“Hello, World!”程序是一个只在计算机屏幕上打印出“Hello, World!”(英语,意为“世界,你好!”)字串的计算机程序。该程序通常是计算机程序设计语言的初学者所要学习编写的第一个程序。它还可以用来确定该语言的编译器、程序开发环境以及运行环境已经正确安装。 5.$/]2VK
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 [/o BjiBA
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以下是用不同语言写成的Hello World程序的几个例子: wk#cJ`wG;
Ada N[A9J7}_R
with Ada.Text_Io; use Ada.Text_Io; U@9v(TfV
procedure Hello is Re+oCJ
begin $R%tD.d3
Put_Line ("Hello, world!"); I?
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end Hello; `S+n,,l
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汇编语言 Ma4eu8
_Q 'f^Kj
x86 CPU,DOS,TASM g:Q:cSg<
MODEL SMALL PeIKx$$Kl{
IDEAL P?^%i
STACK 100H Q zg?#|
6"?#E[ #[
DATASEG _Wq;bKG
HW DB 'Hello, world!$' m>|7&l_
wrc1N?[bn
CODESEG ;l^'g}dQ^
MOV AX, @data E
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MOV DS, AX znDpg{U(
MOV DX, OFFSET HW ht#,v5oG>f
MOV AH, 09H Ii#+JY0k
INT 21H 9oIfSr,y
MOV AX, 4C00H ?D|kCw69SE
INT 21H 3xN_z?Rg
END 3-oKY*jO
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x86 CPU,GNU/Linux,NASM %g^:0me`
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). wwv+s ~(0
;Enter this into "hello.asm" then type: r9*6=*J|
;"nasm -f elf hello.asm" 'y5H%I!
;"ld hello.o -o hello" (&u'S+
;"./hello"
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section .data ;data section declaration &bGf{P*Da
msg db 'Hello World!',0AH 0dQ\Y]b
len equ $-msg ;string length qQIX:HWDKZ
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section .text ;code section declaration qA[cF$CIl)
global _start ;entry point (start of execution) scTt53v^
_start: mov edx,len ;string length C4GkFD
mov ecx,msg ;string start ;.<HpDfG_
mov ebx,1 ;file handle: stdout rxs:)# ?A
mov eax,4 ;sys_write R](cko=
int 80h ;kernel system call [:}"MdU'
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mov ebx,0 ;return value I0><IaFy
mov eax,1 ;sys_exit LM 1Vsh<
int 80h ;kernel system call U(Bmffn4Z
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x86 CPU,Windows,MASM32 ;)SWwhQ
.386 ;@:-T/=
.model flat,stdcall &;`E3$>
option casemap:none }$sTnea
;Include 文件定义 xJnN95`R@
include windows.inc 6'x3g2C/
include user32.inc MttFB;Tp
includelib user32.lib )]LP8
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include kernel32.inc yhI;FNSf
includelib kernel32.lib LPZ\T}<l
;数据段 ];5Auh0o
.data KfPgj
szCaption db 'A MessageBox!',0 '1fyBU
szText db 'Hello,world!',0 d(@ ov^e-
;代码段 BjfTt:kY
.code Ed{sC[j=
start: g$vOWSI+
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK fU\;\
invoke ExitProcess,NULL D #7q3s
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> bE@Eiac
end start P}>>$$b\Yi
sTep2W.9
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V
AWK M;NIcM
BEGIN { print "Hello, world!" } \rg;xZa5
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BASIC CJwzjH
传统版BASIC(例如GWBASIC): tA,J~|+f:
Y^U^yh_!^
10 PRINT "Hello, world!" fZLAZMrM
20 END ts("(zI1E
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或在提示符输入: jGo\_O<of
/[ft{:#&t
?"Hello, world!":END hN\sC9a1
PnB2a'(^@?
现代版BASIC(例如Quick BASIC): "3|OB, <;:
VR A+p?7-
Print "Hello, world!" {x[C\vZsi]
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以下的语句在Quick BASIC中同样有效: 1mR@Bh
j~>J?w9<O
? "Hello,world!" kA)`i`gt
]scr@e
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BCPL Snp(&TD<<
GET "LIBHDR" ,^ dpn
:f7vGO"t
LET START () BE @xso{$ z?j
$( tw.z5
WRITES ("Hello, world!*N") >IA1 \?(
$) %nE%^Enw
u6IM~kk>5
fA[T5<66
Befunge Z:V<