“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。 5{[3I|m{
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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》。 |4x&f!%m
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以下是用不同语言写成的Hello World程序的几个例子: xL=g(FN(6L
Ada U~!97,|ic
with Ada.Text_Io; use Ada.Text_Io; FxD\F
procedure Hello is uWv l<{2
begin nakhepLN
Put_Line ("Hello, world!"); uA*Op45
end Hello; N{L ]H_=
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汇编语言 J rYpZ.Nh
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x86 CPU,DOS,TASM ZO
W{rv]
MODEL SMALL -GH#nF3G
IDEAL Xl@nv9m
STACK 100H "JbFbcj
:G$NQ*(z
DATASEG l{_>?]S5
HW DB 'Hello, world!$' g}L2\i688
;{j:5+'
CODESEG K\,&wU
MOV AX, @data ex&&7$CXc
MOV DS, AX MoO
jM&9
MOV DX, OFFSET HW pJK puoiX
MOV AH, 09H NJLU+byU
INT 21H d #y{eV$Q
MOV AX, 4C00H ^5QSV\X
INT 21H VCkhK9(N
END h:Npi
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x86 CPU,GNU/Linux,NASM nYTI\f/8v
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). =r:D]?8oC
;Enter this into "hello.asm" then type: f+-w~cN
;"nasm -f elf hello.asm" YdhrFw0`~r
;"ld hello.o -o hello" /M\S^!g@
;"./hello" {(7C=)8):
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section .data ;data section declaration 8!S="_
msg db 'Hello World!',0AH n[AJ'A{
len equ $-msg ;string length ZsNUT4
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section .text ;code section declaration ;'p X1T
global _start ;entry point (start of execution) 8 mV`|2>
_start: mov edx,len ;string length >=r094<
mov ecx,msg ;string start aG`G$3 _wx
mov ebx,1 ;file handle: stdout ) l0=jb
mov eax,4 ;sys_write FwmE1,
int 80h ;kernel system call on\0i{0l8
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mov ebx,0 ;return value ZWh:&e(
mov eax,1 ;sys_exit .'L@$]!G
int 80h ;kernel system call a~:'OW:Q
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x86 CPU,Windows,MASM32 Xp4pN{h e
.386 rqT@i(i
.model flat,stdcall #eR*|W7o
option casemap:none _lu.@IX-
;Include 文件定义 GriL< =?t
include windows.inc `cMa Fc-y/
include user32.inc ^A;v|U
includelib user32.lib b"/P
include kernel32.inc [;h@q}
includelib kernel32.lib - "h
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;数据段 mY
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.data ~,m6g&>R
szCaption db 'A MessageBox!',0 q@r8V&-<
szText db 'Hello,world!',0 m:ITyQ+
;代码段 z*I=
.code r#d~($[93
start: \62|w HX
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK OI::0KOv
invoke ExitProcess,NULL "e@JMS
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> $NT{ssh
end start NcB^qv
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BEGIN { print "Hello, world!" } KR?-<
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BASIC dHg[0Br)r
传统版BASIC(例如GWBASIC): f* p=]]y
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10 PRINT "Hello, world!" Y{f;qbEQH'
20 END $
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或在提示符输入: 4B^f"6'
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?"Hello, world!":END 6psK2d0
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现代版BASIC(例如Quick BASIC): "N D1$l
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Print "Hello, world!" P)7SK&]r;=
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以下的语句在Quick BASIC中同样有效: A@f`g[q
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? "Hello,world!" jaFBz&P/#
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BCPL #L`@["
GET "LIBHDR" A)/_:
QUH USDT
LET START () BE <t.yn\G-w
$( m!tB;:6
WRITES ("Hello, world!*N") P!0uAkt9C
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Befunge 0\k2F,:%4
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Brainfuck Zb^0EbV
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+++++++++++++++.>.+++.------.--------.>+.>. a>ZV'~zTf
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#include <stdio.h> hDSt6O4za
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int main(void) g;UB+Y 247
{ d3St Z~&r!
printf("Hello, world!\n"); `!K(P- yB?
return 0; Xt_8=Q
} x32hO;
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C++ OT+=H)/
#include <iostream> P>9F(#u_(F
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int main() L 1H!o!*
{ pW 2NrBq@w
std::cout << "Hello, world!" << std::endl; b>er 'U
return 0; U_K"JOZ
} nxS|]
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C++/CLI W_Z%CBjcT
int main() sC(IeGbX
{ $^?Mip
System::Console::WriteLine("Hello, world!"); Y[R veF
} zn@<>o8hU
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C# (C Sharp) +vIpt{733
class HelloWorldApp anxgD?<+B
{ I}q2)@
public static void Main() @@-n/9>vs
{ jAie[5
System.Console.WriteLine("Hello, world!"); MX2]Q
} lA<n}N)j
} ; :4&nJ*qG
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