java:

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

python2:

print "Hello world!"

python3:

print ("Hello world!")

C/C++:

#include <stdio.h>int main(){ printf("Hello world!\n"); return 0;}

Linux intel asm(由於知道不支援組合語言，因此可讀性會差一點):[section data]msg db "Hello world!", 0axlen equ $ - msg[section text]global _start_start: mov eax, 4 mov ebx, 1 mov ecx, msg mov edx, len int 0x80 mov eax, 1 mov ebx, 0 int 0x80Linux AT&T asm(由於知道不支援組合語言，因此可讀性會差一點):.datamsg: .ascii "Hello world!\n"len = . - msg.text.globl _start_start: movl $4, %eax movl $1, %ebx movl $msg, %ecx movl $len, %edx int $0x80 movl $1, %eax movl $0, %ebx int $0x80php:

<?phpecho "Hello world!"?>