“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。 (]0JI1
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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》。 tgy*!B6a~
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以下是用不同语言写成的Hello World程序的几个例子:
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Ada h.@5vhD
with Ada.Text_Io; use Ada.Text_Io; Q?KWiFA}'
procedure Hello is FU9q|!2Y
begin p9k'.H^:_
Put_Line ("Hello, world!"); I/D(gY06<
end Hello; H(U`S
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汇编语言 \EF^Ag
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x86 CPU,DOS,TASM G9ku(2cq
MODEL SMALL +CL`]'~;E-
IDEAL 8 SII>iL{
STACK 100H SW|{)L,
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DATASEG <U(wLG'XS
HW DB 'Hello, world!$' iIFM 5CT
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CODESEG Coz\fL
MOV AX, @data )
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MOV DS, AX f0+)%gO{
MOV DX, OFFSET HW &GF@9BXI3
MOV AH, 09H zil^^wT0J
INT 21H hw/:
MOV AX, 4C00H ]cvP !
INT 21H }t }y
END nen(
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w 6
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x86 CPU,GNU/Linux,NASM ?-w<H!Y7
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 4lMf'V7*l
;Enter this into "hello.asm" then type: K
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;"nasm -f elf hello.asm" U^iNOMs?
;"ld hello.o -o hello" K*^3FO}JG
;"./hello" CN4Q++{
fz'@ON
section .data ;data section declaration LUSBRr8
msg db 'Hello World!',0AH k I
len equ $-msg ;string length (/TYET_H
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section .text ;code section declaration 3Au3>q,
global _start ;entry point (start of execution) SPfz/ q{
_start: mov edx,len ;string length W]b>k lp;
mov ecx,msg ;string start m{T:<:q~
mov ebx,1 ;file handle: stdout qzD<_ynA
mov eax,4 ;sys_write %mKM9>lf#
int 80h ;kernel system call *9J>3
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mov ebx,0 ;return value Yxik.S+G
mov eax,1 ;sys_exit 2wR?ON=Q
int 80h ;kernel system call 5=Cea
r ]JV!'R
jpijnz{M
x86 CPU,Windows,MASM32 @@->A9'L
.386 fS9TDy
.model flat,stdcall `5da
option casemap:none <r 2$k"*:
;Include 文件定义 ?wM{NVt#-
include windows.inc Msj(>U&}+
include user32.inc Sep/N"7~t
includelib user32.lib )Iu0MN&
include kernel32.inc !4Q0
includelib kernel32.lib kucH=96
;数据段 r{oRN
.data *?Hc8y-dG,
szCaption db 'A MessageBox!',0 aY:u-1
szText db 'Hello,world!',0 5dwC~vn}c
;代码段 Lg6;FbY?
.code eO7 )LM4
start: 8zhr;Srt
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK w)xiiO[
invoke ExitProcess,NULL L>xecep
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> FFC"rG
end start ~)ut"4
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AWK i`k{}!F
BEGIN { print "Hello, world!" } 3i\<#{
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BASIC _=Y?' gHH
传统版BASIC(例如GWBASIC): mf4C68DI@u
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10 PRINT "Hello, world!" jimWLF5Q5"
20 END &Ul8h,qw
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或在提示符输入: *z?Vy<u G
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?"Hello, world!":END ]*/%5ZOI&
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现代版BASIC(例如Quick BASIC): +g.lLb*#
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Print "Hello, world!" eHX;*~e6)
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以下的语句在Quick BASIC中同样有效: opaRk.p
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? "Hello,world!" YB`1S
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BCPL )#%v1rR
GET "LIBHDR" yxx9h3
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LET START () BE NC@L,)F
$( ^uCZO
WRITES ("Hello, world!*N") -d+o\qp"#
$) d
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Befunge m7$t$/g
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C |~]@hs~
#include <stdio.h> jA'7@/F/
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int main(void) ]@P!Q&V #
{ u%24%
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printf("Hello, world!\n"); UlD]!5NO
return 0; gcI?)F
} /:GeXDJw
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C++ ]8o[&50y
#include <iostream> \c(Z?`p]R1
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int main() JIOeDuw+
{ E{8-VmY
std::cout << "Hello, world!" << std::endl; Sv>bU4LHf
return 0; bdYx81
} yM
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C++/CLI /w/um>>K.
int main() GNX`~%3KYc
{ -qs
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System::Console::WriteLine("Hello, world!"); L "[>tY
} 3uy^o
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C# (C Sharp) X%R )
class HelloWorldApp U$m[{r2M
{ {8e4TD9E0
public static void Main() :pw6#yi8`
{ /r?EY&9G
System.Console.WriteLine("Hello, world!"); A$1Gc>C
} WB|N)3-1
} g^)8a;/c
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COBOL aB ^`3J
IDENTIFICATION DIVISION. 2]'cj
PROGRAM-ID. HELLO-WORLD. +Ua.\1"6
dw YGhhm
ENVIRONMENT DIVISION. p%#=OtkC
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DATA DIVISION. [J\! 2\Oo
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PROCEDURE DIVISION. Wagb|B\
DISPLAY "Hello, world!". /I~(*X
STOP RUN. $,8}3R5}
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Common Lisp Xf%wW[~
(format t "Hello world!~%") zL=PxFw0
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DOS批处理 #McX
@echo off '9tV-whw
echo "Hello, world!" XJ6=Hg4_O
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b~Un=-@5a
Eiffel qk_YFR?R
class HELLO_WORLD ['_W<
CT[CM+
creation JWVn@)s
make |0$7{nQ
feature `7
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make is JrGY`6##p
local hOR1RB
io:BASIC_IO xY@<