Hello World (ALGOL 68)

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This short ALGOL 68 program prints a message to the console.

<<hello_world.a68>>=
main:
(
        printf($"Hello World!"l$)
)

The standard prelude provides the declaration for printf(). ALGOL 68 programs always enter at the beginning of of the code, the label "main" is optional, typically the "main:" label is replaced with jobcards for setting up the compilation, and running the job. No result is returned to the operating system, however in the standard "postclude" there is a "stop:" label available to stop the program early. We could use putf(stand out,(..)) instead of printf(...) in this simple example.

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