“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。 k4` %.;
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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》。 6p.y/LMO
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以下是用不同语言写成的Hello World程序的几个例子: c2]h.G83
Ada
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with Ada.Text_Io; use Ada.Text_Io; R''2o_F6
procedure Hello is T iJ \J{
begin KbH|'/w
Put_Line ("Hello, world!"); =>O{hT^F
end Hello; X<f4X"y
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汇编语言 Vygh|UEo
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x86 CPU,DOS,TASM f*^bV_
MODEL SMALL xFA`sAucr
IDEAL h|<;:o?yh
STACK 100H IU"8.(;o
7>EMr}f C
DATASEG Wxi;Tq9C@_
HW DB 'Hello, world!$' 5H(
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CODESEG <1`MjP*w
MOV AX, @data c57`mOe/b
MOV DS, AX rY$wC%
MOV DX, OFFSET HW _6L'}X$)N
MOV AH, 09H oq(W|
INT 21H X3y28 %R
MOV AX, 4C00H sBNqg~HwB?
INT 21H ~W3t(\B'
END 8sq0 BH
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8 v da"
x86 CPU,GNU/Linux,NASM aLwEz}-
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). EWWCh0
{
;Enter this into "hello.asm" then type: JZqJ&
;"nasm -f elf hello.asm" oMNBK/X_
;"ld hello.o -o hello" {<cgeH
;"./hello" KSUhB
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section .data ;data section declaration A>*#Nw5L
msg db 'Hello World!',0AH u_*y~1^0
len equ $-msg ;string length JQW7y!Z
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section .text ;code section declaration zJOyr"B'8
global _start ;entry point (start of execution) 9|K:\!7
_start: mov edx,len ;string length 0Cyus
mov ecx,msg ;string start Tq8U5#NF
mov ebx,1 ;file handle: stdout uTy00`1
mov eax,4 ;sys_write C @P$RVS
int 80h ;kernel system call D8b9T.[(
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mov ebx,0 ;return value 4OG1_6K
mov eax,1 ;sys_exit i\*
b<V
int 80h ;kernel system call %V(U]sbV
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x86 CPU,Windows,MASM32 s2#}@b6'.
.386 <co:z<^lqu
.model flat,stdcall *QoQ$alHH
option casemap:none ~Yre(8+M
;Include 文件定义 \3x+Z!
include windows.inc cxIAI=JK
include user32.inc z\K-KD{Ad
includelib user32.lib WqHp23
include kernel32.inc 1([?EfC
includelib kernel32.lib }#nd&ND
;数据段 ?O9|
.data S=$ \S9
szCaption db 'A MessageBox!',0 %)e&"mq!|
szText db 'Hello,world!',0 hF1Lj=x
;代码段 ]v_u2f'
.code (62Sc]
start: .pblI
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK l?HC-_Pbh
invoke ExitProcess,NULL u!McPM8Yk
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> <JW%h :\t
end start 7&Ie3[Rm_3
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BEGIN { print "Hello, world!" } Lv #}Gm
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BASIC D% 2S!
传统版BASIC(例如GWBASIC): B!J&=*=e
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10 PRINT "Hello, world!" [6nN]U~ Y
20 END \WZSY||C|_
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或在提示符输入: ~hT(uxU/
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?"Hello, world!":END )\{]4[9N
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现代版BASIC(例如Quick BASIC): v\5`n@}4
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Print "Hello, world!" JE;!~=
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以下的语句在Quick BASIC中同样有效: E.CG
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? "Hello,world!" eqyUI|e
= @ 1{LF;
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BCPL =r~ExW}+
GET "LIBHDR" zOis}$GR
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LET START () BE 35fj-J$8
$( Uf|@h
WRITES ("Hello, world!*N") rW*[sLl3
$) 2Xv$
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t]ID
Befunge 0 l+Jq
"!dlrow olleH">v !"
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, S]gV! Q4%
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Brainfuck D+Z2y1
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C "?'9\<>
#include <stdio.h> M|UCV_omN
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int main(void) ZUl-&P_X
{ ye4GHAm,p
printf("Hello, world!\n"); [u^~ND '
return 0; c+
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} $IJ"fs
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C++ Lv>O BHD
#include <iostream> h~ehZJys
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int main() aoGns46Y
{ <}}u'5;^?x
std::cout << "Hello, world!" << std::endl; *d-JAE
return 0; 4UMOC_
} ?',GR aD
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C++/CLI )c<[@::i
int main() QvlVjDIy
{ yL23Nqe
System::Console::WriteLine("Hello, world!"); JHJ]BMm
} 3.h0
m ~gc c
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C# (C Sharp) oKPG0iM:
class HelloWorldApp 8k^1:gt^
{ ~bgM*4GW
public static void Main() r<