“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。 %KhI>O<
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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》。 H?vdr:WlTN
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以下是用不同语言写成的Hello World程序的几个例子: v\gLWq'
Ada {j?FNOJn
with Ada.Text_Io; use Ada.Text_Io; %9F([K
procedure Hello is DFB@O|JL
begin kW Ml
Put_Line ("Hello, world!");
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end Hello; )9{0]u;9
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汇编语言 \O3m9,a
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x86 CPU,DOS,TASM >=I|xY,
MODEL SMALL 2/\r)$
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IDEAL X;
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STACK 100H A@!qv#'
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DATASEG *e TqVG.
HW DB 'Hello, world!$' {0Yf]FQb-a
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CODESEG ["k,QX
MOV AX, @data B[Ku\A6&
MOV DS, AX ,i?nWlh+
MOV DX, OFFSET HW %A9NB!
MOV AH, 09H ~zJbK. _
INT 21H m{Wu"
;e
MOV AX, 4C00H ?4#Li~q
INT 21H F3[T.sf
END L2[($l
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x86 CPU,GNU/Linux,NASM g#pr yYz
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ed{ -/l~j
;Enter this into "hello.asm" then type: 5K1)1E/Fu
;"nasm -f elf hello.asm" ~OYiq}g
;"ld hello.o -o hello" Af~$TyX
;"./hello" ~|DUt
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section .data ;data section declaration Ytp(aE:
msg db 'Hello World!',0AH !7O+ogL
len equ $-msg ;string length }<0BX \@I
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section .text ;code section declaration _2Zx?<] 2E
global _start ;entry point (start of execution) 2. NN8PPD"
_start: mov edx,len ;string length 64
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mov ecx,msg ;string start hE'-is@7
mov ebx,1 ;file handle: stdout &.)^
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mov eax,4 ;sys_write ^,lIK+#Elz
int 80h ;kernel system call ]Grek<
lne4-(DJ
mov ebx,0 ;return value pGP7nw_g
mov eax,1 ;sys_exit 8rAg\H3E
int 80h ;kernel system call ?um;s-x)
!]A
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x86 CPU,Windows,MASM32 #X+JHl
.386 L81ZbNU?$
.model flat,stdcall {K~ 'K+TPu
option casemap:none GLH0 ]
;Include 文件定义 f <Zxz9
include windows.inc
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include user32.inc <yV"6/l0
includelib user32.lib F/,NDZN
include kernel32.inc #ZUI)9My@
includelib kernel32.lib *?@?f&E/
;数据段 ozyX$tp
.data Co9^OF-k
szCaption db 'A MessageBox!',0 OR P\b
szText db 'Hello,world!',0 Fk&c=V;SU
;代码段 W<h)HhyG
.code np|Sy;:
start: Q^P}\wb>
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK |MTnH/|
invoke ExitProcess,NULL ?.m bK
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> x;O[c3I
end start &N$<e(K
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BEGIN { print "Hello, world!" } GhAlx/K
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BASIC RXMISt3+{y
传统版BASIC(例如GWBASIC): (!u~CZ;
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10 PRINT "Hello, world!" etDk35!h~,
20 END 7DogM".}~Q
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或在提示符输入: AG
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?"Hello, world!":END *}qWj_RT
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现代版BASIC(例如Quick BASIC): ]"As1"
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Print "Hello, world!" wQl
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以下的语句在Quick BASIC中同样有效: 'T;P;:!\
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? "Hello,world!" ='r!g
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GET "LIBHDR" w>&aEv/f
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LET START () BE S"QWB`W2
$( m]0;"jeL
WRITES ("Hello, world!*N") fCn^=8KOZ
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Befunge mfn,Gjt3O
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Brainfuck &vMb_;~B
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< !X#OOqPr=
+++++++++++++++.>.+++.------.--------.>+.>. Yx%Hs5}8
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C FIhk@TKa
#include <stdio.h> qOtgve`jX
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int main(void) DU'`ewLL7
{ s?}e^/"v
printf("Hello, world!\n"); ;7V%#-
return 0; nPl?K:(
} b94DJzL1z
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C++ 0RLg:SV
#include <iostream> Qbn"=n2
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int main() dn+KH+v
{ Om\vMd@!
std::cout << "Hello, world!" << std::endl; *vxk@`K~
return 0; =s2*H8]
} k$R-#f;
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C++/CLI `?_Q5lp/s
int main() zP8lN(LA
{ JIOR4' 9
System::Console::WriteLine("Hello, world!"); WiR(;m<g
} 0@iY:aF
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C# (C Sharp) kfY}S
class HelloWorldApp 6iE<T&$3P
{ IK=a*}19L
public static void Main() 7*A],:-q
{ { @{']Y
System.Console.WriteLine("Hello, world!"); k2tF}
} @,7GaK\
} ag[wdoj
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COBOL ,j_i?Ff
IDENTIFICATION DIVISION. CxW>~O:
PROGRAM-ID. HELLO-WORLD. ZG8DIV\D7
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ENVIRONMENT DIVISION. O;jrCB
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DATA DIVISION. Z0", !6nS
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PROCEDURE DIVISION. Q\7h`d%)
DISPLAY "Hello, world!". 'S&zCTX7j
STOP RUN. s-Tv8goNV
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Common Lisp 2eY_%Y0
(format t "Hello world!~%") ;'@9[N9
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DOS批处理 }9OC,Y8?D
@echo off y?? XIsF
echo "Hello, world!" })Vi
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Eiffel &B1Wt