Tasks not implemented in ALGOL 68
Awareness
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If ALGOL 68 is a language you like, or are interested in, please inform your fellow members of the ALGOL 68 community; this page can't be emptied without your and their participation.
Tasks not implemented in ALGOL 68
1
2
9
A
- ADFGVX cipher
- ASCII art diagram converter
- AVL tree
- Abbreviations, automatic
- Active Directory/Connect
- Active Directory/Search for a user
- Active object
- Algebraic data types
- Anagram generator
- Animate a pendulum
- Animated Spinners
- Animation
- Append a record to the end of a text file
- Arena storage pool
- Atomic updates
- Autogram checker
- Average loop length
B
- Babylonian spiral
- Base64 decode data
- Bifid cipher
- Bioinformatics/Global alignment
- Bioinformatics/Sequence mutation
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap/Bézier curves/Quadratic
- Bitmap/Flood fill
- Bitmap/Histogram
- Bitmap/PPM conversion through a pipe
- Bitmap/Read a PPM file
- Bitmap/Read an image through a pipe
- Bitmap/Write a PPM file
- Boyer-Moore string search
- Brace expansion
- Brazilian numbers
- Break OO privacy
- Brownian tree
- Burrows–Wheeler transform
- Bézier curves/Intersections
C
- Call a function in a shared library
- Canny edge detector
- Catmull–Clark subdivision surface
- Chaos game
- Chat server
- Check Machin-like formulas
- Check input device is a terminal
- Check output device is a terminal
- Checkpoint synchronization
- Chernick's Carmichael numbers
- Church numerals
- Closest-pair problem
- Color of a screen pixel
- Color quantization
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations with repetitions
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Convert decimal number to rational
- Convex hull
- Create a file on magnetic tape
- Create an object at a given address
- Cut a rectangle
- Cycles of a permutation
- Cyclotomic polynomial
D
- DNS query
- Date manipulation
- Dating agency
- De Bruijn sequences
- Deal cards for FreeCell
- Deconvolution/1D
- Deconvolution/2D+
- Deepcopy
- Deming's funnel
- Determine if only one instance is running
- Dice game probabilities
- Dining philosophers
- Display an outline as a nested table
- Distance and Bearing
- Distributed programming
- Distribution of 0 digits in factorial series
- Documentation
- Dominoes
- Draw a clock
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
E
- EKG sequence convergence
- Echo server
- Eertree
- Elementary cellular automaton/Infinite length
- Elliptic Curve Digital Signature Algorithm
- Elliptic curve arithmetic
- Erdös-Selfridge categorization of primes
- Euler's constant 0.5772...
- Events
- Executable library
- Execute a Markov algorithm
- Extensible prime generator
- Extreme floating point values
F
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Faulhaber's formula
- Fibonacci word/fractal
- File size distribution
- Find Chess960 starting position identifier
- Find duplicate files
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- Find the intersection of a line with a plane
- First class environments
- Fixed length records
- Flipping bits game
- Formal power series
- Four bit adder
- Four is the number of letters in the ...
- Fractal tree
- Fraction reduction
- French Republican calendar
- Function frequency
- Functional coverage tree
G
- GUI component interaction
- GUI enabling/disabling of controls
- GUI/Maximum window dimensions
- Galton box animation
- Generate Chess960 starting position
- Generate random chess position
- Get system command output
- Globally replace text in several files
- Go Fish
- Gotchas
- Graph colouring
- Grayscale image
- Greyscale bars/Display
H
- HTTPS
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Handle a signal
- Hash from two arrays
- Hash join
- Hello world/Web server
- Hex dump
- History variables
- Hofstadter Figure-Figure sequences
- Home primes
- Honeycombs
- Hough transform
- Huffman coding
- Hunt the Wumpus
I
- I'm a software engineer, get me out of here
- IBAN
- Image convolution
- Image noise
- Imaginary base numbers
- Index finite lists of positive integers
- Inheritance/Multiple
- Inverted index
J
K
- K-d tree
- K-means++ clustering
- Keyboard input/Flush the keyboard buffer
- Keyboard input/Keypress check
- Keyboard input/Obtain a Y or N response
- Keyboard macros
- Knapsack problem/0-1
- Knapsack problem/Bounded
- Knapsack problem/Continuous
- Knuth's algorithm S
- Knuth's power tree
- Kolakoski sequence
- Kosaraju
L
- LU decomposition
- LZW compression
- Last letter-first letter
- Latin Squares in reduced form
- Legendre prime counting function
- Levenshtein distance/Alignment
- List rooted trees
- Logistic curve fitting in epidemiology
- Long literals, with continuations
- Longest increasing subsequence
- Lucky and even lucky numbers
- Lyndon word
M
- MAC vendor lookup
- MD4
- MD5/Implementation
- Machine code
