Loops/Infinite

Loops/Infinite
You are encouraged to solve this task according to the task description, using any language you may know.

Specifically print out "SPAM" followed by a newline in an infinite loop.

ActionScript

<lang actionscript>while (true) {

   trace("SPAM");

}</lang>

Ada

<lang ada>loop

  Put_Line("SPAM");

end loop;</lang>

ALGOL 68

<lang algol68>DO

 printf($"SPAM"l$)

OD</lang> Or the classic "dynamic halt": <lang algol68>loop x:

  printf($"SPAM"l$);

loop x</lang>

AmigaE

<lang amigae>PROC main()

 LOOP
   WriteF('SPAM')
 ENDLOOP

ENDPROC</lang>

AutoHotkey

<lang autohotkey>Loop

 MsgBox SPAM `n</lang>

AWK

<lang awk>BEGIN {

 while(1) {
   print "SPAM"
 }

}</lang>

BASIC

Works with: QuickBasic version 4.5

Old-fashioned syntax: <lang qbasic>while 1

 print "SPAM"

wend</lang>

Standard BASIC: <lang qbasic>do

 print "SPAM"

loop</lang>

Also <lang qbasic>for i = 1 to 10 step 0

 print "SPAM"

next i</lang>

With classic (minimal) BASIC, the standard way to make an infinite loop would be:

10 PRINT "SPAM"
20 GOTO 10

Befunge

Because the 2-D code space is toroidal, all loops are infinite unless explicitly stopped with @. <lang befunge>55+"MAPS",,,,,</lang>

Brainf***

<lang bf>++++++++++[->++++++>++++++++>+<<<]>+++++> [+++.---.<.>---.+++>.<]</lang>

C

<lang c>while(1) puts("SPAM\n");</lang> or <lang c> for(;;) puts("SPAM\n");</lang> or <lang c>do { puts("SPAM\n"); } while(1);</lang>

C++

Translation of: C

<lang cpp>while (true)

 std::cout << "SPAM\n";</lang>

or <lang cpp>for (;;)

 std::cout << "SPAM\n";</lang>

or <lang cpp>do

 std::cout << "SPAM\n";

while (true);</lang>

C#

<lang csharp>while (true) {

   Console.WriteLine("SPAM");

}</lang>

ColdFusion

This will result in a JRun Servlet Error and heap dump.

With tags: <lang cfm><cfloop condition = "true NEQ false">

 SPAM

</cfloop></lang> With script: <lang cfm><cfscript>

 while( true != false )
 {
   writeOutput( "SPAM" );
 }

</cfscript></lang>

Clojure

<lang lisp>(loop [] (println "SPAM") (recur))</lang>

Common Lisp

<lang lisp>(loop (write-line "SPAM"))</lang>

D

<lang d>while(true) writefln("SPAM") ;</lang> <lang d>for(;;) writefln("SPAM") ;</lang> <lang d>l: writefln("SPAM"); goto l;</lang>

E

<lang e>while (true) {

   println("SPAM")

}</lang>

<lang e>def f() {

   println("SPAM")
   f <- ()

} f <- ()</lang>

The difference between these is that in the second, other activities can be interleaved with the loop; in the first, no other processing will occur in this vat.

Erlang

<lang erlang>-module (main). -export ([main/1]).

main(Any) ->

 io:fwrite("SPAM~n",[]),
 main(Any)</lang>

FALSE

<lang false>[1]["SPAM "]#</lang>

Forth

<lang forth>: email begin ." SPAM" cr again ;</lang>

Fortran

Works with: Fortran version 90 and later

<lang fortran>DO

 WRITE(*,*) "SPAM"

END DO</lang> Although deprecated GOTO is still available <lang fortran>10 WRITE(*,*) "SPAM"

  GOTO 10</lang>

Go

<lang go>package main import "fmt" func main() { for { fmt.Printf("SPAM\n") } }</lang>

Groovy

<lang groovy>while (true) {

println 'SPAM'

}</lang>

Haskell

<lang haskell>forever (putStrLn "SPAM")</lang>

Icon

<lang icon>procedure main()

  every write(|"SPAM")

end</lang>

IDL

<lang IDL>while 1 do print,'SPAM'</lang>

J

<lang j>-@:(][ 1!:2&2@('SPAM'"_)) (^:_) 1</lang>

Alternatively,

<lang j>smoutput bind 'SPAM'^:1e99 </lang>

This implementation relies on numeric inaccuracies in IEEE floating point notation. For example, 1+1e98 is exactly equal to 1e98. That said, 1e99 iterations would still be significantly longer than the practical life of any machine anyone would care to dedicate to this task.

Java

<lang java>while(true){

  System.out.println("SPAM");

}</lang>

<lang java>for(;;){

  System.out.println("SPAM");

}</lang>

JavaScript

<lang javascript>for (;;) print("SPAM"); while (true) print("SPAM");</lang>

Joy

<lang joy>DEFINE loop == [1] swap while.

