“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。 N{!i=A
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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》。 1ba~SHi
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以下是用不同语言写成的Hello World程序的几个例子: QO:!p5^:
Ada /{J4:N'B>
with Ada.Text_Io; use Ada.Text_Io; rBzuKQK}J
procedure Hello is rgQOj^xKv^
begin ,2oWWsC7
Put_Line ("Hello, world!"); C3f' {}
end Hello; ! I:%0D
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汇编语言 e)k9dOR
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x86 CPU,DOS,TASM nc29j_Id
MODEL SMALL e2Pcm_Ahv*
IDEAL D/gw .XYL
STACK 100H .hb:s,0mP
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DATASEG C
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HW DB 'Hello, world!$' Qy<P463A(l
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CODESEG ~vhE|f
MOV AX, @data BwEN~2u6
MOV DS, AX O:R*rJ
MOV DX, OFFSET HW ,8uqdk-D
MOV AH, 09H s\(k<Ks
INT 21H |^I0dR/w:
MOV AX, 4C00H gs[uD5oo<
INT 21H %wg-=;d4
END &t@jl\ND
S3 %FHS
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x86 CPU,GNU/Linux,NASM \:'/'^=#|
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Rok7n1gW
;Enter this into "hello.asm" then type: UgSB>V<?
;"nasm -f elf hello.asm" Xl{P8L
;"ld hello.o -o hello" HRCT}
;"./hello" 558V_y:
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section .data ;data section declaration ~W'{p
msg db 'Hello World!',0AH 9L?.m&
len equ $-msg ;string length 8 >EWKI9
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section .text ;code section declaration =o(5_S.u;
global _start ;entry point (start of execution) XEp{VC@=
_start: mov edx,len ;string length ^mDe08.
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mov ecx,msg ;string start gfd"v
mov ebx,1 ;file handle: stdout g)[V(yWu
mov eax,4 ;sys_write rU:`*b<
int 80h ;kernel system call /t57!&
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mov ebx,0 ;return value kCF>nt@
mov eax,1 ;sys_exit dq6m>;`
int 80h ;kernel system call _/$Bpr{R
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x86 CPU,Windows,MASM32 sf
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.model flat,stdcall k,6f
option casemap:none jD]~ AwRJ
;Include 文件定义 N^G
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include windows.inc IqHV)A
include user32.inc x"=f+Mr
includelib user32.lib wk D^r(hiH
include kernel32.inc r'r%w#=`t
includelib kernel32.lib jXx<`I+]
;数据段 Yui3+}Ms
.data F#Ryu~,"
szCaption db 'A MessageBox!',0 3{64 @s
szText db 'Hello,world!',0 #4%]o%.
;代码段 O,
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.code K(rWNO
start: _ QI\
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 9';JXf$
invoke ExitProcess,NULL G@\1E+Ip
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end start BwGfTua
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BEGIN { print "Hello, world!" } X1|njJGO1
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BASIC ~9]hV7y5C
传统版BASIC(例如GWBASIC): w~A{(-
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10 PRINT "Hello, world!" t;Sb/ 3
20 END Pb4X\9^
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或在提示符输入: +b<FO+E_
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?"Hello, world!":END _\G"9,)u'
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现代版BASIC(例如Quick BASIC): nZyX|SPk
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Print "Hello, world!" Q5`*3h6p=
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以下的语句在Quick BASIC中同样有效: <tNBxa$gS
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? "Hello,world!" y/cvQY0pU
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GET "LIBHDR" @Z
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LET START () BE 4N_R:B-Vu
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WRITES ("Hello, world!*N") +H-6e P
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Befunge W)2p@j59A
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#include <stdio.h> Eqd<