# Reports:Tasks not implemented in 11l

**Awareness**

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**11l**is a language you like, or are interested in, please inform your fellow members of the 11l community; this page can't be emptied without your and their participation.

## Contents

## Not implemented[edit]

These are currently not implemented in 11l. Please implement some if you can. If any tasks are not possible or too complex in 11l, they should not be on this list. To mark a task as such, add **{{omit from|11l}}**, preserving the capitalization of the language, to that task. It will appear below under the "Not Considered" section.

### 2

### A

- ASCII art diagram converter
- AVL tree
- Active Directory/Connect
- Active Directory/Search for a user
- Active object
- Add a variable to a class instance at runtime
- Additive primes
- Address of a variable
- Animate a pendulum
- Animation
- Append a record to the end of a text file
- Approximate equality
- Archimedean spiral
- Arena storage pool
- Arithmetic-geometric mean/Calculate Pi
- Arithmetic/Rational
- Atomic updates

### B

- Barnsley fern
- Base64 decode data
- Bernoulli numbers
- Bioinformatics/Sequence mutation
- Biorhythms
- Bitcoin/address validation
- Bitcoin/public point to address
- Bitmap
- Bitmap/Bresenham's line algorithm
- Bitmap/Bézier curves/Cubic
- Bitmap/Bézier curves/Quadratic
- Bitmap/Flood fill
- Bitmap/Histogram
- Bitmap/Midpoint circle algorithm
- Bitmap/PPM conversion through a pipe
- Bitmap/Read a PPM file
- Bitmap/Read an image through a pipe
- Bitmap/Write a PPM file
- Bitwise IO
- Brazilian numbers
- Break OO privacy
- Brownian tree
- Bulls and cows
- Bulls and cows/Player
- Burrows–Wheeler transform

### C

- CUSIP
- Calendar
- Calendar - for "REAL" programmers
- Calkin-Wilf sequence
- Call a foreign-language function
- Call a function
- Call a function in a shared library
- Call an object method
- Canny edge detector
- Canonicalize CIDR
- Casting out nines
- Catmull–Clark subdivision surface
- Chaocipher
- 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
- Cheryl's birthday
- Chinese zodiac
- Cholesky decomposition
- Chowla numbers
- Church numerals
- Circular primes
- Cistercian numerals
- Closest-pair problem
- Closures/Value capture
- Color of a screen pixel
- Color quantization
- Color wheel
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Combinations with repetitions
- Commatizing numbers
- Compare sorting algorithms' performance
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Concurrent computing
- Conjugate transpose
- Consecutive primes with ascending or descending dfferences
- Constrained genericity
- Continued fraction/Arithmetic/Construct from rational number
- Convert decimal number to rational
- Convex hull
- Copy stdin to stdout
- Count in octal
- Cramer's rule
- Create a file on magnetic tape
- Create an HTML table
- Create an object at a given address
- Cuban primes
- Currency
- Currying
- Cut a rectangle
- Cyclotomic polynomial

### D

- DNS query
- De Bruijn sequences
- Deal cards for FreeCell
- Death Star
- Deconvolution/2D+
- Deepcopy
- Define a primitive data type
- Delegates
- Deming's Funnel
- Detect division by zero
- Determinant and permanent
- Determine if a string has all the same characters
- Determine if a string has all unique characters
- Determine if a string is collapsible
- Determine if a string is numeric
- Determine if a string is squeezable
- Determine if only one instance is running
- Dinesman's multiple-dwelling problem
- Dining philosophers
- Discordian date
- Display an outline as a nested table
- Distributed programming
- Documentation
- Doubly-linked list/Definition
- Doubly-linked list/Element definition
- Doubly-linked list/Element insertion
- Doubly-linked list/Traversal
- Dragon curve
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a rotating cube
- Draw a sphere
- Dutch national flag problem
- Dynamic variable names

