Editing ALGOL (section)

===Timeline: Hello world===
The variations and lack of portability of the programs from one implementation to another is easily demonstrated by the classic [[hello world program]].{{citation needed|date = February 2024}}

====ALGOL 58 (IAL)====
{{main|ALGOL 58}}
ALGOL 58 had no I/O facilities.

====ALGOL 60 family====
{{main|ALGOL 60}}
Since ALGOL 60 had no I/O facilities, there is no portable [[hello world program]] in ALGOL.
The next three examples are in Burroughs Extended Algol. The first two direct output at the interactive terminal they are run on. The first uses a character array, similar to C. The language allows the array identifier to be used as a pointer to the array, and hence in a REPLACE statement.
{{sxhl|2=m2|1=
 BEGIN
   FILE F(KIND=REMOTE);
   EBCDIC ARRAY E[0:11];
   REPLACE E BY "HELLO WORLD!";
   WRITE(F, *, E);
 END.
}}
A simpler program using an inline format:
{{sxhl|2=m2|1=
 BEGIN
   FILE F(KIND=REMOTE);
   WRITE(F, <"HELLO WORLD!">);
 END.
}}
An even simpler program using the Display statement. Note that its output would end up at the system console ('SPO'):

{{sxhl|2=m2|1= BEGIN DISPLAY("HELLO WORLD!") END.}}

An alternative example, using Elliott Algol I/O is as follows.  Elliott Algol used different characters for "open-string-quote" and "close-string-quote", represented here by {{color box|rgba(255,255,255,0)|border=silver|[[‘]]}} and {{color box|rgba(255,255,255,0)|border=silver|[[Single quotation mark|’]]}}.
{{sxhl|2=pascal|1=
 program HiFolks;
 begin
    print ‘Hello world’
 end;
}}
Below is a version from Elliott 803 Algol (A104). The standard Elliott 803 used five-hole paper tape and thus only had upper case.  The code lacked any quote characters so £ (UK Pound Sign) was used for open quote and ? (Question Mark) for close quote.  Special sequences were placed in double quotes (e.g£. £L?? produced a new line on the teleprinter).

   HIFOLKS'
   BEGIN
      PRINT £HELLO WORLD£L??'
   END'

The [[ICT 1900 series]] Algol I/O version allowed input from paper tape or punched card.  Paper tape 'full' mode allowed lower case.  Output was to a line printer. The open and close quote characters were represented using '(' and ')' and spaces by %.<ref>{{cite web|url=http://www.icl1900.co.uk/techpub/tp3340.djvu|title=ICL 1900 series: Algol Language|publisher=ICL Technical Publication 3340|year=1965}}</ref>
   'BEGIN'
      WRITE TEXT('('HELLO%WORLD')');
   'END'

====ALGOL 68====
{{main|ALGOL 68}}

'''ALGOL 68''' code was published with reserved words typically in lowercase, but bolded or underlined.
 '''begin'''
   printf(($gl$,"Hello, world!"))
 '''end'''
In the language of the "Algol 68 Report" the [[input/output]] facilities were collectively called the "Transput".