GTK Calculator

A simple calculator application built with C and GTK3.

Features

• Basic arithmetic operations: addition, subtraction, multiplication, and division
• Decimal point support
• Clear button (C) to reset the calculator
• Backspace button (⌫) to delete the last digit
• Improved error handling for division by zero and invalid operations
• Better visual feedback with button highlighting
• Responsive UI with improved styling

Requirements

• GCC compiler
• GTK3 development libraries
• Math library (libm)

Building the Application

To build the calculator, make sure you have the required dependencies installed:

Ubuntu/Debian

sudo apt-get install build-essential libgtk-3-dev

Fedora

sudo dnf install gcc gtk3-devel

Arch Linux

sudo pacman -S gcc gtk3

Then, build the application:

make

Running the Calculator

After building, run the calculator with:

./calculator

Usage

• Click the number buttons (0-9) to input numbers
• Click the decimal point (.) button to add a decimal point
• Click operation buttons (+, -, *, /) to perform arithmetic operations
• Click the equals (=) button to calculate the result
• Click the clear (C) button to reset the calculator
• Click the backspace (⌫) button to delete the last digit

Keyboard Shortcuts

The calculator also supports keyboard input:

• Number keys (0-9) for entering digits
• Period (.) for decimal point
• Operation keys (+, -, *, /) for arithmetic operations
• Enter or = for calculating the result
• Escape or 'c' key for clearing the calculator
• Backspace for deleting the last digit

Code Structure

The calculator has been refactored to use a more modular approach:

• Calculator state is encapsulated in a struct
• Improved error handling for mathematical operations
• Better visual feedback with CSS styling
• Cleaner code organization with proper documentation

Cleaning Up

To clean the build files:

make clean