### E

- EKG sequence convergence
- Eban numbers
- Echo server
- Egyptian division
- Egyptian fractions
- Element-wise operations
- Elementary cellular automaton
- Elementary cellular automaton/Infinite length
- Elementary cellular automaton/Random Number Generator
- Elliptic Curve Digital Signature Algorithm
- Elliptic curve arithmetic
- Emirp primes
- Entropy/Narcissist
- Esthetic numbers
- Events
- Evolutionary algorithm
- Executable library
- Execute HQ9+
- Execute a Markov algorithm
- Exponentiation operator
- Exponentiation with infix operators in (or operating on) the base
- Extend your language
- Extensible prime generator
- Extreme floating point values

### F

- FASTA format
- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Factorions
- Factors of a Mersenne number
- Fairshare between two and more
- Faulhaber's formula
- Faulhaber's triangle
- Fermat numbers
- Fibonacci word/fractal
- File modification time
- File size
- File size distribution
- Find Chess960 starting position identifier
- Find duplicate files
- Find if a point is within a triangle
- Find largest left truncatable prime in a given base
- Find limit of recursion
- Find the intersection of two lines
- First-class functions
- First-class functions/Use numbers analogously
- First class environments
- First perfect square in base n with n unique digits
- First power of 2 that has leading decimal digits of 12
- Five weekends
- Fixed length records
- Flatten a list
- Flipping bits game
- Forest fire
- Fork
- Formal power series
- Fortunate numbers
- Four is magic
- Four is the number of letters in the ...
- Fractal tree
- French Republican calendar
- Function frequency
- Function prototype
- Functional coverage tree

### G

- GUI/Maximum window dimensions
- GUI component interaction
- GUI enabling/disabling of controls
- Galton box animation
- Gapful numbers
- Gauss-Jordan matrix inversion
- Generate random chess position
- Get system command output
- Go Fish
- Graph colouring
- Gray code
- Grayscale image
- Greyscale bars/Display
- Guess the number/With feedback
- Guess the number/With feedback (player)

### H

- HTTP
- HTTPS
- HTTPS/Authenticated
- HTTPS/Client-authenticated
- Halt and catch fire
- Handle a signal
- Hello world/Graphical
- Hello world/Line printer
- Hello world/Web server
- Hickerson series of almost integers
- Hilbert curve
- History variables
- Holidays related to Easter
- Honeycombs
- Host introspection
- Hostname
- Hough transform
- Hunt the Wumpus

### I

- Idiomatically determine all the characters that can be used for symbols
- Image convolution
- Image noise
- Imaginary base numbers
- Include a file
- Increasing gaps between consecutive Niven numbers
- Index finite lists of positive integers
- Inheritance/Multiple
- Input loop
- Integer overflow
- Interactive programming
- Introspection
- Inverted syntax
- Isqrt (integer square root) of X

### K

### L

- Largest proper divisor of n
- Last Friday of each month
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
- Legendre prime counting function
- Levenshtein distance/Alignment
- Long literals, with continuations
- Longest string challenge
- Loops/With multiple ranges
- Loops/Wrong ranges
- Lucky and even lucky numbers

### M

- MAC Vendor Lookup
- MD4
- MD5
- MD5/Implementation
- Machine code
- Magic 8-ball
- Magnanimous numbers
- Main step of GOST 28147-89
- Man or boy test
- Mastermind
- Matrix-exponentiation operator
- Matrix chain multiplication
- Matrix digital rain
- Matrix multiplication
- Mayan calendar
- Mayan numerals
- Median filter
- Memory allocation
- Memory layout of a data structure
- Mertens function
- Metallic ratios
- Metaprogramming
- Metered concurrency
- Miller–Rabin primality test
- Minesweeper game
- Minimal steps down to 1
- Minimum positive multiple in base 10 using only 0 and 1
- Minkowski question-mark function
- Modified random distribution
- Modular arithmetic
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Morse code
- Motzkin numbers
- Mouse position
- Multi-dimensional array
- Multiple regression
- Multiplicative order
- Munching squares
- Musical scale
- Mutex
- Mutual recursion
- Möbius function

