestionsPerGame;
+
+do
+{
+    Console.WriteLine("Main menu");
+    Console.WriteLine("Please select a game mode or type \"exit\" to close the app:");
+    Console.WriteLine("1. Addition game");
+    Console.WriteLine("2. Substraction game");
+    Console.WriteLine("3. Multiplication game");
+    Console.WriteLine("4. Division game");
+
+    bool validSelection;
+    do
+    {
+        input = Console.ReadLine();
+        bool inputNotEmpty = input != null && input.Length > 0;
+        validSelection = true;
+
+        if (inputNotEmpty)
+        {
+            string userSelection = input.ToLower();
+            int score;
+            switch (userSelection)
+            {
+                case "exit":
+                    exitGame = true;
+                    break;
+                case "1":
+                    Console.Clear();
+                    score = game(Operations.ADDITION);
+                    scores.Add(score);
+                    Console.WriteLine("Press enter to continue...");
+                    Console.ReadLine();
+                    Console.Clear();
+                    break;
+                case "2":
+                    Console.Clear();
+                    score = game(Operations.SUBSTRACTION);
+                    scores.Add(score);
+                    Console.WriteLine("Press enter to continue...");
+                    Console.ReadLine();
+                    Console.Clear();
+                    break;
+                case "3":
+                    Console.Clear();
+                    score = game(Operations.MULTIPLICATION);
+                    scores.Add(score);
+                    Console.WriteLine("Press enter to continue...");
+                    Console.ReadLine();
+                    Console.Clear();
+                    break;
+                case "4":
+                    Console.Clear();
+                    score = game(Operations.DIVISION);
+                    scores.Add(score);
+                    Console.WriteLine("Press enter to continue...");
+                    Console.ReadLine();
+                    Console.Clear();
+                    break;
+                default:
+                    Console.WriteLine("Invalid selection please try again.");
+                    validSelection = false;
+                    break;
+            }
+        }
+    } while (!validSelection);
+} while (!exitGame);
+
+static List<int> getFactors(int num)
+{
+    List<int> factors = new List<int>();
+
+    for (int i = 1; i <= num; i++)
+    {
+        if (num % i == 0)
+        {
+            factors.Add(i);
+        }
+    }
+
+    return factors;
+}
+
+static int game(Operations operation)
+{
+    int score = 0;
+    char operationSymbol = ((char)operation);
+    int minNumber = 1;
+    int maxNumber = 9;
+
+    Random random = new Random();
+
+    for (int i = 0; i < NumberOfQuestionsPerGame; i++)
+    {
+        int number1 = random.Next(minNumber, maxNumber + 1);
+        int number2;
+        int expectedResult;
+        switch (operation)
+        {
+            case Operations.ADDITION:
+                number2 = random.Next(minNumber, maxNumber + 1);
+                expectedResult = number1 + number2;
+                break;
+            case Operations.SUBSTRACTION:
+                number2 = random.Next(minNumber, maxNumber + 1);
+                expectedResult = number1 - number2;
+                break;
+            case Operations.MULTIPLICATION:
+                number2 = random.Next(minNumber, maxNumber + 1);
+                expectedResult = number1 * number2;
+                break;
+            case Operations.DIVISION:
+                List<int> number1Factors = getFactors(number1);
+                int number2PositionInFactors = random.Next(0, number1Factors.Count);
+                number2 = number1Factors[number2PositionInFactors];
+
+                expectedResult = number1 / number2;
+                break;
+            default:
+                number1 = 1;
+                number2 = 1;
+                expectedResult = 0;
+                break;
+        }
+
+        Console.WriteLine($"Question {i + 1}/{NumberOfQuestionsPerGame}\nWhat is {number1} {operationSymbol} {number2} ?");
+
+        string? input = Console.ReadLine();
+        int userAnswer;
+
+        while (input == null || input.Length == 0 || !int.TryParse(input, out userAnswer))
+        {
+            Console.WriteLine("Your answer must be an integer number.");
+            input = Console.ReadLine();
+        }
+
+        if (userAnswer == expectedResult)
+        {
+            score += ScorePerQuestion;
+        }
+        Console.Clear();
+    }
+
+    Console.WriteLine($"Your score was {score}/{MaximumScore}");
+
+    return score;
+}
+enum Operations
+{
+    ADDITION = '+',
+    SUBSTRACTION = '-',
+    MULTIPLICATION = '*',
+    DIVISION = '/'
+}