Hello World

Results of executing a Hello World program in a console on a Linux or Unix system.

A Hello World program, as first introduced in the book The C Programming Language, is a very short program that typically just prints a word or two of output to a console. Such a program is often one of the first programs that a programmer writes when learning a programming language, as it provide's a cursory introduction to the language's syntax and output.

Example in some of the most popular languages

Example in C

#include <stdio.h>

int main()
{
    printf("This is my first C program!\n");
    return 0;
}

Example in C++

// Hello World in C++ (pre-ISO)

#include <iostream.h>

main()
{
    cout << "Hello World!" << endl;
    return 0;
}

Example in Java

// Hello World in Java

class HelloWorld {
  static public void main( String args[] ) {
    System.out.println( "Hello World!" );
  }
}

Example in Perl

# Hello world in perl

print "Hello World!\n";

Example in PHP

<?php
  // Hello World in PHP
  echo 'Hello World!';
?>

Example in Python

# Hello World in Python
print "Hello world"

Example in VBScript

'Hello World in VBScript
WScript.Echo "Hello world"

Hello World in Other Languages

Erlang
MySQL

See also

99 Bottles of Beer

External links

The Hello World Collection in more than 300 programming languages