Rosetta Code

Rosetta Code:Village Pump/Suggest a programming task

< Rosetta Code:Village Pump
Revision as of 21:28, 29 August 2009 by rosettacode>Kevin Reid (move Tree traversal to completed)

So you want to see a problem solved? If you're not comfortable creating the task page yourself, feel free to edit this page, and describe the problem below. (To edit this page, click the "edit" tab at the top.)

When making a request, please place it in the Unsorted section.

When reviewing requests, please help sort them into the categories farther down, based on the category descriptions.

Incomplete

General

  • The Object oriented category is missing a lot of the basics like calling a method.
  • Closures
  • Monads
  • Sentinel value -- What values are commonly used for sentinel purposes. (This may end up beyond language comparison and delve into protocols) --Short Circuit 18:09, 9 June 2009 (UTC)
    • Perhaps Null should be generalized to cover this? --Kevin Reid 21:27, 29 August 2009 (UTC)
  • Check if defined -- Determine whether a variable has a defined value.
  • Applying a list of functions to a value. (As different from applying a function to a list of values.)Rahul 21:23, 9 December 2008 (UTC)
See First-class functions --Paddy3118 15:34, 24 February 2009 (UTC)
Not entirely appropriate. Nothing prevents one from having a list of function pointers in C or C++ to apply to the same pointer or reference to the value in question. However, there appears to be significant discussion whether C is even appropriate in the task you link to. --Short Circuit 07:52, 25 February 2009 (UTC)
Could this be added to Comparing two integers? --Mwn3d 07:28, 21 December 2007 (MST)
Type-variant rather suggests dynamic polymorphism, i.e. when the specific type of the value (and the value itself) depends on the type tag of the object. MS VARIANT is rather a different thing. It is a union, a container type which content depends on the value of the constraint. This is also a form polymorphism, but different, a dynamically constrained type. The type of the object does not vary. A similar case represents unbounded array, which size depends on the actual bounds (the constraint). (Granted, MS VARIANT serves the purpose of dynamic polymorphism, but that is merely because MS wished to keep it conform to non-OO languages.) --Dmitry-kazakov 13:24, 9 April 2009 (UTC)
  • Methinks it is like a weasel: It would be cool to have a collection of Methinks programs here in many languages. Source codes and information.

Games

  • Connect Four (or more) with variable and standard game board (6 rows, 7 columns)
    - but watch for trade mark violations etc --Paddy3118 17:33, 29 April 2009 (UTC)
    O.K., the games can be called The Captain's Mistress", because that is the original, much older verson of the "Connect Four" (wich was "invented" and copyrighted in 1974 by Milton Bradley, according to the Wikipedia.) --Borisbaran 12:33, 3 May 2009 (UTC)
    Then why not dots-and-crosses (five-in-a-line): discovered a site which call it this way, but I played it when I was eight y.o., and surely it's a very old game people played with paper and a pen long before anyone thought to register a copyright or what on it; instead of different colors, we can use a cross and a dot, and this is the name I knew it: "puntini e crocette" (dots and crosses)... But I think the interesting part would be to program the A.I. opponent... --ShinTakezou 14:07, 5 May 2009 (UTC)
    Reading it better... It's Gomoku! (But a paper can be like a board bigger than 19×19) --ShinTakezou 14:10, 5 May 2009 (UTC)
  • Dots and Boxes is quite a fun game to do, especially since the game has been around for ages and its strategies have been well studied. It's also quite easy to do just the GUI parts of the game, making a simple game for two players. —Dkf 12:15, 18 May 2009 (UTC)
    More possibilities are von Neumann, wireworld, and Langton cellular automata. They're not really games as such, but they're certainly interesting in similar ways. —Donal Fellows 14:58, 9 August 2009 (UTC)

Database / Network

  • Simple DB connection and queries.
  • Certificate-authenticated SSL
  • Secure Socket Layer

Data organization and encoding

System calls

  • Copy a directory tree recursively
    • On a local filesystem
    • With an option to specify files or folder to exclude
  • Open a named pipe
  • Demonstrate use of a foreign function interface to call a C-routine or library function

API-specific

  • Provide a SOAP server function

Library-specific

  • Create a COM client (with early binding) (particularly with GCC/MinGW) (if possible under Winelib in linux is also interesting)

Implementation-specific

Language-specific

Duck typing specifically my DuckDecoy Example? --Paddy3118 18:28, 5 May 2009 (UTC)

Project level

If possible, find ways to break these into smaller tasks which can ultimately be assembled into the final project.

