# Reports:Tasks not implemented in C sharp

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### A

### B

### C

- Calkin-Wilf sequence
- Call a foreign-language function
- Canny edge detector
- Carmichael 3 strong pseudoprimes
- Catmull–Clark subdivision surface
- Check Machin-like formulas
- Check input device is a terminal
- Chernick's Carmichael numbers
- Circular primes
- Cistercian numerals
- Color quantization
- Color wheel
- Colorful numbers
- Colour bars/Display
- Colour pinstripe/Display
- Colour pinstripe/Printer
- Combinations and permutations
- Compare sorting algorithms' performance
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Composite numbers k with no single digit factors whose factors are all substrings of k
- Conjugate transpose
- Create an object at a given address
- Cullen and Woodall numbers
- Curzon numbers
- Cut a rectangle
- Cyclops numbers

### D

### E

- EKG sequence convergence
- Earliest difference between prime gaps
- Elementary cellular automaton/Infinite length
- Elementary cellular automaton/Random number generator
- Elliptic Curve Digital Signature Algorithm
- Elliptic curve arithmetic
- Entropy/Narcissist
- Equal prime and composite sums
- Erdös-Selfridge categorization of primes
- Esthetic numbers
- Euler's constant 0.5772...
- Executable library
- Execute Computer/Zero
- Execute SNUSP
- Execute a Markov algorithm
- Exponentiation with infix operators in (or operating on) the base
- Extensible prime generator
- Extreme floating point values

### F

- FTP
- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Factorions
- Fairshare between two and more
- Fermat numbers
- Fibonacci word/fractal
- File extension is in extensions list
- File size distribution
- Find Chess960 starting position identifier
- Find duplicate files
- Find if a point is within a triangle
- First class environments
- Fixed length records
- Flipping bits game
- Formal power series
- Fortunate numbers
- Four is magic
- Four is the number of letters in the ...
- Fractal tree
- Fractran
- French Republican calendar
- Function frequency
- Functional coverage tree

### G

### I

### K

### L

- LU decomposition
- Largest proper divisor of n
- Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
- Legendre prime counting function
- Levenshtein distance/Alignment
- List rooted trees
- Long literals, with continuations
- Longest string challenge
- Lucky and even lucky numbers
- Lychrel numbers

### M

- Machine code
- Magic constant
- Magic squares of odd order
- Magic squares of singly even order
- Main step of GOST 28147-89
- Mastermind
- Matrix digital rain
- Mayan calendar
- Mayan numerals
- Maze solving
- Median filter
- Memory layout of a data structure
- Mertens function
- Metronome
- Mind boggling card trick
- Minimum multiple of m where digital sum equals m
- Minkowski question-mark function
- Modified random distribution
- Monads/List monad
- Monads/Writer monad
- Multi-base primes
- Musical scale
- Mutex
- Möbius function

### N

### O

### P

- P-Adic numbers, basic
- P-Adic square roots
- Padovan n-step number sequences
- Padovan sequence
- Palindromic gapful numbers
- Pancake numbers
- Paraffins
- Parse an IP Address
- Particle fountain
- Peano curve
- Pell numbers
- Pentagram
- Percolation/Bond percolation
- Percolation/Mean cluster density
- Percolation/Mean run density
- Percolation/Site percolation
- Perfect totient numbers
- Periodic table
- Peripheral drift illusion
- Perlin noise
- Permutations/Rank of a permutation
- Permutations by swapping
- Pig the dice game/Player
- Pinstripe/Printer
- Pisano period
- Plasma effect
- Playfair cipher
- Plot coordinate pairs
- Pragmatic directives
- Prime triangle
- Primes - allocate descendants to their ancestors
- Primorial numbers
- Pseudo-random numbers/Combined recursive generator MRG32k3a
- Pseudo-random numbers/Middle-square method
- Pseudo-random numbers/PCG32
- Pseudo-random numbers/Splitmix64
- Pseudo-random numbers/Xorshift star
- Pythagoras tree

### R

- RCRPG
- Ramanujan's constant
- Ramanujan primes/twins
- Random sentence from book
- Rate counter
- Ray-casting algorithm
- Read a configuration file
- Record sound
- Reflection/Get source
- Rendezvous
- Rep-string
- Repunit primes
- Retrieve and search chat history
- Rhonda numbers
- Rosetta Code/Find bare lang tags
- Rosetta Code/Fix code tags
- Rosetta Code/Rank languages by number of users
- Runtime evaluation
- Runtime evaluation/In an environment
- Ruth-Aaron numbers

### S

- SHA-256 Merkle tree
- SOAP
- Scope/Function names and labels
- Search in paragraph's text
- Selectively replace multiple instances of a character within a string
- Self-describing numbers
- Sequence: nth number with exactly n divisors
- Sequence: smallest number greater than previous term with exactly n divisors
- Sequence: smallest number with exactly n divisors
- Sequence of primorial primes
- Set right-adjacent bits
- Sexy primes
- Sierpinski arrowhead curve
- Sierpinski pentagon
- Sierpinski square curve
- Sierpinski triangle/Graphical
- Simple turtle graphics
- Simulate input/Keyboard
- Simulate input/Mouse
- Sleeping Beauty problem
- Smallest number k such that k+2^m is composite for all m less than k
- Smarandache prime-digital sequence
- Snake
- Solve the no connection puzzle
- Sort an outline at every level
- Sorting algorithms/Bead sort
- Sorting algorithms/Cocktail sort with shifting bounds
- Sorting algorithms/Patience sort
- Sorting algorithms/Strand sort
- Sparkline in unicode
- Special characters
- Special variables
- Spelling of ordinal numbers
- Spinning rod animation/Text
- Square-free integers
- Square form factorization
- State name puzzle
- Stirling numbers of the first kind
- Stirling numbers of the second kind
- Strassen's algorithm
- String comparison
- Suffixation of decimal numbers
- Sum of elements below main diagonal of matrix
- Summarize and say sequence
- Summarize primes
- Superellipse
- Superpermutation minimisation
- Sylvester's sequence

