“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。 Ji SJi?
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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》。 7g3vh%G.
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以下是用不同语言写成的Hello World程序的几个例子: I&|%Fn
Ada K2<Q9 ,vt
with Ada.Text_Io; use Ada.Text_Io; aG QC
procedure Hello is :0ZFbIy
begin P:&XtpP
Put_Line ("Hello, world!"); |4BS\fx~N
end Hello; siw }
}}
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汇编语言 V%?oI]"
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x86 CPU,DOS,TASM )BudV zg
MODEL SMALL 7{j9vl6
IDEAL /02|b}{
STACK 100H S nVIV%
#(-V^T
DATASEG u|ia
HW DB 'Hello, world!$' xlF$PpRNM
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CODESEG o~H4<ayy
MOV AX, @data 8D[P*?O
MOV DS, AX N~L3
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MOV DX, OFFSET HW s%"3F<\
MOV AH, 09H qczGv2%!
INT 21H :
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MOV AX, 4C00H \;&9h1?Mn
INT 21H A 1x?_S"a
END <*0^X%Vf\
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x86 CPU,GNU/Linux,NASM =7ul,
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). fb[f >1|
;Enter this into "hello.asm" then type: &'9 Jy'(X
;"nasm -f elf hello.asm" a) GLz
;"ld hello.o -o hello" *A.E?9pL\
;"./hello" D
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section .data ;data section declaration ]&w>p#_C
msg db 'Hello World!',0AH si,fs%D&
len equ $-msg ;string length '`=z52
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section .text ;code section declaration -qz;
global _start ;entry point (start of execution) v|`f8M2
_start: mov edx,len ;string length R"#DR^.;
mov ecx,msg ;string start 5an#,vCn{
mov ebx,1 ;file handle: stdout ENm\1
mov eax,4 ;sys_write :%Na-j9hV)
int 80h ;kernel system call >t')ZSjRs
:<f7;.
mov ebx,0 ;return value K?:rrd=7q
mov eax,1 ;sys_exit ST1PSuC~
int 80h ;kernel system call _x_om#~n
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x86 CPU,Windows,MASM32 tKgPKWP
.386 =z^v)=uhp
.model flat,stdcall 7H~StdL/>
option casemap:none i]!CH2\
;Include 文件定义 `=^;q6f
include windows.inc 8?!=/Sc
include user32.inc T:IKyb
includelib user32.lib -Wc'k 2oU
include kernel32.inc 5xL%HX[S
includelib kernel32.lib 5CH9m[S
;数据段 #jn6DL@[{
.data !7t,(Id8
szCaption db 'A MessageBox!',0 ]}H;`H
szText db 'Hello,world!',0 ,5Jq
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;代码段 &PWz4hZ
.code k/hE68<6i
start:
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK qwJeeax
invoke ExitProcess,NULL 0G?0 Bo
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> /H&:
end start )MqF~[k<-
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AWK #R v&b@K
BEGIN { print "Hello, world!" } R4v)}`x
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BASIC YFgQ!\&59
传统版BASIC(例如GWBASIC): OnFx8r:q@%
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10 PRINT "Hello, world!" pH5"g"e1
20 END vk:@rOpl
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或在提示符输入: Cp(,+dD
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?"Hello, world!":END o\u31,
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现代版BASIC(例如Quick BASIC): \hv1"WaJ
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Print "Hello, world!" J&4LyIpQ
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以下的语句在Quick BASIC中同样有效: MFO}E!9`q
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? "Hello,world!" Vvu+gP'z.
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BCPL TWE$@/9 )g
GET "LIBHDR" C^I h"S
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LET START () BE `P}T{!P+6
$( %cJ]Ds%V
WRITES ("Hello, world!*N") @q2If{Tk
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Befunge ~t\Hb8o
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+++++++++++++++.>.+++.------.--------.>+.>. A;Rr#q<
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C ^50#R<Ny
#include <stdio.h> }TD$!
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int main(void) tn};[r
{ K|
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printf("Hello, world!\n"); CI$pPY<u1
return 0; fbp6lE
} Av[L,4A
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C++ %m r
#include <iostream> \AV6;;}&
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int main() Z=`\U?,
{ }wzU<(Rx
std::cout << "Hello, world!" << std::endl; Z{nJ\`
return 0; RkP g&R;i
} v
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C++/CLI ;i|V++$_
int main() Y%OE1F$6NN
{ TGx:#x*k
System::Console::WriteLine("Hello, world!"); @4dB$QF`&
} odAeBQy
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C# (C Sharp) Zn&S7a>7
class HelloWorldApp X]d["
{ mf]1mG})
public static void Main() 51 3{oM:
{ |KFRC)g
System.Console.WriteLine("Hello, world!"); >en,MT|
} Yy]^_,r
} D/pc)3Ofe
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COBOL Z!o&};_j
IDENTIFICATION DIVISION. \9*wo9cV
PROGRAM-ID. HELLO-WORLD. ImQ?<g8$
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ENVIRONMENT DIVISION. ++ !BSQ e
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DATA DIVISION. ~ldqg2c
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PROCEDURE DIVISION. +BcJHNIB
DISPLAY "Hello, world!". v#i,pBj
STOP RUN. 2OFrv=F
.} <$2.
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Common Lisp aV3:wp]Gn
(format t "Hello world!~%") `PK1zSr
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DOS批处理 "C 7-^R#
@echo off m }I@:s2
echo "Hello, world!" HSEfpbh
L2:v#c()#)
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Eiffel _r0[ z
class HELLO_WORLD 6FuZMasr*
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creation
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make qTFktJZw
feature G/ToiUY
make is ??Zh$^No:
local Nb/W+& y
io:BASIC_IO f,{O%*PUA
do E'qGK T
!!io >g8H
io.put_string("%N Hello, world!") CC,_I>t
end -- make :^".cs?g
end -- class HELLO_WORLD IfF@$eO
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`!{m#BBT}
Erlang K~Lh'6
-module(hello). R5=2EwrGP
-export([hello_world/0]). A?I/[zkc
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hello_world() -> io:fwrite("Hello, World!\n"). 5*QNE!
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R B7?T5G
Forth 92g#QZs&W
." Hello, world!" CR nRq@hk
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Fortran \]pRu"
WRITE(*,10) ;ew j
10 FORMAT('Hello, World!') <:=}1t.Z
STOP !qe,&