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m1nh4ke Jan 31, 2026
98466dc
Improve user input handling and validation
m1nh4ke Feb 1, 2026
aabbfbb
Rename methods for consistent casing
m1nh4ke Feb 1, 2026
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255 changes: 255 additions & 0 deletions Program.cs
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using System.Diagnostics;

// Boolean to determine whether to exit the program
bool exit = false;

// Array to save user's results
List<string> gameHistory = new List<string>();

// Difficulty
int difficulty = 10;

// Show menu to player
void ShowMenu()
{
Console.WriteLine("Please enter a number to select the operation you want to practice:");
Console.WriteLine("\t1. Summation");
Console.WriteLine("\t2. Subtraction");
Console.WriteLine("\t3. Multiplication");
Console.WriteLine("\t4. Division");
Console.WriteLine("\t5. Random");
Console.WriteLine("\t6. Show history");
Console.WriteLine("\t7. Change difficulty");
Console.WriteLine("\t8. Exit");
}

// Get user's input and return an integer to choose operation
int GetUserInput()
{
string input = Console.ReadLine() ?? "";
input = input.Trim().ToLower();
int choice;

try
{
choice = int.Parse(input);
if (0 < choice && choice < 9)
return choice;
else
{
Console.WriteLine("Please enter a valid option.");
return GetUserInput();
}
}
catch
{
Console.WriteLine("Please enter a valid option.");
return GetUserInput();
}
}

void ShowHistory()
{
for(int i = 0; i < gameHistory.Count; i++)
{
Console.WriteLine($"Q{i+1}: {gameHistory[i]}");
}
Console.Write("\n");
}

string GetDifficulty()
{
// Get current difficulty
string currentDifficulty = "";
if(difficulty == 1)
currentDifficulty = "Easy";
else if(difficulty == 10)
currentDifficulty = "Normal";
else if(difficulty == 100)
currentDifficulty = "Hard";
else
currentDifficulty = "ASIAN!";
return currentDifficulty;
}

void ChangeDifficulty()
{
Console.WriteLine("Choose your difficulty:");
Console.WriteLine("\t1. Easy");
Console.WriteLine("\t2. Normal");
Console.WriteLine("\t3. Hard");
Console.WriteLine("\t4. ASIAN!");
Console.WriteLine($"Current difficulty: {GetDifficulty()}");

string userChoice = Console.ReadLine() ?? "";
userChoice = userChoice.Trim().ToLower();
int newDifficulty;
bool getUserChoice = int.TryParse(userChoice, out newDifficulty);

// Return if cannot get valid input
if(getUserChoice == false)
{
Console.WriteLine("Invalid input! Cannot change your difficulty!");
return;
}
// Change difficulty
switch (newDifficulty)
{
case 1:
difficulty = 1;
break;
case 2:
difficulty = 10;
break;
case 3:
difficulty = 100;
break;
case 4:
difficulty = 10000;
break;
}
Console.WriteLine($"Your new difficulty is {GetDifficulty()}\n");
}

int MathQuestion(int firstNumber, int secondNumber, char operation)
{
int result = 0;

switch (operation)
{
case '+':
result = firstNumber + secondNumber;
break;
case '-':
result = firstNumber - secondNumber;
break;
case '*':
result = firstNumber * secondNumber;
break;
case '/':
result = firstNumber / secondNumber;
break;
}
gameHistory.Add($"{firstNumber} {operation} {secondNumber} = {result}");
return result;
}

void StartGame(char operation)
{
// Variables to generate questions
Random generateNumber = new Random();
int first = 0, second = 0;
bool isRandom = operation == 'r';

// User variables
int userPoint = 0;
bool correctAnswer;

// Start timer
Stopwatch stopwatch = Stopwatch.StartNew();

for(int i = 0; i < 5; i++)
{
if (isRandom)
{
// Generate random operation
char[] operations = {'+', '-', '*', '/'};
Random random = new Random();
operation = operations[random.Next(0, 4)];
}
if(operation == '+')
{
first = generateNumber.Next(0, 10 * difficulty);
second = generateNumber.Next(0, 10 * difficulty);
}
else if (operation == '-')
{
first = generateNumber.Next(1, 10 * difficulty);
second = generateNumber.Next(0, first);
}
else if(operation == '*')
{
first = generateNumber.Next(1, 3 * difficulty);
second = generateNumber.Next(1, 3 * difficulty);
}
else
{
second = generateNumber.Next(1, 3 * difficulty);
int tmp = generateNumber.Next(1, 3 * difficulty);
first = tmp * second;
}
Console.Write($"Question {i+1}:\t");
int res = MathQuestion(first, second, operation);
Console.Write($"{first} {operation} {second} = ");
string? answer = Console.ReadLine();

int userAnswer;
bool getUserAnswer = int.TryParse(answer, out userAnswer);
correctAnswer = userAnswer.Equals(res);

if (getUserAnswer == false)
{
Console.WriteLine("Invalid input.\nYou won't have any point for this answer!\n");
correctAnswer = false;
}

if(correctAnswer == true)
{
userPoint += 1;
Console.WriteLine($"Correct! The answer is {res}\n");
}
else
{
Console.WriteLine($"Wrong! The correct answer is {res}\n");
}
}
// Get the total seconds as a double
double exactSeconds = stopwatch.Elapsed.TotalSeconds;
// Round up total seconds
int roundedUpSeconds = (int)Math.Ceiling(exactSeconds);

// Display game result
Console.WriteLine($"You have successfully answered {userPoint}/5 questions!");
Console.WriteLine($"Total time: {roundedUpSeconds} seconds.\n");
}

while(exit == false)
{
ShowMenu();
int userChoice = GetUserInput();
char operation;

switch (userChoice)
{
case 1:
operation = '+';
StartGame(operation);
break;
case 2:
operation = '-';
StartGame(operation);
break;
case 3:
operation = '*';
StartGame(operation);
break;
case 4:
operation = '/';
StartGame(operation);
break;
case 5:
operation = 'r';
StartGame(operation);
break;
case 6:
ShowHistory();
break;
case 7:
ChangeDifficulty();
break;
default:
Console.WriteLine("Game closed!");
exit = true;
break;
}
}
10 changes: 10 additions & 0 deletions mathGame.m1nh4ke.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>

</Project>
24 changes: 24 additions & 0 deletions mathGame.m1nh4ke.sln
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Microsoft Visual Studio Solution File, Format Version 12.00
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VisualStudioVersion = 17.5.2.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "mathGame.m1nh4ke", "mathGame.m1nh4ke.csproj", "{A24CAC86-24D6-8CA4-38B9-D1A4B8476AEA}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{A24CAC86-24D6-8CA4-38B9-D1A4B8476AEA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{A24CAC86-24D6-8CA4-38B9-D1A4B8476AEA}.Debug|Any CPU.Build.0 = Debug|Any CPU
{A24CAC86-24D6-8CA4-38B9-D1A4B8476AEA}.Release|Any CPU.ActiveCfg = Release|Any CPU
{A24CAC86-24D6-8CA4-38B9-D1A4B8476AEA}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {4B21904C-AF95-4055-853B-D5449545C2FE}
EndGlobalSection
EndGlobal