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"

See also

99 Bottles of Beer

External links

The Hello World Collection in more than 300 programming languages