“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。 ^' M>r(t
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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》。 V5F%_,No
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以下是用不同语言写成的Hello World程序的几个例子: /4\wn?f
Ada kX`[Y@nUN
with Ada.Text_Io; use Ada.Text_Io; ) 0 W`
procedure Hello is y
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begin :#~U<C@o
Put_Line ("Hello, world!"); $Xm6N@
end Hello; B~
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汇编语言 YKmsQ(q`N
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x86 CPU,DOS,TASM FGWN}&K
MODEL SMALL 1923N]b
IDEAL
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STACK 100H EtbnE*S
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DATASEG S"Lx%
HW DB 'Hello, world!$' j>uj=B@
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CODESEG tZ`Ts}\e
MOV AX, @data L( T12s
MOV DS, AX <JMcIV837
MOV DX, OFFSET HW >_OYhgs1w
MOV AH, 09H css64WX^0c
INT 21H 3>E%e!D%
MOV AX, 4C00H D8&`R
INT 21H
j~j jX
END -=s(l.?Hm5
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x86 CPU,GNU/Linux,NASM _Z5Mw+=19
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). \`V;z~@iA
;Enter this into "hello.asm" then type: 98=wnWX6$
;"nasm -f elf hello.asm" H ]4Hj
;"ld hello.o -o hello" (Yo>Oh4
;"./hello" RrUBpqA
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section .data ;data section declaration
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msg db 'Hello World!',0AH _@S`5;4x
len equ $-msg ;string length xGTP;NT_H
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section .text ;code section declaration `.s({/|[
global _start ;entry point (start of execution) t!Sq A(-V
_start: mov edx,len ;string length V%$/#sza
mov ecx,msg ;string start -*5Rnx|Y{
mov ebx,1 ;file handle: stdout .920{G?l5
mov eax,4 ;sys_write 8-<:i
int 80h ;kernel system call 0TpK#OlI|c
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mov ebx,0 ;return value `u>4\sv
mov eax,1 ;sys_exit {*{Ox[Nh{
int 80h ;kernel system call @(r/dZc
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x86 CPU,Windows,MASM32 ODZ|bN0>
.386 W9NX=gE4
.model flat,stdcall lHgs;>U$
option casemap:none Xpzfm7CB/
;Include 文件定义 cGjPxG;
include windows.inc McB[|PmC
include user32.inc 8@so"d2e
includelib user32.lib y;/VB,4V
include kernel32.inc (o3
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includelib kernel32.lib jKt7M>P
;数据段 Eke5Nb
.data 6Gf?m;
szCaption db 'A MessageBox!',0 2-Y<4'>
szText db 'Hello,world!',0 ;b-XWK=
;代码段 A}eOFu`
.code mI 74x3 [
start: SlsdqP
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK oudxm[/U
invoke ExitProcess,NULL [eTSZjIN7
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end start ~69&6C1Ch
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BEGIN { print "Hello, world!" } bhniB@<
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传统版BASIC(例如GWBASIC): ]+X@
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10 PRINT "Hello, world!" -GxaV #{
20 END m *JaXa
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或在提示符输入: UX7t`l2R
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?"Hello, world!":END 5oAK8I
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现代版BASIC(例如Quick BASIC): Y]&j,j&
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Print "Hello, world!" (+0v<uR^D
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以下的语句在Quick BASIC中同样有效: =>-Rnc@
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? "Hello,world!" -B +4+&{T
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BCPL !r<pmr3f@7
GET "LIBHDR" =E.wv
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LET START () BE E>K!Vrh-L
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WRITES ("Hello, world!*N") {;2PL^i
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#include <stdio.h> tS6qWtE
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int main(void) M!o##* *`
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printf("Hello, world!\n"); LcTP#
return 0; #"G]ke1l$
} lgk.CC
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C++ LU!a'H'Q
#include <iostream> vQ
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int main() 1ukTA@Rj&
{ EFM5,gB.m
std::cout << "Hello, world!" << std::endl; YpVD2.jy
return 0; T{-CkHf9Q
} ~UP[A'9jJ
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C++/CLI VZKvaxIk6
int main() gi1^3R[
{ .[ICx
System::Console::WriteLine("Hello, world!"); 1G^`-ri6
} Hquc
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C# (C Sharp) X aMJDa|M
class HelloWorldApp 3`DQo%<
{ g,!L$,/F
public static void Main() VAHh~Q6 ;e
{ 5@~
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System.Console.WriteLine("Hello, world!"); V2wb%;q
} X}Ai-D
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IDENTIFICATION DIVISION. Yi.N&