# 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.

### B

### C

- Call a function in a shared library
- Canny edge detector
- Catmull–Clark subdivision surface
- Chat server
- Check Machin-like formulas
- Check input device is a terminal
- Church numerals
- Color of a screen pixel
- Color quantization
- Colour pinstripe/Printer
- Commatizing numbers
- Compare sorting algorithms' performance
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Convert decimal number to rational
- Currency

### D

### E

### F

- Faces from a mesh
- Factorial base numbers indexing permutations of a collection
- Find Chess960 starting position identifier
- Find largest left truncatable prime in a given base
- Find palindromic numbers in both binary and ternary bases
- First-class functions/Use numbers analogously
- First class environments
- Formal power series
- Fortunate numbers
- French Republican calendar
- Function frequency
- Functional coverage tree

### H

### I

### K

### L

### M

- MD4
- MD5/Implementation
- Machine code
- Matrix chain multiplication
- Matrix digital rain
- Mayan calendar
- Mayan numerals
- McNuggets problem
- Median filter
- Metaprogramming
- Metronome
- Miller–Rabin primality test
- Mind boggling card trick
- Minimal steps down to 1
- Minkowski question-mark function
- Modified random distribution
- Mouse position

### N

### P

- P-Adic numbers, basic
- P-Adic square roots
- Padovan n-step number sequences
- Paraffins
- Pathological floating point problems
- Pentagram
- Pentomino tiling
- Percolation/Mean cluster density
- Percolation/Site percolation
- Peripheral drift illusion
- Perlin noise
- Permutations/Derangements
- Permutations/Rank of a permutation
- Pi
- Pinstripe/Printer
- Pisano period
- Play recorded sounds
- Pragmatic directives
- Problem of Apollonius
- Pseudo-random numbers/Splitmix64

### R

- RIPEMD-160
- RSA code
- Ramanujan primes/twins
- Random sentence from book
- Rendezvous
- 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
- Runtime evaluation/In an environment

### S

- SOAP
- SQL-based authentication
- Same fringe
- Scope/Function names and labels
- Scope modifiers
- Secure temporary file
- Set consolidation
- Set right-adjacent bits
- Simple database
- Simulate input/Keyboard
- Simulate input/Mouse
- Sort an outline at every level
- Special variables
- Speech synthesis
- Spinning rod animation/Text
- Square form factorization
- Stack traces
- Strassen's algorithm
- Suffixation of decimal numbers
- Superellipse

### T

- Table creation/Postal addresses
- Terminal control/Clear the screen
- Terminal control/Coloured text
- Terminal control/Cursor movement
- Terminal control/Dimensions
- Terminal control/Inverse video
- Terminal control/Positional read
- Terminal control/Preserve screen
- Terminal control/Unicode output
- Test a function
- The sieve of Sundaram
- Tonelli-Shanks algorithm
- Total circles area

### U

### 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
- Cipolla's algorithm
- 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
- Compiler/Verifying syntax
- 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
- Coprime triplets
- Count how many vowels and consonants occur in a string
- Count the coins/0-1
- Cousin primes
- Create your own text control codes
- Cubic Special Primes
- Cullen and Woodall numbers
- Curve that touches three points
- Cyclops numbers

### D

- Dating agency
- Day of the week of Christmas and New Year
- Decimal floating point number to binary
- Diophantine linear system solving
- Discrete Fourier transform
- Distinct Palindromes within decimal numbers
- Divide a rectangle into a number of unequal triangles
- Dominoes
- Doubly-linked list/Element removal
- Draw pixel 2

### F

- Fibonacci matrix-exponentiation
- 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 squares n where n+1 is prime
- First 9 Prime Fibonacci Number
- Free polyominoes enumeration

### G

### L

### M

- Magic constant
- Make a backup file
- Maximum difference between adjacent elements of list
- Minimum multiple of m where digital sum equals m
- Minimum number of cells after, before, above and below NxN squares
- Minimum numbers of three lists
- Minimum primes
- Morpion solitaire
- Multidimensional Newton-Raphson method
- Multiline shebang
- Multiton

### N

- Names to numbers
- Native shebang
- Neighbour primes
- Next special primes
- Number triplets game
- Numbers divisible by their individual digits, but not by the product of their digits.
- Numbers in base 10 that are palindromic in bases 2, 4, and 16
- Numbers which are not the sum of distinct squares
- Numbers which binary and ternary digit sum are prime
- Numerical integration/Adaptive Simpson's method

### P

- Palindromic primes
- Palindromic primes in base 16
- Pandigital prime
- Parse EBNF
- Parse command-line arguments
- Perceptron
- Permutations with some identical elements
- Piprimes
- Polynomial derivative
- Positive decimal integers with the digit 1 occurring exactly twice
- 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
- Primes which contain only one odd digit
- Primes whose first and last number is 3
- Primes with digits in nondecreasing order
- Print itself
- Process SMIL directives in XML data
- Pseudorandom number generator image

### R

- Railway circuit
- Ramsey's theorem
- Raster bars
- 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
- 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
- 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
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Simple turtle graphics
- Sine wave
- Singly-linked list/Element removal
- 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
- Sorting algorithms/Tree sort on a linked list
- Special neighbor primes
- Special pythagorean triplet
- Spoof game
- Square root by hand
- Starting a web browser
- Steady Squares
- Sum data type
- Sum of primes in odd positions is prime
- Sum of square and cube digits of an integer are primes
- Sum of two adjacent numbers are primes
- Summation of primes

### T

### U

### W

## 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.

### 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.

### P

### R

## End of List[edit]

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