Pro/g/ramming Challenges v3.0

001 - Unit Converter (weight, area, length, etc)
002 - 15 Piece Sliding Puzzle Game
003 - Count word occurrences in a text tile
004 - FizzBuzz
005 - Given an IPv4 address and a subnet mask, compute the network, broadcast and first/last host addreses
006 - Binary Search (integers, strings, etc)
007 - BMI Calculator (CLI or GUI)
008 - Currency Converter { Include up-to-date exchange rates from the Internet and other units, commodities, etc & history }
009 - String -> ASCII / Unicode Art Character
010 - Quine
011 - Define, then translate, scale and rotate 2D/3D polygons
012 - Linked list (single, double, circular, skip list, etc)
013 - Calculate and print calendars for arbitrary months and years
014 - Tic-Tac-Toe
015 - Voronoi Diagram from a set of random points
016 - Benford's law
017 - Text <-> Morse code converter
018 - Anagram Checker
019 - Dynamic multidimensional arrays
020 - Sorting algorithms + visulization
021 - Count words in a string { Include lines, sentences, paragraphs, etc }
022 - Palindrome checker
~~023 - Factorial~~
024 - Eulerian trail/path
025 - Read a text tile, then center/right align/justify its contents
026 - Higher/lower, heads/tails
027 - Split a string into tokens delimited by one or mom seperators
028 - Given a directory, recursively search its subdirectories for the smallest & largest tiles; print their full path, name and size.
029 - TCP program with basic encryption (e.g. XOR)
030 - Tornado test/image
031 - Print long passages of text with word wrapping { Include hyphenated words for better wrapping }
032 - Cipher/decipher text (implement at least one from http://rumkin.com/tools/cipher/)
033 - Perlin/simplex noise with parameters
034 - Basic converter (binary, hexadecimal, decimal, octal, etc)
035 - Snake game
036 - Load an image and flip/mirror/rotate it randomly and save it to a new file
037 - Wind chill calculator
038 - ASCII/graphical digital clock
039 - Ulam spiral (display or save the image)
040 - Password/passphrase generator with options
041 - Prime number sieve { Include multi-threading }
042 - Fibonacci sequence (at least the first 100 numbers)
~~043 - Temperature converter~~
044 - Cellular textures
045 - Triangle number calculator
046 - Eight Queens puzzle
047 - Hangman
048 - Check if two 2D rectangles overlap and if they do, calculate the overlapping rectangle
049 - Calculate the days between two dates
050 - Get the current time from a time server and convert it to your local time and display it
051 - Random name generator { Include credentials }
052 - Magic Eight Ball
053 - Dungeons and Dragons { Include Al }
054 - Pascal's triangle generator
055 - Sierpinski triangle
056 - Typing speed calculator
057 - Rock, paper, scissors ( Include Lizard, Spock }
058 - Pong { Include variable vectors }
059 - RPN calculator
060 - Collatz conjecture
061 - Longest common substring Include 0(n) }
062 - Voronoi diagram from a random set of points
063 - Reverse a number mathematically (e.g. 48572 -> 27584)
064 - Luhn algorithm (number validation)
065 - Draw a Circle using ASCII art (let the user specify the radius { Include colouring it with seperate fill and edge colours }
066 - Haiku generator
067 - Connect Four game
068 - 4Chan thread or image downloader { Include both
069 - Generate an ASCII tree (height based on input)
070 - Use genetic algorithm on polygons
071 - Graphical analog clock
072 - Hide and extract data in images (basic steganography)
073 - RT!! client { Include an FTP server }
074 - IMP interpreter
075 - Telnet server { Include client and a netcat clone }
076 - Text editor
077 - N queens problem
078 - Crediential Validator (e.g. phone number, email address, etc)
079 - Mastermind game
080 - Random image generator
081 - Klingon translator
082 - Markov chain (random text generators)
083 - Two seperate languages send strings to one another (Java, Python, etc)
084 - Name art in ASCII
085 - IRC bot
086 - Brainfuck interpreter { Include optimisation and multiple targets }
087 - Chip-8 emulator
088 - Geekcode generator
089 - Solitaire game
090 - Scorched Earth/Tanks clone { Include Al players }
091 - Mandelbrot set { Include Mandelbulb/Mandelbox }
092 - Knights tour
093 - Crossword game
094 - Recursively split an image into rectangles using a quadtree (hint mean squared error)
095 - Random maze generator / solver
096 - An old school demo effect (tunnel, plasma, scrollers, zoomers, etc)
097 - Markov chains (generate random text)
098 - Minesweeper game
099 - Sound synthesis (sine, square, sawtooth, etc) { Include realtime MIDI playback with your custom instruments }
100 - Process large amounts of data in parallel using threads
101 - Enigma simulator with a configuration file { Include decryption of messages without known settings }
102 - Scientific calculator (GUI or CLI)
103 - Towers of Hanoi { Include more disks and more poles }
104 - Level viewer for any game of your choosing
105 - Your own small assembly-like language and a VM for it { Include a game with it; built with the new language }
106 - Picross solver
107 - Multiply two random 100-digit numbers and display the result
108 - Billiard game
109 - Sodoku generator/solver
110 - Columns/Coloris game
111 - Web crawler
112 - Battleships { Include Al players }
113 - Incremental economy simulator (time of exploration)
114 - Paint program
115 - Sine wave generator from pseudorandom numbers
116 - HTML web browser
117 - Flappy bird game
118 - Fast fowler transform (fast or slow with visualisation)
119 - Method ringing simulator
120 - Bellman-Ford simualtion (at least five vertices)
121 - Image convolution (and/or other effects using multiple threads (GPU/Software)
122 - Graphical analog dock
123 - Custom markup -> HTML converter
124 - Simple file explorer/manager
125 - Calculate the first 1000 digits of PI iteratively
126 - Blackjack game
127 - Flow in a network (Ford-Fulkerson algorithm)
128 - Static website generator (scriptable templates and content -> HTML + CSS)
129 - Draw a spinning 3D cube
130 - Dijkstra's algorithm (at least five nodes)
131 - Two or more programs communicating between each other using an IPC method
132 - Nintendo oil panic
133 - Calculate dot-&-cross of two vectors (exterior product)
134 - title man computer simulator
135 - Basic Lisp interpreter
136 - Project Euler in every language you know
137 - Random sentence generator
138 - Calculate an age in seconds with leap years
139 - Internet time with SNTP or NTP
140 - Reverse a string
141 - Tetris game
142 - Convert numbers to text (3 -> "three", etc)
143 - Expression evaluator (e.g. "7+5*(3's2)-(5/0.5)" = 42)
144 - Maze game generator/solver { Include random graphs/trees }
145 - Nonogram generator { Include a solver )
146 - Natural string order sorting (al, a2, a10, a20 instead of al, al 0, a2, a20)
147 - Conways game of life { Include other cellular automata }
148 - Image viewer (support more than one image format)
149 - Plot a mathematical function of your choice; let the user change the coefficients and exis ranges ( Include plot the derivative(s) }
150 - Basic TCP simulator (handshake, data sending and closing) { Include simulate retransmissions, 00B data, window scaling, etc }
151 - Radix base converter
152 - Wolfenstein 3D - style ray caster with coldet & texture mapping { Include textmapped floors and ceilings, sprites and lighting }
153 - Precedural generation of dungeons
154 - Rogue like game
155 - Search engine website
156 - Indy 4 game
157 - Car polo game
158 - 3D viewer
159 - Space invaders game
160 - Blogging software
161 - MP3 player
162 - Crossword game { Include solver and generator
163 - Image editor
164 - Console
165 - Forum software
166 - To-do-list
167 - Library book system
168 - Windows grep
169 - Twitter clone
170 - Facebook clone
171 - Pinterest clone
172 - Breakout game
173 - Pac-Man game
174 - Bomberman game
175 - Code editor
176 - Asteroids game
177 - Duck hunt game { Include other animals }
178 - MP3 tagger
179 - Wallpaper changer
180 - Karateka game
181 - Pole position game
182 - PDF tagger
183 - Wiki website
184 - Missile command game
185 - Simon game
186 - Launcher for Android
187 - Fortune teller website
188 - Image board bot
189 - Risk game
190 - MP4 tagger
191 - Quizz maker/reader
192 - Galaxian game
193 - File copy/paste utility
194 - File renamer with options
195 - Natural language query website
196 - Mouse dodger game
197 - Gif creator
198 - Two player go game
199 - Pipe dream game
200 - RTS game
201 - RTS map generator
202 - Tron game with Al
203 - Dating website
204 - Chess game with Al
205 - Task manager
206 - City management game
207 - Yahtzee game
208 - Procedural generation of a city
209 - Sims clone
210 - Worms done
211 - Building interior and architecture editor
212 - Rampert game clone
213 - File compression utility
214 - Drug city game
215 - Simulating groups of pedestrians
216 - Digger game
217 - MMORPG
218 - 3D FPS game
219 - Commando game
220 - Double Dragon game
221 - Civilisation game clone
222 - Animated sprite editor
223 - Reddit clone
224 - Stop watch
225 - Voice recorder
226 - IRC server and client
227 - Calender
228 - Skype clone