- Main step of GOST 28147-89
- Make directory path
- Mastermind
- Matrix chain multiplication
- Matrix digital rain
- Mayan calendar
- Mayan numerals
- Maze generation
- Maze solving
- Median filter
- Merge and aggregate datasets
- Metallic ratios
- Metronome
- Mind boggling card trick
- Minesweeper game
- Minimal steps down to 1
- Minkowski question-mark function
- Monads/List monad
- Morse code
- Mouse position
- Multi-base primes
- Munching squares
- Musical scale
- Mutex
N
- N-smooth numbers
- Natural sorting
- Nautical bell
- Nested templated data
- Nonoblock
- Nonogram solver
- Numerical and alphabetical suffixes
- Numerical integration/Gauss-Legendre Quadrature
O
- OLE automation
- One-time pad
- OpenGL
- OpenWebNet password
- Order by pair comparisons
- Order disjoint list items
- Ordered partitions
- Ormiston triples
P
- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Palindromic gapful numbers
- Pancake numbers
- Paraffins
- Parallel brute force
- Parallel calculations
- Parameterized SQL statement
- Parametric polymorphism
- Parse an IP Address
- Particle fountain
- Partition function P
- Password generator
- Peaceful chess queen armies
- Penney's game
- Pentagram
- Pentomino tiling
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Site percolation
- Peripheral drift illusion
- Permutation test
- Permutations/Derangements
- Permutations/Rank of a permutation
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Plasma effect
- Play recorded sounds
- Playfair cipher
- Poker hand analyser
- Polyspiral
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Priority queue
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pythagoras tree
Q
R
- RCRPG
- RIPEMD-160
- Ramanujan primes/twins
- Ramanujan's constant
- Random number generator (device)
- Rate counter
- Read a configuration file
- Read a file character by character/UTF8
- Recaman's sequence
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Rendezvous
- Resistor mesh
- Respond to an unknown method call
- Retrieve and search chat history
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Find unimplemented tasks
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users
S
- SHA-1
- SHA-256
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Sailors, coconuts and a monkey problem
- Same fringe
- Sealed classes and methods
- Search in paragraph's text
- Secure temporary file
- Send an unknown method call
- Send email
- Set consolidation
- Set of real numbers
- Set puzzle
- Set right-adjacent bits
- Set, the card game
- Sexy primes
- Show the epoch
- Sierpinski pentagon
- Sieve of Pritchard
- Simple database
- Simple turtle graphics
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Singleton
- Singular value decomposition
- Smarandache-Wellin primes
- Snake
- Sockets
- Sokoban
- Solve a Hidato puzzle
- Solve a Hopido puzzle
- Solve a Numbrix puzzle
- Solve the no connection puzzle
- Sorensen–Dice coefficient
- Sort a list of object identifiers
- Sort an outline at every level
- Sort stability
- Sorting algorithms/Bead sort
- Sorting algorithms/Patience sort
- Sorting algorithms/Permutation sort
- Sorting algorithms/Sleep sort
- Sorting algorithms/Strand sort
- Sparkline in unicode
- Speech synthesis
- Stable marriage problem
- Stack traces
- State name puzzle
- Statistics/Normal distribution
- Strassen's algorithm
- Strip block comments
- Subtractive generator
- Suffixation of decimal numbers
- Summarize and say sequence
- Super-Poulet numbers
- Super-d numbers
- Superellipse
- Superpermutation minimisation
- Sutherland-Hodgman polygon clipping
- Sync subtitles
T
- Take notes on the command line
- Tarjan
- Taxicab numbers
- Teacup rim text
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- Terminal control/Display an extended character
- Terminal control/Hiding the cursor
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Ringing the terminal bell
- Terminal control/Unicode output
- Test a function
- Text processing/2
- Tic-tac-toe
- Time a function
- Tonelli-Shanks algorithm
- Topic variable
- Topological sort
- Topswops
- Transliterate English text using the Greek alphabet
- Tree datastructures
- Tree from nesting levels
- Truncate a file
- Twelve statements
- Two bullet roulette
U
- UTF-8 encode and decode
- Ukkonen’s suffix tree construction
- Unbias a random generator
- Universal Lambda Machine
- Universal Turing machine
- Unix/ls
- Update a configuration file
- Use another language to call a function
- User input/Graphical
V
- Validate International Securities Identification Number
- Vampire number
- Variable size/Set
- Variable-length quantity
- Variadic fixed-point combinator
- Verhoeff algorithm
- Verify distribution uniformity/Chi-squared test
- Verify distribution uniformity/Naive
- Video display modes
- Vigenère cipher/Cryptanalysis
- Vogel's approximation method
- Voronoi diagram
W
- War card game
- Wasteful, equidigital and frugal numbers
