Hello World
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Hello World program in a terminal
The Hello World program is probably the most widely recreated piece of software ever as it is used by many programming languages books and articles as a cursory introduction into a language's syntax. It was introduced in the book The C Programming Language and is often one of the first programs that a programmer writes when learning a programming language, as it introduces the programmer to the constructs that he/she will be dealing with in the particular language at hand, familiarizing him with variables and output.
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The Hello World Collection in more than 300 programming languages