“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。 pO x0f;'G+
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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》。 XlR.Y~
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以下是用不同语言写成的Hello World程序的几个例子: ~%>ke
Ada Q]66v$
with Ada.Text_Io; use Ada.Text_Io; 3>c<E1
procedure Hello is +Z/Pj_.o
begin Pij*?qmeQ
Put_Line ("Hello, world!"); qm]k
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end Hello; U^:+J-z{
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汇编语言 b,~6cDU
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x86 CPU,DOS,TASM ..;}EFw5
MODEL SMALL ^~(@QfY
IDEAL O~trv,?)
STACK 100H -NHc~=m
<`n T+c
DATASEG jl%27Ld
HW DB 'Hello, world!$' a%V6RyT4qW
y/Paq^Hd
CODESEG c?>@P
MOV AX, @data 0LN"azhz
MOV DS, AX eG =Hyc
MOV DX, OFFSET HW E2+O-;VN
MOV AH, 09H ALJ^XvB4V
INT 21H auK*\Wjm?
MOV AX, 4C00H e@w-4G(;
INT 21H %?@N-$j
END g>u{H:
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x86 CPU,GNU/Linux,NASM #J#x,BLI
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /X9K g
;Enter this into "hello.asm" then type: M e_.X_
;"nasm -f elf hello.asm" OXT 5
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;"ld hello.o -o hello" -Uh3A\#(
;"./hello" ewvFUD'j
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section .data ;data section declaration {ZrIA+eH
msg db 'Hello World!',0AH zU}Ru&T9
len equ $-msg ;string length .}=gr+<bf
bXmX@A$#Io
section .text ;code section declaration 33:{IV;k
global _start ;entry point (start of execution) g\ilK:r}
_start: mov edx,len ;string length k><k|P[|
mov ecx,msg ;string start MZZEqsD5[
mov ebx,1 ;file handle: stdout )7f;FWI
mov eax,4 ;sys_write (_Ph{IN
int 80h ;kernel system call !?#B*JGFS
Psm5J80}n
mov ebx,0 ;return value bwG$\Oe6
mov eax,1 ;sys_exit PFq1Zai}n|
int 80h ;kernel system call I!Z=3 $,
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x86 CPU,Windows,MASM32 /g(WCKva
.386 ps[HvV"
.model flat,stdcall "}fJ 2G3
option casemap:none :qy< G!o
;Include 文件定义 Qqm'Yom%T
include windows.inc rom`%qp^
include user32.inc +#ufW%ZG
includelib user32.lib -Ri/I4Xj
include kernel32.inc <A@}C+
includelib kernel32.lib e98f+,E/
;数据段 |zd+
\o
.data w#0/&\b=
szCaption db 'A MessageBox!',0 ~}Xd{afo
szText db 'Hello,world!',0 !Pd@0n4
;代码段 "Te[R%aP
.code 8~*
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start: ||yx?q6\h
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 57@6O-t-
invoke ExitProcess,NULL %wil'
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> .6C9N{?Tqf
end start %'+}-w
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BEGIN { print "Hello, world!" } EC;R^)
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BASIC l5P!9P
传统版BASIC(例如GWBASIC): <UsFB F
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10 PRINT "Hello, world!" )IBvm1
20 END S@4p.NMU
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或在提示符输入: 8/gA]I
6=#
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?"Hello, world!":END _"l2UDx
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现代版BASIC(例如Quick BASIC): 1egq:bh
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Print "Hello, world!" vd{ban9
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以下的语句在Quick BASIC中同样有效: <DR$WsDG
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? "Hello,world!" Dm{9;Abs%
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BCPL |-l9 Z
GET "LIBHDR" #|j8vmfn$e
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LET START () BE E|_J
$( MZd?cS
WRITES ("Hello, world!*N") LS:^K
$) F%< ZEVm
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Befunge '><I|c}
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#=uV, dw
Brainfuck u(W>HVEG
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+++++++++++++++.>.+++.------.--------.>+.>. -y|*x-iZ
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C nPW=m`jG
#include <stdio.h> q x5jaa3
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int main(void) l6T^e@*
{ y0]"qB
printf("Hello, world!\n"); FFtB#
return 0; ZHM NG~!
} )k[{re
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C++ \RS0mb
#include <iostream> )tm%0z7R
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int main() }v xRjO,
{ :JXGgl<y
std::cout << "Hello, world!" << std::endl; @rP#ktz]
return 0; f
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C++/CLI L[voouaqm
int main() \MDhm,H<
{ K%.t%)A_3
System::Console::WriteLine("Hello, world!"); }ijFvIHV
} eGW
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C# (C Sharp) T@xaa\bzg
class HelloWorldApp V'FKgzd
{ #Xk/<It
public static void Main() 8I~*9MUp
{ {nMCU{*k
System.Console.WriteLine("Hello, world!"); soOfk!b
} o'_eLp
} SaOOD-u
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COBOL BsR3$
IDENTIFICATION DIVISION. *+%$OH,
PROGRAM-ID. HELLO-WORLD. j9/hZqo
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ENVIRONMENT DIVISION. KwY6pF*
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DATA DIVISION. P N(<=v&E
qN'%q+n
PROCEDURE DIVISION. 0HI0/Tvu$<
DISPLAY "Hello, world!". W[LQ$uj
STOP RUN. p^C$(}Yh
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Common Lisp z
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(format t "Hello world!~%") bo#?,80L}`
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DOS批处理 ~H4Tr[8a
@echo off QsPZ dC
echo "Hello, world!" ~
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nTE\EZ+=2
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Eiffel Iv{uk$^7S
class HELLO_WORLD 5 Nt9'"
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creation "`V:4uz
make zUA
-
feature G%dzJpC(
make is Z*Fn2I4
local _=K\E0I.m
io:BASIC_IO
uyoV)
do ;?{OX
!!io ?'si^N
io.put_string("%N Hello, world!") _z@_.%P\
end -- make m' eM&1Ba
end -- class HELLO_WORLD ,_bG'Hmt
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Erlang 2E.D0E Cu
-module(hello). z>HM$n`YD
-export([hello_world/0]). ^qtJcMK+hq
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