Modern Calculator

A beautiful, modern calculator application built with C++ and Qt6, featuring a sleek dark theme and intuitive user interface.

Features

• Modern Dark Theme: Sleek, eye-friendly dark interface
• Full Calculator Functionality: Addition, subtraction, multiplication, division
• Additional Functions: Percentage, plus/minus toggle, clear functions
• Responsive Design: Clean, modern button layout with hover effects
• Keyboard Support: Full keyboard input support
• Error Handling: Proper error handling for division by zero

Screenshots

The calculator features:

• Large, easy-to-read display
• Color-coded buttons (gray for functions, orange for operators, dark for numbers)
• Smooth hover effects and animations
• Professional appearance inspired by modern mobile calculators

Requirements

• Qt6: Qt6 Widgets module
• CMake: Version 3.16 or higher
• C++17: Compatible compiler (GCC, Clang, MSVC)

Building the Project

Prerequisites

1. Install Qt6: Download and install Qt6 from qt.io
2. Install CMake: Download from cmake.org

Build Instructions

1. Clone or download the project files

2. Create a build directory:

   mkdir build
   cd build

3. Configure with CMake:

   cmake ..

4. Build the project:

   cmake --build .

5. Run the calculator:

   ./bin/Calculator  # On Linux/macOS
   .\bin\Calculator.exe  # On Windows

Alternative: Using Qt Creator

1. Open Qt Creator
2. Open the CMakeLists.txt file as a project
3. Configure the project with your Qt6 installation
4. Build and run

Running the Project

Method 1: Using Build Scripts (Recommended)

Windows

1. Double-click build.bat or run it from Command Prompt
2. Wait for the build to complete
3. Navigate to the output directory:

   cd build\bin\Release

4. Run the calculator:

   Calculator.exe

Linux/macOS

1. Make the script executable (if needed):

   chmod +x build.sh

2. Run the build script:

   ./build.sh

3. Run the calculator:

   ./build/bin/Calculator

Method 2: Manual Build and Run

Step-by-step Instructions

1. Open Terminal/Command Prompt in the project directory

2. Create and enter build directory:

   mkdir build
   cd build

3. Configure the project:

   cmake ..

4. Build the project:

   cmake --build . --config Release

5. Navigate to the executable location:

   • Windows: build\bin\Release\
   • Linux/macOS: build\bin\

6. Run the calculator:

   • Windows: Calculator.exe
   • Linux/macOS: ./Calculator

Method 3: Using Qt Creator IDE

1. Open Qt Creator
2. Open Project: File → Open File or Project → Select CMakeLists.txt
3. Configure Project: Choose your Qt6 kit and compiler
4. Build Project: Click the hammer icon or press Ctrl+B
5. Run Project: Click the play button or press Ctrl+R

Method 4: Using Visual Studio (Windows)

1. Open Visual Studio
2. Open Folder: File → Open → Folder → Select project directory
3. Configure: Select CMake configuration when prompted
4. Build: Build → Build All (Ctrl+Shift+B)
5. Run: Debug → Start Debugging (F5) or Start Without Debugging (Ctrl+F5)

Method 5: Using VS Code

1. Install Extensions: C/C++, CMake Tools
2. Open Project: File → Open Folder → Select project directory
3. Configure: Press Ctrl+Shift+P → "CMake: Configure"
4. Build: Press Ctrl+Shift+P → "CMake: Build"
5. Run: Press F5 or Ctrl+Shift+P → "CMake: Run Without Debugging"

Usage

Mouse/Touch Input

• Click number buttons (0-9) to input numbers
• Click operator buttons (+, -, ×, ÷) to perform calculations
• Click "=" to see the result
• Click "AC" to clear all
• Click "+/-" to toggle between positive and negative
• Click "%" to convert to percentage

Keyboard Input

• Numbers: 0-9 keys
• Operators: +, -, *, / keys
• Equals: Enter or Return key
• Clear: Escape key
• Decimal: Period key
• Backspace: Backspace key

Project Structure

Calculator/
├── CMakeLists.txt      # Build configuration
├── main.cpp           # Application entry point
├── calculator.h       # Calculator class header
├── calculator.cpp     # Calculator class implementation
├── calculator.ui      # UI file (minimal, UI built programmatically)
├── build.bat         # Windows build script
├── build.sh          # Linux/macOS build script
└── README.md         # This file

Customization

The calculator uses CSS-like styling through Qt's stylesheet system. You can customize:

• Colors: Modify the color values in the button styles
• Sizes: Change button sizes and window dimensions
• Fonts: Adjust font sizes and families
• Layout: Modify spacing and margins

Troubleshooting

Common Issues

1. Qt6 not found: Ensure Qt6 is properly installed and CMake can find it
2. Build errors: Make sure you have a C++17 compatible compiler
3. Runtime errors: Ensure Qt6 runtime libraries are in your PATH

Windows-specific Notes

• Use Visual Studio or MinGW-w64 as your compiler
• Ensure Qt6 binaries are in your system PATH
• Consider using Qt's official installer for easier setup

Linux-specific Notes

• Install Qt6 development packages: sudo apt install qt6-base-dev (Ubuntu/Debian)
• Install CMake: sudo apt install cmake (Ubuntu/Debian)
• Ensure you have a C++ compiler: sudo apt install build-essential

macOS-specific Notes

• Install Qt6 via Homebrew: brew install qt6
• Install CMake: brew install cmake
• Install Xcode Command Line Tools: xcode-select --install

Runtime Issues

"Application failed to start" (Windows)

• Ensure Qt6 runtime DLLs are in your PATH
• Copy Qt6 DLLs to the executable directory
• Use Qt's windeployqt tool to package dependencies

"Library not found" (Linux/macOS)

• Install Qt6 runtime libraries
• Set LD_LIBRARY_PATH (Linux) or DYLD_LIBRARY_PATH (macOS)
• Use Qt's macdeployqt tool (macOS)

"Permission denied" (Linux/macOS)

• Make the executable file executable: chmod +x Calculator

License

This project is open source and available under the MIT License.

Contributing

Feel free to submit issues, feature requests, or pull requests to improve the calculator!