“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。 swG!O}29OX
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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》。 n{xL1A=9
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以下是用不同语言写成的Hello World程序的几个例子: "$PX[:
Ada $;B0x
with Ada.Text_Io; use Ada.Text_Io; !s(s^
procedure Hello is \Culf'iX
begin JG=z~ STz
Put_Line ("Hello, world!"); {[[/*1r|
end Hello; zfm#yDf
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汇编语言 @;h$!w<
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x86 CPU,DOS,TASM f"0?_cG{%
MODEL SMALL OQh4MN#$
IDEAL XJZS}Z7h
STACK 100H z9HUI5ns
v?`DP
DATASEG xc_-1u4a9
HW DB 'Hello, world!$' TV*@h2C"i
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CODESEG
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MOV AX, @data "i~~Q'=7
MOV DS, AX v_NL2eQ~
MOV DX, OFFSET HW #lO~n.+P
MOV AH, 09H ) (l=_[1Z5
INT 21H ~?uch8H
MOV AX, 4C00H &T\,kq>)
INT 21H 0'~Iv\s
END w4j,t
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x86 CPU,GNU/Linux,NASM _/cL"Wf
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). \Ea(f**2B
;Enter this into "hello.asm" then type: T/TMi&:?.
;"nasm -f elf hello.asm" i[m-&
;"ld hello.o -o hello" }g_\?z3gt
;"./hello" 9hdz<eFL
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section .data ;data section declaration s!WI:E7
msg db 'Hello World!',0AH y\c-I!6>26
len equ $-msg ;string length <F-W fR
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section .text ;code section declaration ?$ 0t @E
global _start ;entry point (start of execution) v7G&`4~
_start: mov edx,len ;string length l[M?"<Ot;
mov ecx,msg ;string start Gey j`t
mov ebx,1 ;file handle: stdout sL\W6ej
mov eax,4 ;sys_write (K3eb
int 80h ;kernel system call ^ 9 FRI9?
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mov ebx,0 ;return value %M
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mov eax,1 ;sys_exit l|5;&(Y+s
int 80h ;kernel system call 6>j0geFyE2
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x86 CPU,Windows,MASM32 FFpG>+*3
.386 R>dd#`r"
.model flat,stdcall Vc$y^|=
option casemap:none ^=7XA894
;Include 文件定义 !TeI Jm/l
include windows.inc R&9Q#n-
include user32.inc OGn-~
#E
includelib user32.lib !\/J|~XZ
include kernel32.inc G2!J`}
includelib kernel32.lib eD?f|bif
;数据段 &AhkP=Yw
.data zHk7!|%Y
szCaption db 'A MessageBox!',0 U['|t<^uf
szText db 'Hello,world!',0 hLF ;MH@
;代码段 B):hm
.code Ym$=^f]-
start: y$U(oIU>
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ?"L ^0%
invoke ExitProcess,NULL `F4gal^ ^
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end start 9jW"83*5
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BEGIN { print "Hello, world!" } [LDY;k~5+
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BASIC 0*XCAnJ^_
传统版BASIC(例如GWBASIC): D2MWrX
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10 PRINT "Hello, world!" a+PVi
20 END K | '`w.
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或在提示符输入: j6DI$tV~
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?"Hello, world!":END 2C"[0*.[N
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现代版BASIC(例如Quick BASIC): v]X*(e
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Print "Hello, world!" xvTz|Y
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以下的语句在Quick BASIC中同样有效: NGVl/Qd
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? "Hello,world!" (fcJp)D
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BCPL SmVL?wf
GET "LIBHDR" Q%n$IQr4gM
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LET START () BE tzrvIVD
$( V2LvE.Kj
WRITES ("Hello, world!*N") !8OgaMngzF
$) }) Zcw1g
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Befunge /MZ^;XG
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Brainfuck 1"UHe*2
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#include <stdio.h> {3!E8~
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int main(void) '^%k TNn
{ cV:Ak~PKl
printf("Hello, world!\n"); |&U{
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return 0; 2B"&WKk
} ~}RfepM
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C++ ZY=a[K
#include <iostream> I`;SA~5
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int main() v-DZW,
{ Fs&r^ [/b
std::cout << "Hello, world!" << std::endl; t ^~Qv
return 0; XeX`h_
} uYC1}Y5N
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C++/CLI n50WHlMtt
int main() :B:6ezDF6
{ DB3qf>@?
System::Console::WriteLine("Hello, world!"); nM|F
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} ~3Y4_b5E
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C# (C Sharp) tmi)LRF
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class HelloWorldApp w|c200Is}e
{ iF
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public static void Main() mM.YZUX
{ Ug\$Ob5=q
System.Console.WriteLine("Hello, world!"); !<?<f
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} <.&84c]/&
} ?!y<%&U
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COBOL n x{MUN7
IDENTIFICATION DIVISION. 8QMib3p
PROGRAM-ID. HELLO-WORLD. VS@e[,
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ENVIRONMENT DIVISION. <iB5&
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DATA DIVISION. b8E7/~<z3
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PROCEDURE DIVISION. k$ b)
DISPLAY "Hello, world!".
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STOP RUN. 'qJ0338d#U
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Common Lisp |-L7qZu%
(format t "Hello world!~%") ^h^.;Iqr=
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DOS批处理 HoK+g_9~
@echo off N&