Shortest code to produce infinite output

Question

Write the shortest code you can that produces an infinite output.

That's all. You code will only be disqualified if it stops producing output at some point. As always in code golf, the shortest code wins.

Here's a list of answers that I think are really clever, so they can get credit:

• The comma is both code and data
• Infinite errors (that counts)
• Infinite warnings (that also counts)
• What's Marbelous?

Leaderboard

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Answer 1

!@#$%^&*()_+, 4 bytes

^(?)

Try it online!

Answer 2

Zsh, 3 bytes

yes

Try it online!

Answer 3

q/KDB, 13 chars

while[1;0N!1]

Outputs

1 

forever.

For more information on q/KDB :

• Wiki - Q programming language

Another Solution:

{0N!1}/[0<;1]

Answer 4

Quomplex, 6 4

[*1]

Infinitely outputs 1.

Answer 5

Bash - 13 bytes

cat /dev/zero

to see run cat -v /dev/zero

Documentation here: /dev/zero and here Purpose of /dev/zero?

Answer 6

Windows PowerShell (12)

for(;;){'-'}

Answer 7

Clojure

(repeat 1)

Returns a lazy seq of 1's '(1 1 1 1 1 1 1 1 1 1 ...)

Answer 8

Scala REPL (19 characters)

while(true)print(1)

Answer 9

PureBasic - 17 chars

r:
Debug 0
Goto r

A slight variation on the classic BASIC infinite loop :-)

Answer 10

JavaScript, 23 characters

while(1)console.log(1);

Answer 11

Processing, 26

for(int i=0;i<1;)print(1);

Prints 1 continuously.

Answer 12

Groovy, 14

for(;;)print 1

from the command line: groovy -e "for(;;)print 1"

Answer 13

JAVA - 72 chars:

counting everything:

class T{public static void main(String[]a){for(;;)System.out.print(0);}}

Obviously, Java was not built for code golfing.

Answer 14

Java, 74 characters

Since Java 7 and later versions seeks for main function at first instead of static block; I think this would be the best option to print infinite loops with small code. For your reference: static block won't execute in Java 7.

class I{public static void main(String[]a){for(;;)System.out.println(1);}}

Answer 15

C++ 29

main(){while(1)std::cout<<1;}

Answer 16

SCALA 18

while(1>0)print(1)

Answer 17

AppleScript:

repeat until 1 < 0
    say "hi"
end repeat

Answer 18

Groovy - 15 chars

for(;;)print 1

Answer 19

Clojure - 18 15 chars

(while 1(pr 1))

Answer 20

CoffeeScript, 14

Pretty unoriginal and similar to JavaScript:

alert 6while 1

Answer 21

PHP: 22 chars

<?PHP while(true){print(0);} ?>

My first golf, hope I did it right :)
It will hang your browser if you do it on a PHP page, but from the command line it does the expected: prints something until you get bored and stop it.

Answer 22

Chinese, 2 bytes

谕

Prints ÿ continuously.

Answer 23

I haven't seen Thue used here much, so here we go:

Thue (22 19 bytes)

a::=ab
b::=~1
::=
a

Answer 24

Cardinal, 3 characters

.%$

Explanation:

.    print active value
 %   start pointers here
  $  jump to x,y = active, inactive value


.%$

Pointers spread out in all cardinal directions from every %
All pointers carry two values, initialized to 0. The upper value is
called the active value, and it can be accessed directly. The lower
value is called inactive value. Inactive values can only be accessed
by flipping both values, switching the active to inactive, and the
inactive to active, or by using instructions like $ that grab the
inactive value directly to e.g. execute a jump.
The < and > below the values are the positional and directional
markers of the pointers. In programs, they instruct pointers to change
the movement direction.

0 0     At this step, the first active value (from the left pointer)
0 0     gets printed in the console, the right pointer is going to
<%>     jump to x,y=0,0

0      The jumped (former left) pointer prints out the next 0
0
>%$

 0
 0     ... travels on ...
.>$

  0
  0
.%>    ... reaches the jump instruction again, going to jump to 0,0 again

0
0
>%$    ... print out the next 0... and so on, to infinity.

http://esolangs.org/wiki/Cardinal

Answer 25

Bat, 2 chars

%0

The output is (starting from a blank line, I've added nbsp to make it visible bellow)

 
d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

d:\Temp\Supertemp>"D:\Temp\Supertemp\inf.bat"

Answer 26

><> Fish - 2 characters, I'm counting the shortest one.

Thijs beat me to it, but oh well. Here are a couple more ><> answers.

1n
-Infinite 1's, 2 bytes

   >"drlow ,olleH"l  
                  ?  
                  !  
   ^              <  
                  o  

-Infinite "Hello, world", 84 bytes.

Edit: Whoops. It's character count, not bytecount. I also fixed the first answer. Edit 2: Thanks mbomb007 for shaving off 1 character.

Answer 27

GoLunar, 4 bytes

This is the equivalent of 5543 zeros in a row in Unary, which is equivalent to +[.] in BrainF***.

5543

Answer 28

BotEngine, 1x3=3

Noncompeting as BotEngine is much too recent a language. Anyway, here we go:

>CT

It starts with a right-moving bot on the >. When it reaches the C, it creates a left-moving bot (which starts on the C.) On the next step, the left-moving bot reaches the > and is turned around to move right and the right-moving bot reaches the T, destroying itself and printing TRUE. The step after that, the other bot gets to the C starting the process over again.

>CF also works but prints FALSE instead of TRUE. Using P in this case would print empty lines instead.

Answer 29

Javascript ES6, 28 bytes

setInterval`console.log()`

I didn't want to code an infinite for loop like everyone else...

Try it here using anything BUT Firefox.

Answer 30

Mouse-2002, 3 bytes

(0!)

prints 0 forever.

---

Alternatively, for a more interesting and (theoretically) infinite error with no loop, the Ackermann Function in 99 bytes in this language:

"M>"?a:"N>"?b:#Y,a.b.;$Y1%n:2%m:m.0=k:n.0=j:j.k.>[n.1+!|j.k.<[#Y,m.1-,1;!|#Y,m.1-,#Y,n.,n.1-;;!]]]@

Expanded:

"M>" ? a:
"N>" ? b:

1 a:
1 b:

#Y, a. b.;!

$Y 1% n: 2% m: ~ ack
  m. 0 = k: ~ store whether m == 0 in k
  n. 0 = j:
  j. k. > [ ~ if y>x
    n.1+ ~ print it
  | j. k. < [ ~ if x>y
    #Y, m. 1-, 1;
  | #Y, m. 1-, #Y, m.,n. 1-;;!
    ]
   ]
  ]
@
$

Errors recursively, forever, as long as the input was a positive nonzero integer. (result of a bug in the interpreter: the code is correct!)