“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。 s8h-,@p
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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》。 C/-63O_
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以下是用不同语言写成的Hello World程序的几个例子: 9 '2_
Ada RH|XxH*
with Ada.Text_Io; use Ada.Text_Io; b4pm_Um
procedure Hello is p*P)KP
begin 1u9LdkhnY
Put_Line ("Hello, world!"); 'f?$"U JF
end Hello; >&U,co$>
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汇编语言 ;"m ,:5%
tq|hPd<C
x86 CPU,DOS,TASM j.@\3'
MODEL SMALL DX|#
gUAm
IDEAL f1(+
bE%
STACK 100H VZl6t;cn
0xXC^jx:
DATASEG lO_UPC\@fw
HW DB 'Hello, world!$' xagBORg+Bd
UMcgdJB
CODESEG qZA).12qS
MOV AX, @data L:'J
Bhg
MOV DS, AX LoGVwRmoC
MOV DX, OFFSET HW v@d
MOV AH, 09H `9b7>Nn<
INT 21H (/j); oSK
MOV AX, 4C00H wg]j+r@
INT 21H \R;`zuv
END 6}oXP_0U
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x86 CPU,GNU/Linux,NASM 9,r rQQD_
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). |1>*;\o-
;Enter this into "hello.asm" then type: X<%Q"2hW
;"nasm -f elf hello.asm" k'5?M
;"ld hello.o -o hello" L~NbdaO
;"./hello" WpRc)g:
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section .data ;data section declaration 6<ZkJ:=
msg db 'Hello World!',0AH
MEGv}
len equ $-msg ;string length O~^"
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section .text ;code section declaration n0e1k.A
global _start ;entry point (start of execution) ]h5Yg/sms
_start: mov edx,len ;string length 9& 83n(m
mov ecx,msg ;string start GJqJlgHe
mov ebx,1 ;file handle: stdout \0f{S40
mov eax,4 ;sys_write s=QAO!aw
int 80h ;kernel system call i0$kit
ZXuv CI
mov ebx,0 ;return value ~'CE[G5
mov eax,1 ;sys_exit XUlS\CH@{
int 80h ;kernel system call Uh):b%bS;J
fk x \=
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x86 CPU,Windows,MASM32 =^5Alba/
.386 KW^7H
.model flat,stdcall y;o^- O
option casemap:none Bjz Pz
;Include 文件定义 6Z%U`,S
include windows.inc sU{NHC)5
include user32.inc vsl]92xI
includelib user32.lib x"
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include kernel32.inc :FTMmW,>'
includelib kernel32.lib eF3,2DDC
;数据段 {>)#HD
.data G8Y<1%`<
szCaption db 'A MessageBox!',0 % V8U(z
szText db 'Hello,world!',0 uD@#
;代码段 lH6OcD:kj
.code n@,G8=J?
start: e8#h3lxJ`
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK
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invoke ExitProcess,NULL L|}lccpI
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> \hEN4V[
end start o_^?n[4
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AWK O2%?
BEGIN { print "Hello, world!" } De(Hw&
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BASIC S_IUV)
传统版BASIC(例如GWBASIC): D,k"PaLP
Y/ .Z.FD`
10 PRINT "Hello, world!" RpD=]y!5_
20 END T"DlT/\
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或在提示符输入: --c"0,7
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?"Hello, world!":END gh8F2V;<
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现代版BASIC(例如Quick BASIC): "$N+"3I
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Print "Hello, world!" .w8J*JZ
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以下的语句在Quick BASIC中同样有效: wlqpn(XR
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? "Hello,world!" 283F)T\Rv
s pp f
~2QR{; XQ
BCPL }%_ b$
GET "LIBHDR" \}"$ ?d'f
~U@;gLoD
LET START () BE n4R(.N00
$( io-![^{
WRITES ("Hello, world!*N") LH8 fBhw
$) )]H-BIuGm
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B=^)Ub5'
Befunge ov_j4j>6P
"!dlrow olleH">v [8=vv7wS
, ? -dX`n
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