Hello World in Different Languages

"Hello, World!" is a simple program that outputs or displays the string "Hello, World!" to the user. It's traditionally used as the first program that new programmers learn, mainly for the following reasons:

1. Simplicity: A "Hello, World!" program is typically one of the simplest programs possible in most programming languages, which makes it a good way for beginners to see the basic syntax of a programming language without being overwhelmed by complex concepts.

2. Verification: Running a "Hello, World!" program verifies that your development environment is set up correctly. If you can successfully run such a program, you know that your compiler/interpreter, development environment, and general setup are functioning as expected.

3. Tradition: The practice has become a programming tradition after it was used in the seminal book "The C Programming Language" by Brian Kernighan and Dennis Ritchie. The tradition has been carried forward to nearly every language since then.

"Hello, World!" can be a stepping stone to more complex programs, and it's often the first example given in programming language tutorials.

Assembly:

lobal _start

section .text

_start:
  mov rax, 1        ; write(
  mov rdi, 1        ;   STDOUT_FILENO,
  mov rsi, msg      ;   "Hello, world!\n",
  mov rdx, msglen   ;   sizeof("Hello, world!\n")
  syscall           ; );

  mov rax, 60       ; exit(
  mov rdi, 0        ;   EXIT_SUCCESS
  syscall           ; );

section .rodata
  msg: db "Hello, world!", 10
  msglen: equ $ - msg

Cobol

IDENTIFICATION DIVISION.
PROGRAM-ID. HELLOWRD.

PROCEDURE DIVISION.
DISPLAY "HELLO WORLD".
STOP RUN.

C

#include <stdio.h>
int main() {
   // printf() displays the string inside quotation
   printf("Hello World!");
   return 0;
}

C++

#include <iostream>

int main() {
    std::cout << "Hello World!";
    return 0;
}

C#

using System;
namespace HelloWorld
{
     class Program
     {
        static void Main(string[] args)
        {
             Console.WriteLine("Hello World!");             
        }
     }
}

Java

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

JavaScript:

document.write('Hello World!');

Python

print('Hello, world!')