“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。 YFOK%7K
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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》。 (:].?o
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以下是用不同语言写成的Hello World程序的几个例子: s0v?*GRX
Ada V^nYG$si
with Ada.Text_Io; use Ada.Text_Io; ~;#J&V@D
procedure Hello is %yJL-6U
begin {4ON2{8;4
Put_Line ("Hello, world!"); C ,z7f"
end Hello; qO[6?q=c:
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汇编语言 zMt "ST.
U*,8,C
x86 CPU,DOS,TASM J]nb;4w
MODEL SMALL e V^@kI4
IDEAL O[y.3>l[s
STACK 100H E*>tFw&[
D<5)i)J"
DATASEG ,%mTKOs
HW DB 'Hello, world!$' RfDIwkpp
JT&CJ&#[h
CODESEG :1eI"])(
MOV AX, @data 6#6Ve$Vl]
MOV DS, AX O\pqZ`E=s
MOV DX, OFFSET HW kmNY
;b6Y$
MOV AH, 09H oP5G*AFUq
INT 21H >>Hsx2M
MOV AX, 4C00H ST)l0c+Y>
INT 21H I>bLgt]u3
END ##BMh!
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x86 CPU,GNU/Linux,NASM n'7 3DApW
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). f!e8xDfA
;Enter this into "hello.asm" then type: #>O,w0<qM
;"nasm -f elf hello.asm" \`jFy[(Pa'
;"ld hello.o -o hello" #nX0xV5=
;"./hello" <<LmO-92
n_AW0i.
section .data ;data section declaration Y1+4ppZ
msg db 'Hello World!',0AH s
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len equ $-msg ;string length Hs~M!eK
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section .text ;code section declaration a-x8LfcbF
global _start ;entry point (start of execution) l!Z>QE`.S
_start: mov edx,len ;string length N+\#k*n?
mov ecx,msg ;string start 26>e0hBh&
mov ebx,1 ;file handle: stdout gl:vJD
mov eax,4 ;sys_write !Qjpj KRy
int 80h ;kernel system call t#MU2b
kf_s.Dedw
mov ebx,0 ;return value ?,]%V1(@V`
mov eax,1 ;sys_exit 468LVe?0
int 80h ;kernel system call 3l->$R]
kI]i,v#F
pK1P-!c
x86 CPU,Windows,MASM32 qi`*4cas*A
.386 2W|4
.model flat,stdcall }fZT$'*;
option casemap:none })g|r9=
;Include 文件定义 s2_j@k?%
include windows.inc /#20`;~F)
include user32.inc 5|NM]8^^0[
includelib user32.lib V%dMaX>^i
include kernel32.inc LPb43
includelib kernel32.lib p]*$m=t0r
;数据段 r.xGvo{iY
.data d"Y9go"Z
szCaption db 'A MessageBox!',0 c~ l$_A
szText db 'Hello,world!',0 fW!~*Q
;代码段 .
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.code (k6=o';y
start: y7wy9+>l
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK i|Lir{vW
invoke ExitProcess,NULL 91E!4t}I
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> e%`gD*8
end start VvSD&r^qI
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BEGIN { print "Hello, world!" } Se*ZQtwE
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BASIC kGc;j8>."
传统版BASIC(例如GWBASIC): SEr\ u#
2U2=ja9:Y
10 PRINT "Hello, world!" ?'P8H^K6u
20 END xE;4#+_I
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或在提示符输入: %FT F
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?"Hello, world!":END 3F5r3T6j}
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现代版BASIC(例如Quick BASIC):
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Print "Hello, world!" 7SoxsT)
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以下的语句在Quick BASIC中同样有效: `O.*qs5
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? "Hello,world!" m=z-}T5y!T
\! Os!s
DC]FY|ff
BCPL g v&xC 6>
GET "LIBHDR" +z+25qWi
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LET START () BE Yt++?
$( ;EW]R9HCH
WRITES ("Hello, world!*N")
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$) h#^IT
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Befunge {[hV['Awv
"!dlrow olleH">v f5
wn`a~h
, hx+a.N
^_@ \|@]XNSN
L'J$jB5cP
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++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< @'?<92A
+++++++++++++++.>.+++.------.--------.>+.>. _T6WA&;8
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C L=Dd`
#include <stdio.h> 5Jp@n .
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int main(void) VHM ,W]
{ =9i:R!,W
printf("Hello, world!\n"); x/~V
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return 0; 1oFU4+{ 4
} B*zb0hdo:
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C++ nrUrMnlg
#include <iostream> 9^4^EY#
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int main() KG'4;Z5J
{ \x(J vDt
std::cout << "Hello, world!" << std::endl; d5T0#ue/e
return 0; |ZJ]`qmZ
} @8DBLn w
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# h/-
C++/CLI Rr^<Q:#"<|
int main() r}WV"/]p
{ 8niQG']
System::Console::WriteLine("Hello, world!"); }z,4IHNn
} B:n9*<v(
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C# (C Sharp) -[~{c]/ c
class HelloWorldApp pA!+;Y!ZB<
{ |5F]y"Nb
public static void Main() []1VD#
{ RA+Y ./*h
System.Console.WriteLine("Hello, world!"); /]>&OSV
} hnvn&{|
} ]QtdT8~
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COBOL ti`z:8n7
IDENTIFICATION DIVISION. m589C+7
PROGRAM-ID. HELLO-WORLD. )cUc}Avg}
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ENVIRONMENT DIVISION. er+m:XuV
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DATA DIVISION. cI?dvfU?
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PROCEDURE DIVISION. JXftQOn
DISPLAY "Hello, world!". Zul]ekv
STOP RUN. EqUiC*u8{I
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VaZS_qGe:
Common Lisp zO9$fU
(format t "Hello world!~%") M_T$\z;,
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DOS批处理 W2%(a0p
@echo off 5;>M&qmN
echo "Hello, world!" A8e b{qv
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Eiffel ^+mSf`5
class HELLO_WORLD Nq9Qsia&
G+m|A*[>
creation A}~hc&J
make h[C!cX
feature yf3%g\k
make is yIXM}i:
local ^(N+s?
io:BASIC_IO .2.$Rq
do feIAgd},
!!io }}cVPB7
io.put_string("%N Hello, world!") BtBy.bR
end -- make f|Z3VS0x
end -- class HELLO_WORLD >f'nl
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Erlang %Q1v8l.}
-module(hello). R@=ve
%a-
-export([hello_world/0]). qk~QcVg
[jDO8n/
hello_world() -> io:fwrite("Hello, World!\n"). #ZCgpg$wM
}C2I9Cl
K\IS"b3X
Forth KP_=#KD
." Hello, world!" CR H#m)`=nZSZ
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Fortran .Z8 x!!Q*
WRITE(*,10) udp&