### N

### O

### P

- P-Adic numbers, basic
- P-Adic square roots
- P-value correction
- Padovan n-step number sequences
- Padovan sequence
- Palindromic gapful numbers
- Pancake numbers
- Paraffins
- Parallel brute force
- Parallel calculations
- Parametric polymorphism
- Parametrized SQL statement
- Parse an IP Address
- Partial function application
- Password generator
- Pathological floating point problems
- Pattern matching
- Peano curve
- Penney's game
- Pentagram
- Percentage difference between images
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Permutations/Rank of a permutation
- Pierpont primes
- Pig the dice game
- Pig the dice game/Player
- Pinstripe/Display
- Pinstripe/Printer
- Pisano period
- Plasma effect
- Play recorded sounds
- Playing cards
- Plot coordinate pairs
- Pointers and references
- Polymorphic copy
- Polymorphism
- Polyspiral
- Pragmatic directives
- Probabilistic choice
- Pythagoras tree

### R

- RCRPG
- RIPEMD-160
- RPG attributes generator
- Ramanujan's constant
- Ramanujan primes/twins
- Random number generator (device)
- Random number generator (included)
- Random numbers
- Random sentence from book
- Rare numbers
- Rate counter
- Read a file character by character/UTF8
- Read a file line by line
- Record sound
- Reflection/Get source
- Reflection/List methods
- Reflection/List properties
- Rendezvous
- Respond to an unknown method call
- Retrieve and search chat history
- Rock-paper-scissors
- Rosetta Code/Count examples
- Rosetta Code/Find bare lang tags
- Rosetta Code/Find unimplemented tasks
- Rosetta Code/Rank languages by number of users
- Rosetta Code/Rank languages by popularity
- Runtime evaluation
- Runtime evaluation/In an environment

### S

- S-expressions
- SHA-1
- SHA-256
- SHA-256 Merkle tree
- SOAP
- SQL-based authentication
- Safe addition
- Safe primes and unsafe primes
- Same fringe
- Scope/Function names and labels
- Secure temporary file
- Self numbers
- Send an unknown method call
- Send email
- Sequence: nth number with exactly n divisors
- Sequence of primorial primes
- Set consolidation
- Set of real numbers
- Set puzzle
- Shell one-liner
- Show the epoch
- Sierpinski arrowhead curve
- Sierpinski pentagon
- Sierpinski square curve
- Sierpinski triangle/Graphical
- Simple database
- Simple windowed application
- Simulate input/Keyboard
- Simulate input/Mouse
- Singleton
- Singly-linked list/Element definition
- Singly-linked list/Element insertion
- Singly-linked list/Traversal
- Sleeping Beauty problem
- Sockets
- Sort an outline at every level
- Sorting algorithms/Sleep sort
- Sparkline in unicode
- Special variables
- Speech synthesis
- Spelling of ordinal numbers
- Square form factorization
- Stack traces
- Start from a main routine
- Statistics/Normal distribution
- Strassen's algorithm
- Stream merge
- String length
- Sum and product puzzle
- Summarize primes
- Superellipse
- Sylvester's sequence
- Synchronous concurrency

### T

- Table creation/Postal addresses
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Cursor positioning
- Terminal control/Dimensions
- Terminal control/Hiding the cursor
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Ternary logic
- Test a function
- The ISAAC Cipher
- The sieve of Sundaram
- Topic variable
- Tree datastructures
- Tree from nesting levels
- Twelve statements
- Twin primes

### U

### W

### Draft tasks without implementation[edit]

These tasks are drafts, meaning they largely need more work to turn them into full tasks. Perhaps you can help by trying to implement them in 11l (after all, one of the key requirements for a task being non-draft is multiple implementations, preferably in widely different languages) but be aware that this may be difficult because of lack of definition of the task itself.

### A

### B

### C

- CLI-based maze-game
- Card shuffles
- Change e letters to i in words
- Changeable words
- Chebyshev coefficients
- Checksumcolor
- Chemical calculator
- Chess player
- Cipolla's algorithm
- Code segment unload
- Combinations with repetitions/Square digit chain
- Common list elements
- Common sorted list
- Compiler/Simple file inclusion pre processor
- Compiler/Verifying syntax
- Concatenate two primes is also prime
- Conjugate a Latin Verb
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
- Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
- Coprime triplets
- Coprimes
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Cousin primes
- Create an object/Native demonstration
- Cubic Special Primes
- Curve that touches three points
- Cyclops numbers