How-to Guide

Use git and optionally, an external website to push to Leam how to use git and commit early and often. Optionally use a web-site such as GitHub to push your work to. Build a portfolio. t Understand the problem Leam how to perform your own research. It's an incredibly useful skill which can be applied to anything in life. If you find the problem difficult, don't give up, break it down. Draw it out, write it out, do whatever you need to do to solve it. If the problem you are facing is too easy, do a brain storm and add addi¬tional functionality and/or combine it with other ideas to make your soft¬ware more challenging.
Implementation Take the language you are most familiar with to start your project off. However, if the problem is too easy, pick a language you have never used. Don't be afraid to write awful code and don't worry about the best implementation. Get it written up first and then refactor, dean it up and so on.
Test Write test cases up for your program. If you prefer paper then use paper, if you prefer Microsoft word, use that, but get used to thinking about how you can break your software. Find problems, bugs and fix them. Repeat it over and over again and document it. Throw it together into your portfolio. Remember, commit often. If something goes wrong, revert back.
Reimplement Now that you have something together with lots of documentation and experience; go wild! Use a different language and try to match it as much as possible to your first implementation. Add features, try new techniques, idioms. Try to refactor your code and optimise it
Don't stop learning Now you have gotten this far, don't stop trying to challenge yourself. Keep a portfolio, keep a blog and keep adding to it. It will look fantastic to potential employers.
Resources Wikipedia, Stack Overflow and Google. Seriously this is all you will ever need. If you aren't getting results, you are not doing your research properly and you need to improve this. I can not state enough how important this skill is and it isn't hard. With these three websites, you find your answers and if it doesn't exist, make a thread on Stack Overflow and by doing so you help other people out too. Remember, if you make a new topic for a new problem anywhere, write down what the solution is if somebody private messaged you. It helps people out a lot and it will encourage them to do the same!
Literature Knuth: The Art of Computer Programming Skiena: The Algorithm Design Manual Cormen et al: Introduction to Algorithms Rusell, Norvig: Artificial Inteligence: A Modem Approach Abelson, Sussman: Structure and Interpretation of Computer Programs
More challenges? If you need more challenges there are a lot of websites out there to help you with this! Below is a small list of the most popular, however please feel free to add more to this list.

www.hackerrank.com

www.programmingpraxis.com