["SPAM\n" putchars] loop.</lang>

Lisaac

The "lisaac" compiler apparently doesn't like infinite loops. Using a static slot (variable) seems to be the only way to get away with "Recursivity without end (call_slot)." error. <lang Lisaac>- i : INTEGER; i := 1; { i = 1 }.while_do {

 "SPAM\n".print;

};</lang>

Logo

<lang logo>forever [print "SPAM]</lang>

M4

<lang M4>define(`spam',`SPAM spam') spam</lang>

Make

<lang make>spam:

  @echo SPAM
  $(MAKE)</lang>

MAXScript

<lang maxscript>while true do print "SPAM\n"</lang>

Metafont

<lang metafont>forever: message "SPAM"; endfor end</lang>

Modula-3

<lang modula3>LOOP

 IO.Put("SPAM\n");

END;</lang>

MOO

<lang moo>while (1)

 player:tell("SPAM");

endwhile</lang>

OCaml

<lang ocaml>while true do

 print_endline "SPAM"

done</lang>

or

<lang ocaml>let rec inf_loop() =

 print_endline "SPAM";
 inf_loop()

in inf_loop()</lang>

Seen like this it looks like the "too much functional" danger when a "while" loop looks far simpler, but the functional loop may be useful to provide data to the next loop without using mutable variable.

Octave

<lang octave>while(1)

 disp("SPAM")

endwhile</lang>

Pascal

<lang pascal>while true do

 writeln('SPAM');</lang>

Alternatively: <lang pascal>repeat

 writeln('SPAM')

until false;</lang>

Perl

<lang perl>print "SPAM\n" while 1;</lang>

Perl 6

Works with: Rakudo version #21 "Seattle"

<lang perl6>loop {

   say 'SPAM';

}</lang>

PHP

<lang php>while(1)

   echo "SPAM\n";</lang>

Pop11

<lang pop11>while true do

   printf('SPAM', '%p\n');

endwhile;</lang>

PowerShell

<lang powershell>for () {

   "SPAM"

}</lang>

Prolog

<lang prolog>repeat, write('SPAM'), nl, fail.</lang>

Python

<lang python>while 1:

  print "SPAM"</lang>

Note: one can also use: "True" or any other non-false value. In Python the following values are false: 0, "" (empty string), (,) and {} and [] (empty tuples, dictionaries or lists), None (the special object), and the False object. Any non-empty collection or string or non-zero numeric value is considered "True"

R

Note that the default R Gui buffers outputs before pushing them to the screen. To see this run either run in terminal mode, right click on the GUI window and deselect "Buffered Output" prior to execution, or add a call to flush.console() in the loop.

<lang R>repeat print("SPAM")</lang>

Ruby

<lang ruby>loop do

  puts "SPAM"

end</lang>

Scheme

<lang scheme>(do ()

   (#f)
   (display "SPAM")
   (newline))</lang>

Slate

<lang slate>[inform: 'SPAM'] loop</lang>

Smalltalk

<lang smalltalk>[ true ] whileTrue: [ 'SPAM' displayNl ]</lang>

SNUSP

<lang snusp>@\>@\>@\>@\>++++++++++===!/ < < < < \

|  |  |  \M=@@@@+@+++++# \.>.>.>.>./
|  |  \A=@@+@@@@+++#
|  \P=@@+@@+@@+++#
\S=@@+@+@@@+++#</lang>

Standard ML

<lang sml>while true do

 print "SPAM\n";</lang>

or

<lang sml>let

 fun inf_loop () = (
   print "SPAM\n";
   inf_loop ()
 )

in

 inf_loop ()

end</lang>

Seen like this it looks like the "too much functional" danger when a "while" loop looks far simpler, but the functional loop may be useful to provide data to the next loop without using mutable variable.

Transact-SQL

<lang sql>WHILE 1=1 BEGIN

PRINT "SPAM"

END</lang>

Tcl

<lang tcl>while true {

   puts SPAM

}

1. or

for {} 1 {} {

   puts SPAM

}</lang>

TI-89 BASIC

<lang ti89b>Loop

 Disp "SPAM"

EndLoop</lang>

UNIX Shell

Works with: Bourne Shell

Works with: Korn Shell

Works with: Public Domain Korn SHell

Works with: Almquist SHell

Works with: Debian Almquist SHell

Works with: Bourne Again SHell

Works with: Z Shell

<lang bash>while :; do echo SPAM; done</lang>

UnixPipes

<lang bash> yes SPAM</lang>

Unlambda

<lang unlambda> ``ci``s``s`kr``s``s``s``s`k.S`k.P`k.A`k.Mii</lang>

V

<lang v>true [

  'SPAM' puts

] while</lang>

Vedit macro language

<lang vedit>while (1) {

   Message("Spam\n")

}</lang> or: <lang vedit>do {

   Message("Spam\n")

} while (1)</lang> or: <lang vedit>for (;1;) {

   Message("Spam\n")

}</lang> "Nearly infinite" loop can be done by using constant ALL (=1073741824) as repeat count: <lang vedit>Repeat (ALL) {

   Message("Spam\n")

}</lang>

Visual Basic

<lang vb>Do

   Debug.Print("SPAM")

Loop</lang>

Visual Basic .NET

Platform: .NET

Works with: Visual Basic .NET version 9.0+

<lang vbnet>Do

   Console.WriteLine("SPAM")

Loop</lang>