# Reports:Tasks not implemented in C

**Awareness**

If

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

## Contents

## Not implemented[edit]

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

### C

### E

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### I

### L

### M

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### R

### S

### 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 (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
- 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
- Compiler/Simple file inclusion pre processor
- Composite numbers k with no single digit factors whose factors are all substrings of k
- 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)
- Count the coins/0-1
- Create your own text control codes
- Cubic Special Primes
- Cullen and Woodall numbers
- Curve that touches three points
- Cyclops numbers

### D

- Dating agency
- Decimal floating point number to binary
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct Palindromes within decimal numbers
- Distribution of 0 Digits in factorial series
- Divide a rectangle into a number of unequal triangles
- Dominoes
- Doubly-linked list/Element removal

### E

### 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 words which contain the most consonants
- Find words which contains all the vowels
- Find words whose first and last three letters are equal
- Free polyominoes enumeration

### G

### I

### L

### M

### N

### P

- Palindromic primes
- Palindromic primes in base 16
- Pandigital prime
- Parse EBNF
- Particle fountain
- Particle swarm optimization
- Penrose tiling
- Perceptron
- Permutations with some identical elements
- Polynomial derivative
- Polynomial synthetic division
- 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 with digits in nondecreasing order
- Print itself
- Process SMIL directives in XML data
- Pseudorandom number generator image

### R

- Railway circuit
- Ramanujan primes
- Range modifications
- Raster bars
- Recursive descent parser generator
- Repunit primes
- 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
- Rosetta Code/List authors of task descriptions
- Rosetta Code/Run examples
- Rosetta Code/Tasks without examples
- Round-robin tournament schedule
- Ruth-Aaron numbers

### S

- Safe and Sophie Germain primes
- Safe mode
- Sanitize user input
- Segmentation fault protection
- Selective file copy
- Self-hosting compiler
- Separate the house number from the street name
- Sierpinski curve
- Simple turtle graphics
- Simulated annealing
- Sine wave
- Smallest enclosing circle problem
- Smallest multiple
- Smallest number k such that k+2^m is composite for all m less than k
- Smallest numbers
- Solve a Rubik's Cube
- Solve equations with substitution method
- Solve triangle solitare puzzle
- Solving coin problems
- Sort primes from list to a list
- Sort the letters of string in alphabetical order
- Special pythagorean triplet
- Square root by hand
- Starting a web browser
- Substring primes
- Suffix tree

### T

### U

### V

## Requiring Attention[edit]

### Examples[edit]

These tasks have implementations in C, 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.

### B

### H

### N

### P

### R

### Other pages[edit]

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

## Not Considered[edit]

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

### R

## End of List[edit]

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