This repository contains a collection of small C projects designed to help you practice, experiment, and understand core programming concepts in C.
Each project has a specific purpose (graphics, algorithms, memory handling, etc.) and is categorized by difficulty level (⭐ 1 – 5) taken from the internal pagella.
- Improve your understanding of the C language.
- Train your algorithmic thinking and manual memory-management skills.
- Explore concepts like 2D graphics, physics simulation, data structures, and more.
- Prepare for exams, coding challenges, or just learn for fun.
- Caesar Chipher — Implementation of the classical Caesar shift cipher.
- Vigenère Cipher — A straightforward command‑line tool that encrypts a message with a Vigenère‑like cipher.
- File Obfuscator — A C utility that applies a bitwise NOT or a byte-wise XOR to the contents of a file and writes the transformed bytes to an output file.
- Happy Number Checker — A tiny command‑line utility that determines whether a given integer is a happy number.
- Sieve of Eratosthenes — A simple Sieve of Eratosthenes.
- Pascal's Triangle — A C program that requests an integer
row ≥ 1from the user and prints Pascal’s Triangle up to that row. - Credit Card Validator — A command‑line utility that checks whether a numeric string passes the Luhn checksum.
- Collatz Conjecture — Given an integer n, this program repeatedly applies the Collatz rules.
- FizzBuzz — A program that prints numbers from 1 to n, replacing multiples of 3 with "Fizz", multiples of 5 with "Buzz", and multiples of both with "FizzBuzz".
- TCP Client/Server — A simple implementation of a TCP client and server.
- Temperature Converter — A simple command-line C program to convert temperatures between Celsius (C), Fahrenheit (F), and Kelvin (K).
- Palindrome checker — A program that checks whether a string passed via the command line is a palindrome
- Number Base Converter — A command-line tool written in C to convert numbers between Decimal, Binary, and Hexadecimal systems.
- Word and Character Counter — A program that reads a text file and counts the number of words and the number of characters.
- Binary Search — A binary search implementation.
- Stack and Queue — Implementations of the data structures stack and queue.
- Number‑to‑Words Converter — A program that converts an integer in the range 0 – 9999 into its English words representation.
- libcurl GET Client — A minimal example program that performs an HTTP GET request using libcurl.
- Mandelbrot Set — Render the Mandelbrot set to an SDL window.
- Pong game — A simple two-player Pong clone in C using SDL2 and SDL_ttf, with a basic victory screen.
- N-Queens Solver — Place N queens on an N×N chessboard so none attack each other (no same row, column, or diagonal).
- Tower of Hanoi — Classic recursive solution to the Tower of Hanoi.
- Tic Tac Toe — A classic Tic Tac Toe game where you play against an AI opponent that uses the minimax algorithm.
- Magic Square — This program builds a magic square of size N×N using the classic Siamese method.
- Monte Carlo π Estimator — This program estimates π by randomly sampling points in a square and counting how many fall inside an inscribed circle.
- Barnsley Fern — A program that renders the classic Barnsley Fern fractal.
- Game of life — Implementation of Conway’s Game of Life.
- Flappy Bird — A remake of the iconic Flappy Bird game built with SDL2.
- Ball gravity simulation — An interactive particle sandbox: balls fall, collide with each other (elastic-ish with restitution), bounce on walls/floor, and resolve penetration against obstacles.
- Linux Keylogger — A minimal C program that reads raw key-press events from the Linux evdev interface.
- Raytracer 2D (SDL2) — A simple 2D raytracer that visualizes light interacting with a circle.
- Rotating Cube — A program that renders a rotating 3-D wireframe cube using SDL2.
- ASCII Rotating Cube — Another 3D cube rotating but in the terminal.
- Two-Body Orbit Simulation — A program that simulates a two-body gravitational interaction. A small blue planet orbits a larger yellow body, with a trail showing its past positions.
- Tiny Regex/Grep — A super–small regular‑expression engine (supports
.*^$) and a mini grep that scans stdin or files line‑by‑line. - Plinko — A program that simulates a Plinko board game using SDL2.
- K-Means + Visualization — This project implements the K-means clustering algorithm and visualizes the results.
- Neural Network from scratch — A minimal multi-layer perceptron that learns the XOR function using stochastic gradient descent, binary cross-entropy, and sigmoid activations.
- Double Pendulum — A program that simulates a double pendulum.
- Three-Body Problem — A leap-frog integrator simulating the famous three-body figure-8 orbit and drawing trails.
- A* visualization — A program to visualize the A* pathfinding algorithm.
- Graph Visualizer with Bellman-Ford & Dijkstra Algorithm — An interactive graph visualizer that implements the Bellman-Ford algorithm to find the shortest path between nodes.
- MD5 Implementation — Implementation of the MD5 algorithm.
- RSA Encryption and Decryption with GMP — RSA implementation using C and the GMP library for handling big numbers.
- Sudoku Generator & Solver — Generates a fully‑valid Sudoku and solves it with backtracking.
- Shell — A minimal command-line shell-like emulator written in C using the ncurses library.
- Black Hole - 2D — A program that traces light rays’ paths around a black hole using the geodesic equations of the Schwarzschild metric. It visually demonstrates how spacetime curvature bends ray trajectories with dynamic animations and colorful trails
- Ping from Scratch — Just reimplementing the ping command from scratch.
- AES-128 — A minimal implementation of core AES-128 encryption & decryption steps.
- Liquid simulation — A program that simulates water flowing through a grid of square cells using a very simple cellular model.
This repository is a work in progress. New projects will be added over time.
Feel free to open an issue or pull request if you want to contribute, suggest ideas, or report bugs.