“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。 IyM:9=}5
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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》。 X3~`~J
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以下是用不同语言写成的Hello World程序的几个例子: Ug384RzHN
Ada %m|1LI(
with Ada.Text_Io; use Ada.Text_Io; QMy1!:Z&!
procedure Hello is [7 NO !^
begin QKhGEW~G
Put_Line ("Hello, world!");
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end Hello; +N'&6z0Wf
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汇编语言 KT17I&:
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x86 CPU,DOS,TASM CSz+cS
MODEL SMALL :F9Oj1lM%
IDEAL bkz/V/ Y
STACK 100H bcT'!:
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DATASEG jeB"j
HW DB 'Hello, world!$' qJ .XI
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CODESEG 5"(FilM
MOV AX, @data abCxB^5VL
MOV DS, AX CNhLp#
MOV DX, OFFSET HW Z>l<.T"t'
MOV AH, 09H FGhnK'
INT 21H A~^x*#q{4
MOV AX, 4C00H NNwGRoDco
INT 21H "{trK?-8%
END dpX Fx"4A
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x86 CPU,GNU/Linux,NASM mD|Q+~=|e
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). dK0H.|
;Enter this into "hello.asm" then type: _'<FBlIN
;"nasm -f elf hello.asm" 9p1@Lfbj
;"ld hello.o -o hello" >&k`NXS|V
;"./hello" $=`d[04
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section .data ;data section declaration (;H% r &
msg db 'Hello World!',0AH LFZ*mRiuKE
len equ $-msg ;string length _^`V0>Mh:
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section .text ;code section declaration z`NJelcuz\
global _start ;entry point (start of execution) Z3=N= xY]
_start: mov edx,len ;string length Wyow MFp
mov ecx,msg ;string start 7#Uzz"^
mov ebx,1 ;file handle: stdout Mvp|S.
mov eax,4 ;sys_write I$4>_D
int 80h ;kernel system call 'Sesh'2
/
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mov ebx,0 ;return value C\OZs%]At
mov eax,1 ;sys_exit %|1s9?h7\
int 80h ;kernel system call id" l"
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x86 CPU,Windows,MASM32 ]EUQMyR
.386 8EX?/33$
.model flat,stdcall lL
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option casemap:none 7%[ YX
;Include 文件定义 ] W$V#
include windows.inc !w@i,zqu
include user32.inc h%NM%;"H/
includelib user32.lib "@|rU4Y
include kernel32.inc t;-F]
includelib kernel32.lib X[f)0w%
;数据段 ~B?Wg!
.data 2$`Y 4b 3t
szCaption db 'A MessageBox!',0 p L^3*B.Nr
szText db 'Hello,world!',0 `M. I.Z_
;代码段 %<'.c9u5
.code 2?v }w<Ydl
start: FjLMN{eH/
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Xr'b{&
invoke ExitProcess,NULL jSRi
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end start HgBu:x?&
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BEGIN { print "Hello, world!" } s:(z;cj/
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BASIC 6V}xgfB
传统版BASIC(例如GWBASIC): ^".6~{
A zp!;+
10 PRINT "Hello, world!" ULgp]IS
20 END [hk/Rp7{
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或在提示符输入: ~jmI`X/
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?"Hello, world!":END [tElt4uG
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现代版BASIC(例如Quick BASIC): x8~*+ j
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Print "Hello, world!" i[ws%GfEv
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以下的语句在Quick BASIC中同样有效: Cud!JpL
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? "Hello,world!" m6]6!_
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BCPL wO`G_!W9
GET "LIBHDR" '
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LET START () BE UI%4d3
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