# 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

- Calendar - for "REAL" programmers
- 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 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
- 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 numerals
- McNuggets problem
- Median filter
- Metaprogramming
- Metered concurrency
- Metronome
- Miller–Rabin primality test
- Mind boggling card trick
- Minimal steps down to 1
- Minkowski question-mark function
- Modified random distribution
- Monads/List monad
- Monads/Maybe monad
- Monads/Writer monad
- Mouse position
- Multiple regression

### N

### P

- P-Adic numbers, basic
- P-Adic square roots
- Padovan n-step number sequences
- Paraffins
- Pathological floating point problems
- Pentagram
- Percolation/Mean cluster density
- Percolation/Site percolation
- Perlin noise
- Permutations/Derangements
- Permutations/Rank of a permutation
- Pi
- Pinstripe/Printer
- Play recorded sounds
- Pragmatic directives
- Primality by Wilson's theorem
- Problem of Apollonius
- Pythagorean triples

### R

- RIPEMD-160
- RSA code
- Random sentence from book
- Read a file character by character/UTF8
- 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
- Send an unknown method call
- Sequence: nth number with exactly n divisors
- Set consolidation
- Shell one-liner
- 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
- Suffixation of decimal numbers
- Superellipse
- Superpermutation minimisation

### 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
- Tonelli-Shanks algorithm
- Topic variable
- 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

### D

### F

### G

### I

### L

### M

### N

- Names to numbers
- Native shebang
- Neighbour primes
- Next special primes
- Numbers divisible by their individual digits, but not by the product of their digits.
- Numbers which binary and ternary digit sum are prime
- Numbers with equal rises and falls
- Numeric separator syntax
- Numerical integration/Adaptive Simpson's method

### P

- Palindromic primes
- Parse EBNF
- Parse command-line arguments
- Penrose tiling
- Pentomino tiling
- Perceptron
- Permutations with some identical elements
- Piprimes
- Pisano period
- Price list behind API
- Prime triplets
- Primes with digits in nondecreasing order
- Print itself
- Process SMIL directives in XML data
- Pseudo-random numbers/Splitmix64
- 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
- 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
- Show the (decimal) value of a number of 1s appended with a 3, then squared
- Sine wave
- Singly-linked list/Element removal
- Smallest enclosing circle problem
- Smallest numbers
- Smallest square that begins with n
- Solve a Rubik's Cube
- Solve triangle solitare puzzle
- Solving coin problems
- Sorting algorithms/Tree sort on a linked list
- Special Divisors
- Special factorials
- Spoof game
- Square root by hand
- Starting a web browser
- Strassen's algorithm
- Sum data type
- Summarize 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.

## End of List[edit]

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