hello, world - definição. O que é hello, world. Significado, conceito
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O que (quem) é hello, world - definição

COMPUTER PROGRAM THAT PRODUCES THE MESSAGE "HELLO, WORLD!", OFTEN USED TO ILLUSTRATE THE BASIC SYNTAX OF A PROGRAMMING LANGUAGE
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hello, world         
<programming> The canonical minimal test message in the C/Unix universe or any of the minimal programs that emit this message. Traditionally, the first program a C coder writes in a new environment is one that just prints "hello, world" to standard output (and indeed it is the first example program in K&R). Environments that generate an unreasonably large executable for this trivial test or which require a hairy compiler-linker invocation to generate it are considered bad. (2007-10-30)
"Hello, World!" program         
A "Hello, World!" program is generally a computer program that ignores any input and outputs or displays a message similar to "Hello, World!
Hello World (disambiguation)         
WIKIMEDIA DISAMBIGUATION PAGE
Hello World (album); Hello World (song)
A "Hello, World!" program generally is a computer program that outputs or displays the message "Hello, World!

Wikipédia

"Hello, World!" program

A "Hello, World!" program is generally a computer program that ignores any input and outputs or displays a message similar to "Hello, World!". A small piece of code in most general-purpose programming languages, this program is used to illustrate a language's basic syntax. "Hello, World!" programs are often the first a student learns to write in a given language, and they can also be used as a sanity check to ensure computer software intended to compile or run source code is correctly installed, and that its operator understands how to use it.