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Frequently asked questions
i.e. few things about ideone that you may want to know.
What is ideone?
See the page
about ideone.com.
Are there any samples available?
Yes, many samples can be found in our
samples section.
What is the difference between private and public code?
Public codes are listed in the
recent codes section,
while private codes do not appear there.
Are there any memory or time constraints for the submitted programs?
Yes, they are as follows:
- compilation time: 10 seconds,
- execution time: 5 (by default and for not logged in users) or 15 seconds (this can be set from account settings page),
- memory usage: 256 MB.
Can I access the network from my program?
No, access to the network is blocked.
Can I write or read files in my program?
No, only stdin and stdout are allowed.
How long my codes will be available?
Forever.
What is the size limit for the source code, input data and output data?
64 kB.
How many processes can I create?
Up to 16 processes can be created. It means, for example, that you can use 15 pipelines in the bash.
Which encoding is used in the source code and in the input stream by default?
UTF-8.
How is EOL represented in the source code and in the input stream?
End of line is represented by
\n
(LF, Linux style). Even if you submit input or source code
with Windows EOL (
\r\n
, CRLF) or Mac OS EOL (
\r
, CR), end-of-lines will be converted to the Linux style.
My program seems to have a correct syntax. Why does it fail to compile?
Be sure to place "main" class/program/module/function/procedure in your code (check samples
here).
What should I do when I get internal error?
Resubmit your code once or twice. If that won't help, please contact us.
Visibility of a submission - what's that?
Visibility determines how a submission is visible on ideone.com and who can access it. Possible values are:
- public - everyone has access to the submission and it is visible on the recent page;
- private - everyone has access to the submission and it is not listed on the recent page;
- user's - only author has access to the submission and the submission is not listed on the recent page. To use this level of visibility you have to be logged in.
What does enable normal time stamps option in account settings do?
Check this option to see dates in normal format (
2010-06-06 06:06:06) rather than in 'ago' format (
6 hours 6 minutes ago).
It turns off facebook comments on pages of the codes.
What does publishing of a label give me?
Publishing of a label causes that all the submissions (public and private, but not with the
user's visibility) with that label are available as a list at the same address. You can use this feature to easily share many submissions at once.
How to publish one or more submissions on a single page?
You can use labels. See
What does publishing of a label give me? above.
What characters are allowed for a label name?
Allowed characters for a label name are (without
[ and
]): [
A-Za-z0-9_#!@()[]/+ -]
What is a link and what characters are allowed for the link?
Link is a part of the address to a site created by publishing a label. Allowed characters for the link are (without
[ and
]): [
a-z0-9_-]
What does template action do?
The
template action on the page of the submission allows to set the submission as a template for a particular language. When set, the template can be loaded into the source code text area on the home page. The template is visible only for the owner of the submission.
I would like to see a new language on Ideone. Is there anything I can do about this?
Yes, persuade Gentoo developers to create a proper package and if that works, let us know :)
What programming languages are supported on ideone.com?
Following programming languages are supported on ideone.com:
| name |
version |
id (for api) |
| Ada |
gnat-4.6 |
7 |
| Assembler |
nasm-2.10.01 |
13 |
| Assembler |
gcc-4.7.2 |
45 |
| AWK (gawk) |
gawk-3.1.6 |
104 |
| AWK (mawk) |
mawk-1.3.3 |
105 |
| Bash |
bash 4.0.35 |
28 |
| bc |
bc-1.06.95 |
110 |
| Brainf**k |
bff-1.0.3.1 |
12 |
| C |
gcc-4.7.2 |
11 |
| C# |
mono-2.8 |
27 |
| C++ 4.3.2 |
gcc-4.3.2 |
41 |
| C++ 4.7.2 |
gcc-4.7.2 |
1 |
| C++11 |
gcc-4.7.2 |
44 |
| C99 strict |
gcc-4.7.2 |
34 |
| CLIPS |
clips 6.24 |
14 |
| Clojure |
clojure 1.5.0-RC2 |
111 |
| COBOL |
open-cobol-1.0 |
118 |
| COBOL 85 |
tinycobol-0.65.9 |
106 |
| Common Lisp (clisp) |
clisp 2.47 |
32 |
| D (dmd) |
dmd-2.042 |
102 |
| Erlang |
erl-5.7.3 |
36 |
| F# |
fsharp-2.0.0 |
124 |
| Factor |
factor-0.93 |
123 |
| Falcon |
falcon-0.9.6.6 |
125 |
| Forth |
gforth-0.7.0 |
107 |
| Fortran |
gfortran-4.7.2 |
5 |
| Go |
1.0.3 |
114 |
| Groovy |
groovy-2.1.0-rc-1 |
121 |
| Haskell |
ghc-7.4.1 |
21 |
| Icon |
iconc 9.4.3 |
16 |
| Intercal |
c-intercal 28.0-r1 |
9 |
| Java |
sun-jdk-1.7.0_10 |
10 |
| Java7 |
sun-jdk-1.7.0_10 |
55 |
| JavaScript (rhino) |
rhino-1.7R4 |
35 |
| JavaScript (spidermonkey) |
spidermonkey-1.7 |
112 |
| Lua |
luac 5.1.4 |
26 |
| Nemerle |
ncc 0.9.3 |
30 |
| Nice |
nicec 0.9.6 |
25 |
| Nimrod |
nimrod-0.8.8 |
122 |
| Node.js |
0.8.11 |
56 |
| Objective-C |
gcc-4.5.1 |
43 |
| Ocaml |
ocamlopt 3.10.2 |
8 |
| Octave |
3.6.2 |
127 |
| Oz |
mozart-1.4.0 |
119 |
| PARI/GP |
2.5.1 |
57 |
| Pascal (fpc) |
fpc 2.6.2 |
22 |
| Pascal (gpc) |
gpc 20070904 |
2 |
| Perl |
perl 5.16.2 |
3 |
| Perl 6 |
rakudo-2010.08 |
54 |
| PHP |
php 5.4.4 |
29 |
| Pike |
pike 7.6.86 |
19 |
| Prolog (gnu) |
gprolog-1.3.1 |
108 |
| Prolog (swi) |
swipl 5.6.64 |
15 |
| Python |
python 2.7.3 |
4 |
| Python 3 |
python-3.2.3 |
116 |
| R |
R-2.11.1 |
117 |
| Ruby |
ruby-1.9.3 |
17 |
| Scala |
scala-2.10.0 |
39 |
| Scheme (guile) |
guile 1.8.5 |
33 |
| Smalltalk |
gst 3.1 |
23 |
| SQL |
sqlite3-3.7.3 |
40 |
| Tcl |
tclsh 8.5.7 |
38 |
| Text |
text 6.10 |
62 |
| Unlambda |
unlambda-2.0.0 |
115 |
| VB.NET |
mono-2.4.2.3 |
101 |
| Whitespace |
wspace 0.3 |
6 |
Write at
contact@ideone.com.
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