“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。 rIcgf1v70
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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》。 ub~ t}
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以下是用不同语言写成的Hello World程序的几个例子: A1+:y,wXs
Ada A(E}2iP9=
with Ada.Text_Io; use Ada.Text_Io; 3{?X>6T
procedure Hello is s2SV
begin y4h
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Put_Line ("Hello, world!"); $rcv@-l
end Hello; ;K\2/"$QD
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汇编语言 1k4\zVgi
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x86 CPU,DOS,TASM B;(U?gC
MODEL SMALL 1Y $%| `
IDEAL ,Kj>F2{
STACK 100H Gh=I2GSo
Jk(V ]
DATASEG /Z:NoTGn
HW DB 'Hello, world!$' KF+r25uy[+
aUEr& $
CODESEG ,b!D8{W"N
MOV AX, @data uthW
AT &
MOV DS, AX AE~a=e\x
MOV DX, OFFSET HW i8e*9;4@
MOV AH, 09H T{Xd >
INT 21H P1rjF:x[*
MOV AX, 4C00H o{#aF=`{
INT 21H ?V!5VHa
END P'tXG
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x86 CPU,GNU/Linux,NASM P*iC#w]m
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). bI:W4y>I=
;Enter this into "hello.asm" then type: G3^<l0?S
;"nasm -f elf hello.asm" |3e+ K.
;"ld hello.o -o hello" l%_K$$C
;"./hello" $aJ6i7C,j}
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section .data ;data section declaration <<?32r~
msg db 'Hello World!',0AH o=7,U/{D!
len equ $-msg ;string length 6ScB:8M
GB Yy^wjU
section .text ;code section declaration ph5{i2U0
global _start ;entry point (start of execution) N`efLOMl]
_start: mov edx,len ;string length M;y*`<x
mov ecx,msg ;string start zJy=1r
mov ebx,1 ;file handle: stdout YdO*5Gb6
mov eax,4 ;sys_write tWy.Gz\
int 80h ;kernel system call pt.V^a
[nig^8
mov ebx,0 ;return value ?}8r h%
mov eax,1 ;sys_exit Jg=!GU/::
int 80h ;kernel system call "!zJQl@
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x86 CPU,Windows,MASM32 TSewq4`K
.386 9qCE{[(
.model flat,stdcall m_0y ]RfG
option casemap:none .8s-)I
;Include 文件定义 f#:3TJV
include windows.inc \:{K",2
include user32.inc YOLzCnI4
includelib user32.lib uT,i&
include kernel32.inc [5L?#Y
includelib kernel32.lib 1-E6ACq
;数据段 i,ZEUdd*_
.data 2k<#e2
szCaption db 'A MessageBox!',0 7OmT^jV2
szText db 'Hello,world!',0 >R]M:Wx
;代码段 4@fv%LOQo
.code .%n_{ab1
start:
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK v}u]tl$,
invoke ExitProcess,NULL !0?o3,of-
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ^7+;XUyg
end start fdKE1,;
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BEGIN { print "Hello, world!" } ZT!8h$SE:
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BASIC AA[1[
传统版BASIC(例如GWBASIC): N8Rq7i3F?a
WT,I~'r=S
10 PRINT "Hello, world!" bT 42G[x
20 END n',X,P0
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或在提示符输入: 7d>w]R,Z
af |mk@
?"Hello, world!":END 6k;5T
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现代版BASIC(例如Quick BASIC): E<+ G5j
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Print "Hello, world!" :5/Ue,~ag
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以下的语句在Quick BASIC中同样有效: BkB_?^Nv8
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? "Hello,world!" Rs"=o>Qu
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BCPL 2{=D)aC$f
GET "LIBHDR" B1|nT?}J(
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LET START () BE -&7?!<f
$( UAXp;W`
WRITES ("Hello, world!*N") *B!Ox}CI.L
$) w>f.@luO4
0=HB!{@
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Befunge 'e]>lRZ
"!dlrow olleH">v 8[J%TWq%9
, 05ClPT\BCr
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+++++++++++++++.>.+++.------.--------.>+.>. TfZ M0Wz
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#include <stdio.h> x`7Le&4f
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int main(void) </_QldL_
{ wX)'1H):T
printf("Hello, world!\n"); zNo,PERG
return 0; V.`hk^V,
} J&\Q3_vro9
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! N2uJ?t
C++ )x\%*ewY
#include <iostream> Xk|a%%O*H
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int main() Wtu-g**KN
{ p]S'pzh
std::cout << "Hello, world!" << std::endl; A<c<!N
return 0; ktqFgU#rT
} JmCHwyUK?
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C++/CLI Fu{VO~w
int main() geK;r0(f
{ 2i6=g<
System::Console::WriteLine("Hello, world!"); -'miM ~kG[
} {'zS8
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C# (C Sharp) ^jL)<y4`
class HelloWorldApp ?qs LR
{ hd'QMr[;
public static void Main() _Ml?cT/J.O
{ ;C*2Djb*n
System.Console.WriteLine("Hello, world!"); ,?m@Ko7Y
} aOg9Dqtg)f
} YvG$2F |_)
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COBOL ~_;.ZZ-H]
IDENTIFICATION DIVISION. qmpT G:+
PROGRAM-ID. HELLO-WORLD. JzywSQ
wE1 GyN
ENVIRONMENT DIVISION. QyTNV
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DATA DIVISION. ,s%+vD$O^
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PROCEDURE DIVISION. 2d|^$$#`
DISPLAY "Hello, world!". 0c"9C_7^g
STOP RUN. 2UYtEJ(?`{
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h/C{
Common Lisp AUF[hzA
(format t "Hello world!~%") do^=Oq07$
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th*!EFA^o
DOS批处理 <k1muSe
@echo off Yqh-U%"'
echo "Hello, world!" ES,JdImZ|
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Eiffel 1^NC=IS9z
class HELLO_WORLD 6%t6u3
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creation $ H@
make oAN,_1v)
feature p
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make is EK>x\]O%T
local >N!
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io:BASIC_IO E5S(1Z}]p{
do T)22P<M8
!!io @+~URIG)
io.put_string("%N Hello, world!") 'U&]KSzxv
end -- make `@\FpV[|P
end -- class HELLO_WORLD ?-&k?I
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Erlang ql.[Uq
-module(hello). >9nVR
-export([hello_world/0]). #('R`~
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hello_world() -> io:fwrite("Hello, World!\n"). 6&