"Hello, World!" program

While several small test programs have existed since the development of programmable computers, the tradition of using the phrase "Hello, World!"

was introduced as a slightly longer greeting that required several character constants for its expression.

has seen various deviations in casing and punctuation, such as the capitalization of the leading H and W, and the presence of the comma or exclamation mark.

Some devices limit the format to specific variations, such as all-capitalized versions on systems that support only capital letters, while some esoteric programming languages may have to print a slightly modified string.

For example, the first non-trivial Malbolge program printed "HEllO WORld", this having been determined to be good enough.

[9] Another notable example is the Rust language, whose management system automatically inserts a "Hello, World" program when creating new projects.

(assembly language, C, VHDL) may also be used in embedded systems, where text output is either difficult (requiring added components or communication with another computer) or nonexistent.

may thus be substituted with a blinking light-emitting diode (LED), which demonstrates timing and interaction between components.

It serves as a sanity check and a simple example of installing a software package.

[17] Mark Guzdial and Elliot Soloway have suggested that the "hello, world" test message may be outdated now that graphics and sound can be manipulated as easily as text.

program in Malbolge (which actually output "HEllO WORld") took two years to be announced, and it was produced not by a human but by a code generator written in Common Lisp (see § Variations, above).