- Water collected between towers
- Window management
- Word search
- Word wheel
- Word wrap
- Wordiff
- World Cup group stage
- Write language name in 3D ASCII
- Write to Windows event log
X
Y
Z
Draft tasks not implemented in ALGOL 68
1
3
A
- A* search algorithm
- Addition chains
- Addition-chain exponentiation
- Air mass
- Arithmetic coding/As a generalized change of radix
- Aspect oriented programming
- Assertions in design by contract
- Audio alarm
- Audio frequency generator
- Audio overlap loop
B
- Banker's algorithm
- Base58Check encoding
- Bilinear interpolation
- Bioinformatics/Subsequence
- Black box
- Blackjack strategy
- Boids
- Brace expansion using ranges
- Brzozowski algebraic method
C
- CLI-based maze-game
- Card shuffles
- Carmichael lambda function
- Checksumcolor
- Chess player
- Cipolla's algorithm
- Code segment unload
- Color separation
- Combinations with repetitions/Square digit chain
- Common sorted list
- Compiler/Preprocessor
- Compiler/Verifying syntax
- Consistent overhead byte stuffing
- Continued fraction convergents
- Countdown
- Create an object/Native demonstration
- Create your own text control codes
- Cross compilation
- Cycle detection
D
- Data Encryption Standard
- Decimal floating point number to binary
- Decision tables
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct palindromes within decimal numbers
- Divide a rectangle into a number of unequal triangles
- Doubly-linked list/Element removal
- Draw pixel 2
E
- Eisenstein primes
- Elevator simulation
- Engel expansion
- English cardinal anagrams
- Erdős–Woods numbers
- Execute CopyPasta Language
- Exponential digital sums
- Extended Straddling Checkerboard
- External sort
F
- Factor-perfect numbers
- Fibonacci heap
- Fibonacci matrix-exponentiation
- Find URI in text
- Free polyominoes enumeration
G
H
I
J
K
L
- Lagrange Interpolation
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews' technique
- Launch rocket with countdown and acceleration in stdout
- Line circle intersection
- Linux CPU utilization
- Long stairs
- Longest substrings without repeating characters
- Lucas-Carmichael numbers
M
- Make a backup file
- Marching squares
- Markov chain text generator
- McNaughton-Yamada-Thompson algorithm
- Modulinos
- Montgomery reduction
- Morpion solitaire
- Most frequent k chars distance
- Multidimensional Newton-Raphson method
- Multiline shebang
- Multiton
N
- N-queens minimum and knights and bishops
- NYSIIS
- Names to numbers
- Next special primes
- Nimber arithmetic
- Number triplets game
O
P
- Parse command-line arguments
- Particle swarm optimization
- Penholodigital squares
- Penrose tiling
- Perceptron
- Permutations with some identical elements
- Permuted multiples
- Polynomial synthetic division
- Posit numbers/decoding
- Posit numbers/encoding
- Powerful numbers
- Price list behind API
- Print debugging statement
- Process SMIL directives in XML data
- Protecting Memory Secrets
- Pseudorandom number generator image
R
- Railway circuit
- Rainbow
- Ramsey's theorem
- Range modifications
- Raster bars
- Readline interface
- Recursive descent parser generator
- Red black tree sort
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Resistance calculator
- Resistance network calculator
- Reverse the gender of a string
- Reverse the order of lines in a text file while preserving the contents of each line
- Robots
- Roots of a cubic polynomial
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service
S
- Sanitize user input
- Segmentation fault protection
- Selection bias in clinical sciences
- Sierpinski curve
- Simulated annealing
- Simulated optics experiment/Data analysis
- Simulated optics experiment/Simulator
- Sine wave
- Smallest enclosing circle problem
- Solve a Rubik's cube
- Solving coin problems
- Sorting algorithms/Tree sort on a linked list
- Spoof game
- Square root by hand
- Starting a web browser
- Statistics/Chi-squared distribution
- Subset sum problem
- Suffix tree
- Sunflower fractal
- Szymański's algorithm
T
- Table creation
- Tamagotchi emulator
- Terminal control/Restricted width positional input/No wrapping
- Terminal control/Restricted width positional input/With wrapping
- Tetris
- Text completion
- Text to HTML
- The ISAAC cipher
- Three word location
- Time conventions and conversions
- Time-based one-time password algorithm
- Topological sort/Extracted top item
- Transportation problem
- Type detection
U
- URL shortener
- Unicode polynomial equation
- Unit testing
- Uno (card game)
- Untrusted environment
- Use a REST API
- Using a speech engine to highlight words
V
W
- Wave function collapse
- Waveform analysis/Doh ray me
- Waveform analysis/Top and tail
- Weather routing
- WebGL rotating F
- Welch's t-test
- WiktionaryDumps to words
X
Tasks omitted from ALGOL 68
A
C
D
I
P
End of List
Again, feel free to try your hand at any of the tasks listed on this page.