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A "Hello, World!" program is usually a simple computer program that emits (or displays) to the screen (often the console ) 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 .
The "Hello world" program uses printf in its simplest form: by simply passing it a string with no special formatting codes, and no extra arguments. The input text is simply printed to the screen. (Note that the "\n" special escape sequence is converted into a newline character.)
printf is a C standard library function that formats text and writes it to standard output. The name, printf is short for print formatted where print refers to output to a printer although the functions are not limited to printer output. The standard library provides many other similar functions that form a family of printf-like functions.
In this call, the printf function is passed (i.e. provided with) a single argument, which is the address of the first character in the string literal "hello, world\n". The string literal is an unnamed array set up automatically by the compiler, with elements of type char and a final NULL character (ASCII value 0) marking the end of the array ...
Original – The first known version "Hello, World!" program by Brian Kernighan from Artsy's Algorythm Auction based on a 1974 Bell Laboratories internal memorandum, "Programming in C: A Tutorial". Reason High quality file of historical value, excellent EV and importance in the computing and programming. Articles in which this image appears ...
A hello world program that conforms to the C standard is also a valid C++ hello world program. The following is Bjarne Stroustrup's version of the Hello world program that uses the C++ Standard Library stream facility to write a message to standard output: [69] [70] [note 2]
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Therefore, it is legal to call such a function with one or more arguments, e.g. foo(42, "hello world"). In contrast, in C++ a function prototype without arguments means that the function takes no arguments, and calling such a function with arguments is ill-formed.