“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。 g a|RW0
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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》。 -w
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以下是用不同语言写成的Hello World程序的几个例子: =9$hZ c
Ada gwE#,OY*
with Ada.Text_Io; use Ada.Text_Io; WE\@ArY>
procedure Hello is ?U'c;*O-
begin pN# \
Put_Line ("Hello, world!"); zf-)c1$*r
end Hello; l>K z5re^
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汇编语言 d`]|i:*q
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x86 CPU,DOS,TASM cU
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MODEL SMALL 0'u2xe
IDEAL ?K,xxH
STACK 100H pvCn+y/U;
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DATASEG r.1/*i
HW DB 'Hello, world!$' $s$j</.q
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CODESEG dqwCyYC
MOV AX, @data ZL[~[
MOV DS, AX } LuPYCzpu
MOV DX, OFFSET HW <=WSX{_D
MOV AH, 09H 1F?`.~q
INT 21H L=Cm0q 3v
MOV AX, 4C00H A0{ !m
INT 21H Cv7FVl-I
END 3LXS}~&
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x86 CPU,GNU/Linux,NASM bxX[$q
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). &w\E*$
;Enter this into "hello.asm" then type: I2G4j/c=z
;"nasm -f elf hello.asm" ^8dd
;"ld hello.o -o hello" !Ld0c4
;"./hello" JU^{!u
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section .data ;data section declaration I|jGu9G
msg db 'Hello World!',0AH g+>$_s
len equ $-msg ;string length ]pUf[^4
,>(/}=Z.
section .text ;code section declaration i}SJ
global _start ;entry point (start of execution) DY2r6bcn`
_start: mov edx,len ;string length \-(.cj)?
mov ecx,msg ;string start ')C%CAYW
mov ebx,1 ;file handle: stdout ^6&?R?y
mov eax,4 ;sys_write x3ds{Z$,>(
int 80h ;kernel system call GFM$1}
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mov ebx,0 ;return value &k'J5YHm8H
mov eax,1 ;sys_exit >y&Db
int 80h ;kernel system call f-6hcd@Ca
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nNuv 0
x86 CPU,Windows,MASM32 ,_HSvs7-
.386 z'cVq}vl
.model flat,stdcall Glz)-hjJ:n
option casemap:none 'N1_:$z@(
;Include 文件定义 }yM /z
include windows.inc :N!Fe7H,
include user32.inc =.vc={_?
includelib user32.lib
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include kernel32.inc D0T0Km/"
includelib kernel32.lib _86pbr9
;数据段 jys1Ki
.data s$g"6;_\
szCaption db 'A MessageBox!',0 h<KE)^).
szText db 'Hello,world!',0 U)IW6)q
;代码段 9+'QH
.code t~mbe
start: L,!3
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Jpi\n-
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invoke ExitProcess,NULL "[f"h
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> tK9_]663
end start 4
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BEGIN { print "Hello, world!" } q ld2<W
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BASIC M4hzf
传统版BASIC(例如GWBASIC): X$"=\p>X
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10 PRINT "Hello, world!" oK cgP
20 END l2>ka~
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或在提示符输入: "`pI!nj
Vc}#Ok
?"Hello, world!":END wc#+Yh6
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现代版BASIC(例如Quick BASIC): .xXe *dm%
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Print "Hello, world!" ?m&?BsW$)
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以下的语句在Quick BASIC中同样有效: wps`2`z
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? "Hello,world!" QbGc 9MM
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BCPL pJM~'tlHV
GET "LIBHDR" 3#)I 7FG
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LET START () BE t*<@>] k
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WRITES ("Hello, world!*N") J%|!KQl
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Befunge ,sEu[m
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Brainfuck HKA7|z9{
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+++++++++++++++.>.+++.------.--------.>+.>. F :"CaDk
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#include <stdio.h> *P4G}9B|9:
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int main(void) uyr56
{ 9
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printf("Hello, world!\n"); <gU^#gsGra
return 0; X"V,3gDG
} ImJ2tz6
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C++ IipG?v0z~
#include <iostream> #]nH$Kq
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int main() }Dk*Hs^E
{ H8[L:VeNT
std::cout << "Hello, world!" << std::endl; Fb#_(I[aj
return 0; c(@V
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} vby[#S|
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C++/CLI ^l\U6$3
int main() &WW|! 6
{ I;dc[m
System::Console::WriteLine("Hello, world!"); )bc0 t]Fs
} H]@M00C
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C# (C Sharp) _tE`W96J
class HelloWorldApp n[Jpy[4g
{ 98u$5=Z'/
public static void Main() OhT?W[4
{ n[# !Q`D
System.Console.WriteLine("Hello, world!"); -)%l{@Mr
} qaK9E@l
} BU|=`Kb|))
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COBOL 6onFf* m!x
IDENTIFICATION DIVISION. b/N+X}VMN
PROGRAM-ID. HELLO-WORLD. 'F[m,[T%x
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ENVIRONMENT DIVISION. >"qnuv G
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DATA DIVISION. X) lz BM
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PROCEDURE DIVISION. E?>
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DISPLAY "Hello, world!". W79wz\a
STOP RUN. }:UNL^e?
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Common Lisp d_CY=DHF%`
(format t "Hello world!~%") 5c?1JH62o8
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DOS批处理 , VT&
@echo off ml=tS,
echo "Hello, world!" Ew>E]Ys
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^O_E
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Eiffel XV"8R"u%Q
class HELLO_WORLD feOX]g#
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creation $[5S M>e]
make &)?ECj0`
feature 2y/|/IW=
make is eh=.Q<N
local HyKvDJ
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io:BASIC_IO 92|\`\LP%
do }G,PUjg_^3
!!io sJ{S(wpi"
io.put_string("%N Hello, world!") QkJAjmB
end -- make fi*@m,-
end -- class HELLO_WORLD nCF1i2*6|"
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Erlang "8{#R*p
-module(hello). 9sQ7wlK
-export([hello_world/0]). {DzOXTI[Y
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hello_world() -> io:fwrite("Hello, World!\n"). XJ &