“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。 j*.K|77WHj
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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》。 TANv)&,|9
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以下是用不同语言写成的Hello World程序的几个例子: -w dbH`2Z"
Ada e^LjB/<Th
with Ada.Text_Io; use Ada.Text_Io; WE{fu{x
procedure Hello is XIGz_g;#'w
begin H*m3i;"4p\
Put_Line ("Hello, world!"); B\73Vf
end Hello; kB)u@`</mV
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汇编语言 *:5S*E&}V
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x86 CPU,DOS,TASM :17Pc\:DS
MODEL SMALL ~WjK'N4n5
IDEAL X[ 6#J
STACK 100H OH\(;RN*
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DATASEG 0P5s'2w
HW DB 'Hello, world!$' \,AE5hnO
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CODESEG jIL+^{K<
MOV AX, @data &KYPi'C9!z
MOV DS, AX (#c|San
MOV DX, OFFSET HW &G|^{!p/G
MOV AH, 09H x5(6U>-Y
INT 21H u |mTF>L
MOV AX, 4C00H zA>LrtyK(=
INT 21H 2zV{I*
END =*5< w
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x86 CPU,GNU/Linux,NASM ~Ydm"G
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). |AQU\BUj
;Enter this into "hello.asm" then type: `pYyr/
;"nasm -f elf hello.asm" ?u?Nhf
%b
;"ld hello.o -o hello" o"V+W
;"./hello" $a01">q&y
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section .data ;data section declaration A_\`Gj!s%
msg db 'Hello World!',0AH 68UfuC
len equ $-msg ;string length B? aMX,1
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section .text ;code section declaration g8SVuG<DI\
global _start ;entry point (start of execution) eJ%b"H!
_start: mov edx,len ;string length \8Hs[H!
mov ecx,msg ;string start q^DQ9B
mov ebx,1 ;file handle: stdout ]#\De73K
mov eax,4 ;sys_write
hm\UqIt
int 80h ;kernel system call kaT
!
uq2C|=M-x\
mov ebx,0 ;return value kz*6%Cg*~
mov eax,1 ;sys_exit P;G]qV%
int 80h ;kernel system call 2oF1do;
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x86 CPU,Windows,MASM32 .iC!Ttr
.386 N/!(`Z,
.model flat,stdcall GBl[s,g[|
option casemap:none :jf/$]p
;Include 文件定义 .k-t5d
include windows.inc b/w5K2
include user32.inc zIA)se
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includelib user32.lib r;9 V7C
include kernel32.inc {4$aA*
includelib kernel32.lib DDq?4
;数据段 %a?\y_a=b
.data n)j0h-
szCaption db 'A MessageBox!',0 I
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szText db 'Hello,world!',0 p/qu4[Mm
;代码段 xi<yB0MoA
.code Yr*!T= z
start: S"t\LB*'Ls
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 1=h5Z3/fj
invoke ExitProcess,NULL iR!]&Oh
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> c{IL"B6>
end start zm{`+boH<
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BEGIN { print "Hello, world!" } m^~5Xr"
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BASIC gq]@*C
传统版BASIC(例如GWBASIC): MH|F<$42
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10 PRINT "Hello, world!" I)kc[/^j$
20 END =A*a9c2
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或在提示符输入: 1%C EUE
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?"Hello, world!":END ?t<g|H/|6
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现代版BASIC(例如Quick BASIC): }H<Z`3_U%
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Print "Hello, world!" N4z[=b>
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以下的语句在Quick BASIC中同样有效: L]%!YP\<T
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? "Hello,world!" %
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GET "LIBHDR" ZXN`8!]&
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LET START () BE P3IBi_YyG1
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WRITES ("Hello, world!*N") cs7^#/3<
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|!c
Befunge B9Mp3[
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+++++++++++++++.>.+++.------.--------.>+.>. 8#HnV%|N
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C <Y6zJ#BD
#include <stdio.h> `K:n=hpF
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int main(void) _BY+Tfol
{ 4Y}Nu
printf("Hello, world!\n"); :?j=MV
return 0; :nR80]
} }K@m4`T
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C++ /qJC p![X
#include <iostream> oc]:Ty
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int main() =|``d-
{ d=meh4Y
std::cout << "Hello, world!" << std::endl; %[5GG d5w
return 0; ke!
} D/Ok
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C++/CLI m?4hEwQxf
int main() I]i(
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{ X.S<",a{qz
System::Console::WriteLine("Hello, world!"); &tvtL
} a]7g\rg)
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C# (C Sharp) M]p-<R\
class HelloWorldApp k7Qs#L
{ (_!I2"Q*
public static void Main() vb?.`B_>&
{ 9od*N$
System.Console.WriteLine("Hello, world!"); c_S~{a44Ud
} .)$MZyo
} z/+{QBen8
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COBOL 54Rp0otv
IDENTIFICATION DIVISION. |&{S ~^$
PROGRAM-ID. HELLO-WORLD. M49l2x=]9
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ENVIRONMENT DIVISION. >qOG^{&x
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DATA DIVISION. qEXN}Pq<
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PROCEDURE DIVISION. M_Ag*?2I
DISPLAY "Hello, world!". uV_%&P
STOP RUN. $pAJ$0=sw
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Common Lisp $/C1s"C@O
(format t "Hello world!~%") q`/J2r+O
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DOS批处理 tuIZYp8tIN
@echo off ,pI9=e@O/z
echo "Hello, world!" ohqThl
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=?0v,;F9|
Eiffel !L9OJ1F
class HELLO_WORLD s5{=lP
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creation |u?VlRt
make 1s@QsZ3
feature 2/r8%Sq
make is ,3 /o7 '
local Sx QA*}N
io:BASIC_IO RG'76?z
do (m,H 5
!!io [
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io.put_string("%N Hello, world!") m{=Q88k!@.
end -- make kMurNA=
end -- class HELLO_WORLD rkR5>S( 2M
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Erlang F/BR#J1
-module(hello). '7el`Ff
-export([hello_world/0]). jw=PeT|
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hello_world() -> io:fwrite("Hello, World!\n"). ;j/$%lC
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Forth CA0XcLiFt
." Hello, world!" CR rX?ZUw?u&
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Fortran ').)0;
WRITE(*,10) \ m~?yq8H
10 FORMAT('Hello, World!') Zf@B<
m
STOP 30uPDDvar
END
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