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Variations of the 'Hello, World!' program that produce a graphical output (as opposed to text output) have also been shown. deb package, either traditionally or using debhelper, and the version of hello used, GNU Hello, serves as an example of writing a GNU program. For developers, it provides an example of creating a.

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It serves as a sanity check and a simple example of installing a software package. The Debian and Ubuntu Linux distributions provide the 'Hello, World!' program through their software package manager systems, which can be invoked with the command hello. For devices such as microcontrollers, field-programmable gate arrays, and CPLDs, 'Hello, World!' may thus be substituted with a blinking LED, which demonstrates timing and interaction between components. Languages otherwise capable of printing 'Hello, World!' (Assembly, C, VHDL) may also be used in embedded systems, where text output is either difficult (requiring additional components or communication with another computer) or nonexistent. Functional programming languages, such as Lisp, ML, and Haskell, tend to substitute a factorial program for 'Hello, World!', as functional programming emphasizes recursive techniques, whereas the original examples emphasize I/O, which violates the spirit of pure functional programming by producing side effects. Some languages change the functionality of the 'Hello, World!' program while maintaining the spirit of demonstrating a simple example. Ī 'Hello, World!' message being displayed through long-exposure light painting with a moving strip of LEDs Other human languages have been used as the output for example, a tutorial for the Go programming language outputted both English and Chinese or Japanese characters, demonstrating the programming language's built-in Unicode support. For example, the first non-trivial Malbolge program printed 'Hello world', this having been determined to be good enough. 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.

The phrase 'Hello, World!' has seen various deviations in casing and punctuation, such as the capitalization of the leading H and W, and the presence of the comma and/or exclamation mark. Generally, programming languages that give the programmer more control over the machine will result in more complex 'Hello, World!' programs.

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In contrast, the equivalent code in C++ requires the import of the input/output software library, the manual declaration of an entry point, and the explicit instruction that the output string should be sent to the standard output stream. For example, in Python, to print the string Hello, World! followed by a newline, one only needs to write print ( 'Hello, World!' ). In some languages, particularly scripting languages, the 'Hello, World!' program can be written as a single statement, while in others (particularly many low-level languages) there can be many more statements required. 'Hello, World!' programs vary in complexity between different languages.

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A 'Hello, World!' program running on Sony's PlayStation Portable as a proof of concept