Calc

A lightweight command-line calculator written in C.

Features

• Variables: x=10, y=x*2, chain assign x=y=z, unset x, vars

• Equation Solving:

  • Linear: x+12=15
  • Quadratic: 4x^2-5x-12=0
  • Simultaneous: 7x+2y=24; 8x+2y=30

• Implicit Multiplication: 2x, (a)(b)

• UI: GNU-style interface with Ctrl-C (quit) and Ctrl-H (help).

• Line Editing: Left/Right arrows, Backspace, Insertion.

• History: Up/Down arrows.

Build & Install

# Build
make

# Run
./build/calc

# Install (optional)
sudo make install

Building for Windows (Cross-Compilation)

To compile for Windows on Linux (requires mingw-w64):

make -f Makefile.win

The executable calc.exe will be found in the build-win directory.

Building with CMake (Cross-Platform)

You can also use CMake to build the project on Linux, Windows, or macOS.

mkdir build
cd build
cmake ..
cmake --build .

To run tests (if configured):

ctest

Usage

CI/CD Artifacts

This project uses GitHub Actions for continuous integration.

• Build Artifacts: on every push to main or pull request, the workflow builds the calculator.
• Download: You can download the compiled executable (calc for Linux/macOS, calc.exe for Windows) from the Actions tab in GitHub > select the run > Artifacts.
• Releases: When a new tag (e.g. v1.0.0) is pushed, a GitHub Release is automatically created, and the Linux/Windows binaries are attached to it.

Versioning

The project uses dynamic versioning based on git tags.

• The build system automatically extracts the version using git describe.
• The version string (e.g., v1.0.0-3-g1a2b3c) is displayed in the startup banner.

calc> 10 + 5
= 15
calc> x = 10
= 10
calc> 2sin(0) + x
= 10