Super Simple p2p network

Could be done with FIFOs for streams, and a constant number of clients. Needs to be more specific regarding what it does. --Short Circuit 22:28, 6 December 2007 (MST)
probably means some thing like this http://ansuz.sooke.bc.ca/software/molester/molester. To make it suitable for rc the restrictions need to be spelt out - i.e. fixing the protocol and discovery mechanisms Rahul 20:24, 7 October 2008 (UTC)

implement a table-based native code (macro?) assembler in various HLLs

Stateful behavior simulation

Demonstrate discrete event simulation and stateful behaviour by simulating a simple pick-and-place or storage/retrieval system robot. The robot would be given commands to retrieve from location A and place into location B. The robot would in turn command its 4 motors in sequence in order to accomplish the task. The amount of time that a motor runs would be dependant on the distance required to move. A scheduler would be set up to generate callback events to the motors at proper times to indicate their motion was complete. The complete specification of this task would be somewhat involved. --Rldrenth 18:09, 20 January 2009 (UTC)

This needs to be simplified/clarified from requiring "four motors" to having three commands, "set velocity forward/back", "no-op" and "claw open/close".
Subsequently, it can be divided into four parts:
  1. Call a function at a constant interval
  2. Create a function which reads from a primary queue containing simple commands and a secondary queue containing complex commands, processing exactly one of these commands, and then calls the state update function.
  3. Create a function that converts a complex command "starting from x1, pick up at x2 and drop at x3" to one of the three simple commands
  4. Create a function that updates the state (velocity and position) based on the currently executing command.

In the interest of simplicity, it can be assumed that the program may terminate once the secondary queue is empty, that the robot has a constant velocity either forward or backward, and that the velocity and position values at termination are irrelevant. --Short Circuit 05:40, 19 May 2009 (UTC)

Unit test framework

Demonstrate the use of a unit test framework for your language

Simple Shell

Execute system commands, pipes, I/O redirection, command history, custom PATH variable, etc. --CheesyPuffs144 01:44, 9 August 2009 (UTC)

Recently Completed

If a task has been completed, move the request to this category. Add a link to the task page, and sign (add --~~~~) to the request. Completed tasks more than a week old should be removed from the list.

Discuss

  • Querying devices for certain SNMP values and output reponses to .html or .txt-file.
    • Used for:
      • generating webpage where helpdesk can view the VLAN of a user-port
      • querying forwarding database of switch / ARP-table of router
    • Can be extended:
      • with config file for: device list, SNMP-values to interrogate, SNMP community strings, ...
      • support for SNMPv3
      • generating history reports: what mac-address has been on this port, when has a change been made, ...
    • Wanted to do this myself for a long time already using Python or Ruby, but not making a lot of progress. Any help or suggestion would be welcome.
This should probably be split into Query SNMP server and Retrieve configuration setting (for an application, not the SNMP server). There are already tasks for outputting to a file. --Short Circuit 23:43, 16 February 2008 (MST)
  • Win interface... C++ calls to Fortran F90/95 Source Code ... and back...
This should be as trivial as Call function in shared library, if the Fortran code has been compiled into a shared library. (Regardless of OS) --Short Circuit 23:43, 16 February 2008 (MST)
Serialization and deserialization are extremely common programming tasks, and there are a fair number of open formats for the purpose. Serialization and deserialization should probably get their own category under Category:Solutions by Programming Task. Additionally, json.org has a list of existing JSON implementations, sorted by language, to refer to. This should be a very quick thing to implement for JSON. Other formats that should be considered are XML and binary (packed) formats. --Short Circuit 04:38, 20 June 2009 (UTC)
  • Tree traversal: the only place I found that requirement was in Parametric Polymorphism which says to omit Tcl due to lack of static typing. But the task ist still interesting, and should be offered to any language, however typed. --Suchenwi 12:05, 25 May 2009 (UTC)
This is now Tree traversal
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