“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。 #l# [\6
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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》。 ID# qKFFW
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以下是用不同语言写成的Hello World程序的几个例子: j%jd@z ]@
Ada O&iYGREO
with Ada.Text_Io; use Ada.Text_Io; G D{fXhgk
procedure Hello is kDY]>v
begin a9zph2o-
Put_Line ("Hello, world!"); x9A
ZS#e)[
end Hello; zN/~a)
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% 3-\3qx*
汇编语言 '8kjTf#g<l
Sx9:$"3.X
x86 CPU,DOS,TASM I{e^,oc
MODEL SMALL :;q_f+U
IDEAL .y9rM{h}b
STACK 100H Fi%W\Y'
~Z6p3#
!o
DATASEG
I S8nvx\
HW DB 'Hello, world!$' u;ooDIq@
F%Umau*1
CODESEG =z1o}ga=EA
MOV AX, @data 3(})uV
MOV DS, AX f\_!N
"HW
MOV DX, OFFSET HW ec4%Wk2
MOV AH, 09H LYg$M@
INT 21H J:Y|O-S!
MOV AX, 4C00H emY5xZ@N
INT 21H -s%-*K+,W
END 3J~kiy.nfW
C=aj&
fMEv85@JL
x86 CPU,GNU/Linux,NASM aU<D$I
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). *8X9lv.Z
;Enter this into "hello.asm" then type: qvU$9cTY
;"nasm -f elf hello.asm"
G<-9U}~76
;"ld hello.o -o hello" >l< ~Z;
;"./hello" ElR&scXi__
+<WRB\W
section .data ;data section declaration NU&^7[!yl
msg db 'Hello World!',0AH KR+BuL+L
len equ $-msg ;string length 4B8S e
1;kG[z=A
section .text ;code section declaration PBww
global _start ;entry point (start of execution) pY!dG-;
_start: mov edx,len ;string length |8qK%n f}
mov ecx,msg ;string start u~- fK'/!|
mov ebx,1 ;file handle: stdout QB3d7e)8>
mov eax,4 ;sys_write h9BD
^j
int 80h ;kernel system call a;'E}b{`F
r;on0wm&B
mov ebx,0 ;return value .1}rzh}8
mov eax,1 ;sys_exit x"llX
int 80h ;kernel system call g[wP!y%V
opcR~tg@r
DPS1GO*
x86 CPU,Windows,MASM32 J={OOj
.386 iPY vePQ
.model flat,stdcall <m/b]|
option casemap:none _{*$>1q
;Include 文件定义 @6YBK+"
include windows.inc Pm#x?1rAj
include user32.inc ~r>EF!U`h
includelib user32.lib tk)>CK11
include kernel32.inc #ON#4WD?
includelib kernel32.lib 3aE[F f[
;数据段 }]g95xT
.data jQxPOl$-
szCaption db 'A MessageBox!',0 ,hTwNVWI9
szText db 'Hello,world!',0 '6.>Wdd
;代码段 VU`z|nBW@
.code mzV"G>,o
start: /,Dwu?Lcqp
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK uVq5fT`B
invoke ExitProcess,NULL eC^0I78x
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 2c"N-c&A
end start H#|Z8^ *Ds
A
eGG
KI Plb3oh
AWK TvWU[=4Yk
BEGIN { print "Hello, world!" } +\k9w.[:/
.kbr?N,'
0/SC
BASIC *qO]v9 j
传统版BASIC(例如GWBASIC): i{|lsd(+
BbXU|QtY
10 PRINT "Hello, world!" dI_r:xN
20 END Iu-'o
;h,R?mU
或在提示符输入: 65waq~#
uP(B<NfL:'
?"Hello, world!":END J)$&