### T

- Table creation/Postal addresses
- Tau function
- Tau number
- Teacup rim text
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Text processing/1
- Textonyms
- Thiele's interpolation formula
- Topic variable
- Topswops
- Total circles area
- Trabb Pardo–Knuth algorithm
- Tree datastructures
- Tree from nesting levels
- Two's complement
- Two bullet roulette

### U

### V

### 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 C sharp (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
- Camel case and snake case
- Change e letters to i in words
- Changeable words
- Checksumcolor
- Chess player
- Code Golf: Code Golf
- Code segment unload
- Collect and sort square numbers in ascending order from three lists
- Combinations with repetitions/Square digit chain
- Common list elements
- Common sorted list
- Compiler/Preprocessor
- 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 executable for a program in an interpreted language
- Create an object/Native demonstration
- Create your own text control codes
- Cross compilation
- Cubic special primes
- Curve that touches three points
- Cycles of a permutation

### D

- Dating agency
- Day of the week of Christmas and New Year
- Decimal floating point number to binary
- Decision tables
- Digit fifth powers
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct palindromes within decimal numbers
- Distinct power numbers
- Distribution of 0 digits in factorial series
- Divide a rectangle into a number of unequal triangles
- Doomsday rule
- Doubly-linked list/Element removal
- Draw pixel 2

### E

### F

- Factorial primes
- Fibonacci heap
- Find URI in text
- Find adjacent primes which differ by a square integer
- Find first and last set bit of a long integer
- 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 square difference
- Find squares n where n+1 is prime
- 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
- First 9 prime Fibonacci number
- Four sides of square

### G

### I

### L

- Largest difference between adjacent primes
- Largest five adjacent number
- Largest prime factor
- Largest product in a grid
- Last list item
- Launch rocket with countdown and acceleration in stdout
- Length of an arc between two angles
- Logistic curve fitting in epidemiology
- Long stairs
- Longest common suffix
- Longest palindromic substrings
- Longest substrings without repeating characters

### M

- Make a backup file
- Marching squares
- Matrix with two diagonals
- Maximum difference between adjacent elements of list
- Minimum number of cells after, before, above and below NxN squares
- Minimum numbers of three lists
- Modulinos
- Morpion solitaire
- Mosaic matrix
- Most frequent k chars distance
- Multiline shebang
- Multiton

### N

- N-queens minimum and knights and bishops
- NYSIIS
- Names to numbers
- Native shebang
- Next special primes
- Nice primes
- Nimber arithmetic
- 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 same digit set in base 10 and base 16
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method

### O

### P

- Palindromic primes
- Palindromic primes in base 16
- Pan base non-primes
- Parse EBNF
- Parse command-line arguments
- Penrose tiling
- Perceptron
- Permutations with repetitions
- Permutations with some identical elements
- Permuted multiples
- Piprimes
- Polynomial derivative
- Positive decimal integers with the digit 1 occurring exactly twice
- Powerful numbers
- Price list behind API
- Prime numbers p for which the sum of primes less than or equal to p is prime
- Prime numbers which contain 123
- Prime triplets
- Prime words
- Primes whose first and last number is 3
- Primes whose sum of digits is 25
- Primorial primes
- Print debugging statement
- Print itself
- Process SMIL directives in XML data
- Product of divisors
- Proof
- Pseudorandom number generator image

### R

- Railway circuit
- Ramanujan primes
- Ramsey's theorem
- Range modifications
- Raster bars
- 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
- Rodrigues’ rotation formula
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Round-robin tournament schedule
- Run as a daemon or service

### S

- Safe and Sophie Germain primes
- Safe mode
- Sanitize user input
- Segmentation fault protection
- Selective file copy
- Separate the house number from the street name
- Shift list elements to left by 3
- Sierpinski curve
- Simulated annealing
- Sine wave
- Smallest enclosing circle problem
- Smallest multiple
- Smallest numbers
- Smallest power of 6 whose decimal expansion contains n
- Solve a Rubik's cube
- Solve equations with substitution method
- Solve hanging lantern problem
- Solve triangle solitare puzzle
- Solving coin problems
- Sort primes from list to a list
- Sorting algorithms/Cycle sort
- Sorting algorithms/Tree sort on a linked list
- Special factorials
- Special neighbor primes
- Special pythagorean triplet
- Spoof game
- Starting a web browser
- Steady squares
- Strange numbers
- Strange plus numbers
- Substring primes
- Sum data type
- Sum of divisors
- Sum of primes in odd positions is prime
- Sum of square and cube digits of an integer are primes
- Sum of the digits of n is substring of n
- Sum of two adjacent numbers are primes
- Summation of primes
- Sunflower fractal

### 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
- Topological sort/Extracted top item
- Transliterate English text using the Greek alphabet
- Tropical algebra overloading

### U

### W

- Wasteful, equidigital and frugal numbers
- 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
- Word break problem
- Wordle comparison
- Words containing "the" substring
- Words from neighbour ones
- Worthwhile task shaving

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in C sharp, 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 C sharp 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 C sharp was inappropriate for these tasks, or implementations of them would be unenlightening. Feel free to try your hand at them anyway.

### C

### I

### J

### S

## End of List[edit]

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