### D

- Data Encryption Standard
- Days between dates
- Decimal floating point number to binary
- Decision tables
- Discrete Fourier transform
- Distinct Palindromes within decimal numbers
- Distinct power numbers
- Distribution of 0 Digits in factorial series
- Doomsday rule
- Doubly-linked list/Element removal
- Draw pixel 2

### F

- Fibonacci heap
- Fibonacci matrix-exponentiation
- Find URI in text
- Find first missing positive
- Find minimum number of coins that make a given value
- Find prime n such that reversed n is also prime
- Find prime numbers of the form n*n*n+2
- Find words which contain the most consonants
- Find words which contains all the vowels
- Find words which contains more than 3 e vowels
- Find words whose first and last three letters are equal
- Find words with alternating vowels and consonants
- Finite state machine
- Free polyominoes enumeration
- Frobenius numbers

### G

### I

### L

### M

### N

- N-body problem
- Names to numbers
- Native shebang
- Neighbour primes
- Next special primes
- Nice primes
- Number triplets game
- Numbers divisible by their individual digits, but not by the product of their digits.
- Numbers in base-16 representation that cannot be written with decimal digits
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers which binary and ternary digit sum are prime
- Numbers whose count of divisors is prime
- Numbers with prime digits whose sum is 13
- Numbers with same digit set in base 10 and base 16
- Numerical integration/Adaptive Simpson's method

### O

### P

- Palindromic primes
- Palindromic primes in base 16
- Pandigital prime
- Parse EBNF
- Parse command-line arguments
- Particle fountain
- Particle swarm optimization
- Penrose tiling
- Pentomino tiling
- Perceptron
- Peripheral drift illusion
- Permutations with some identical elements
- Permuted multiples
- Piprimes
- Positive decimal integers with the digit 1 occurring exactly twice
- Powerful numbers
- Practical numbers
- Price list behind API
- Prime numbers p which sum of prime numbers less or equal to p is prime
- Prime numbers which contain 123
- Prime triplets
- Prime words
- Primes which contain only one odd digit
- Primes which sum of digits is 25
- Primes whose first and last number is 3
- Primes with digits in nondecreasing order
- Print debugging statement
- Process SMIL directives in XML data
- Proof
- Pseudorandom number generator image

### R

- Railway circuit
- Ramanujan primes
- Raster bars
- Recursive descent parser generator
- Remote agent/Agent interface
- Remote agent/Agent logic
- Remote agent/Simulation
- Reverse the order of lines in a text file while preserving the contents of each line
- Robots
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Run as a daemon or service

### S

- Safe mode
- Selective file copy
- Self-hosting compiler
- Separate the house number from the street name
- Shift list elements to left by 3
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Sierpinski curve
- Simple turtle graphics
- Simulated annealing
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Smallest power of 6 whose decimal expansion contains n
- Smallest square that begins with n
- Snake
- Snake and Ladder
- Solve a Rubik's Cube
- Solving coin problems
- Sort the letters of string in alphabetical order
- Sorting algorithms/Tree sort on a linked list
- Special Divisors
- Special factorials
- Special neighbor primes
- Special pythagorean triplet
- Spoof game
- Square root by hand
- Starting a web browser
- Substring primes
- Sum data type
- Sum of elements below main diagonal of matrix
- Sum of first n cubes
- Sum of primes in odd positions is prime
- Sum of the digits of n is substring of n

### 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
- Three word location
- Time-based one-time password algorithm
- Transportation problem
- Triplet of three numbers
- Tropical algebra overloading
- Type detection

### U

### W

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in 11l, but somebody, somewhere, decided that the example implementation was faulty or in some other way requiring attention. If you're familiar with the task and language, please consider reviewing/correcting the example and removing the notice.

### No pages found.

### Other pages[edit]

These are other pages related to 11l which require attention; with your knowledge and assistance, we can improve the quality of the site's content.

### No pages found.

## Not Considered[edit]

These tasks are not generally counted toward "unimplemented", as somebody, somewhere, decided that 11l was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.

### No pages found.

## End of List[edit]

Again, feel free to try your hand at any of the tasks listed on this page.