🧮 Simple CLI Calculator

A simple command-line calculator built in C# for practicing basic programming concepts, clean code organization, and modular design.
This project supports multiple operations and includes input validation and reusable helper utilities.

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🚀 Features

• ➕ Addition
• ➖ Subtraction
• ✖️ Multiplication
• ➗ Division (with division-by-zero validation)
• 🔁 Option to continue the current operation or return to the main menu
• 🧰 Reusable utility classes for input handling and menu navigation
• 🎨 Clean and organized console layout for better readability

🧩 Project Structure

SimpleCalculator/
├── Program.cs # Main menu and program loop
├── Operations/ # All math operations
│ ├── Addition.cs
│ ├── Subtraction.cs
│ ├── Multiplication.cs
│ └── Division.cs
└── Utils/ # Shared helper classes
  ├── InputReader.cs
  └── MenuHelper.cs

🛠️ Technologies Used

• Language: C#
• Runtime: .NET SDK (version 8.0 or later recommended)
• Editor: Visual Studio Code

⚙️ How to Run

1. Clone the repository

   git clone https://github.com/tarsilafritz/cli-simple-calculator.git
   cd cli-simple-calculator

2. Build the project

    dotnet build

3. Run the calculator

    dotnet run
   

🧠 Example Usage

Hello, welcome to the calculator program!

=== Menu of operations: ===
1. Addition
2. Subtraction
3. Multiplication
4. Division
5. Exit
Please select an operation (1-5): 4


=====================================================================

4. Division
Inform the first value: 12
Inform the second value: 0
❌ You cannot divide by zero!
Please enter a non-zero divisor: 4

Do you want to add another value to the calculation? (Y/N): Y
Inform the next value: 2

Do you want to add another value to the calculation? (Y/N): N

The final result is: 1.5

Would you like to:
  [C] Continue Division
  [M] Return to main menu
Choose an option (C/M): C


=====================================================================

4. Division
Inform the first value: 100
Inform the second value: 25

Do you want to add another value to the calculation? (Y/N): N

The final result is: 4

Would you like to:
  [C] Continue Division
  [M] Return to main menu
Choose an option (C/M): M


=====================================================================

=== Menu of operations: ===
1. Addition
2. Subtraction
3. Multiplication
4. Division
5. Exit
Please select an operation (1-5): 5

Thanks for using our calculator program!

🌱 Future Improvements

• Support for power, square root, and percentage
• Add history tracking for previous results
• Implement unit tests
• Improve menu visuals with color and better formatting

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👨‍💻 Created by @tarsilafritz