“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。 H.;}%id
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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》。 !\1)?&y9j
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以下是用不同语言写成的Hello World程序的几个例子: XK/l1E3N
Ada \yw5`5g
with Ada.Text_Io; use Ada.Text_Io; wH@S$WT
procedure Hello is >%92,hg
begin G,?a8(
Put_Line ("Hello, world!"); 59j`Z^e
end Hello; ><"|>(y
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汇编语言 +VW8{=$
e/+.^ '{
x86 CPU,DOS,TASM e
}C,)
MODEL SMALL (Ytr&gh;0
IDEAL m`8{arz2
STACK 100H c\rP
-"C
UTu~"uCR
DATASEG OZf@cOTWK
HW DB 'Hello, world!$' PZJn/A1
3zKeN:w
CODESEG 4V,p\$;
MOV AX, @data r7_%t_O|IL
MOV DS, AX n]4Elrxx
MOV DX, OFFSET HW Q~wS2f`)
MOV AH, 09H iVeH\a
INT 21H G?,3Zn0
MOV AX, 4C00H ! })Y9oZc8
INT 21H nxuH22:
END v+g:0
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x86 CPU,GNU/Linux,NASM eA]8M^
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). xWY\,'+Q
;Enter this into "hello.asm" then type: X0j> g^b8
;"nasm -f elf hello.asm" C"5P7F{
;"ld hello.o -o hello" t D
8l0
;"./hello" fATVAv
@?]>4+Oa0
section .data ;data section declaration 1@LUxU#Uu$
msg db 'Hello World!',0AH
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len equ $-msg ;string length ^.@%n1I"5y
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section .text ;code section declaration ~cO iv
global _start ;entry point (start of execution) vdUKIP
=|_
_start: mov edx,len ;string length .UX4p
=
mov ecx,msg ;string start kUGFg{"
mov ebx,1 ;file handle: stdout GL9'dL|
mov eax,4 ;sys_write d#d&CJAfr
int 80h ;kernel system call 7>MG8pf3a
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mov ebx,0 ;return value gx^!&>eIb#
mov eax,1 ;sys_exit vmNI$KZM
int 80h ;kernel system call b5%<},ySq
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x86 CPU,Windows,MASM32 I<<1mEk
.386 *K?UWi#$
.model flat,stdcall d:A'|;']
option casemap:none 2x|FVp
;Include 文件定义 5"b1:
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include windows.inc cQd?,B3#F
include user32.inc *v8daF
includelib user32.lib sxuP"4
include kernel32.inc lq3D!+m
includelib kernel32.lib )AcevEHB
;数据段 WB'1_a
.data rZB='(?
szCaption db 'A MessageBox!',0 x.pg3mVd>
szText db 'Hello,world!',0 1D[>oK\
;代码段 '/loJz 1
.code pd,d"+
start: -Mrt%1g
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK R64f0NK.
invoke ExitProcess,NULL TT3GGHR
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> RRQv<x
end start M?('VOy)
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AWK 4|Y1W}!0/
BEGIN { print "Hello, world!" } >;j&]]-&
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BASIC ra^%__N}
传统版BASIC(例如GWBASIC): (w"(RM~
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10 PRINT "Hello, world!" ~W4SFp
20 END 2$t%2>1>@
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或在提示符输入: x}WP1YyT~
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?"Hello, world!":END #J5_z#-Q;
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现代版BASIC(例如Quick BASIC): ,|zzq@fk
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Print "Hello, world!" '+iLW~
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以下的语句在Quick BASIC中同样有效: *""W`x
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? "Hello,world!" j5/|1N
G[_Z|Xi1
c`S+>:
BCPL z_KCG2=5
GET "LIBHDR" UpSJ%%.n
grkA2%N
LET START () BE @ %q>Jd
$( ;0?OBUDO
WRITES ("Hello, world!*N") }1Mf0S
$) NN+;I^NqW&
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(ToD
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Befunge w0H#M)c
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, IBu\Sh-
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Brainfuck /e|qyWs
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+++++++++++++++.>.+++.------.--------.>+.>. ${wp}<u_
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C +NvpYz
#include <stdio.h> jr#*;go
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int main(void) <_=O0 t|6
{ k w
printf("Hello, world!\n"); OkT@ _U
return 0; ]Z85%q^`
} B~&}Mv
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C++ 5.yiNWh
#include <iostream> Q^@7Yg@l
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int main() Ix@B*Xz:`
{ gsa@ci
std::cout << "Hello, world!" << std::endl; G'dN<Nw6
return 0; :mf&,?
} BxQ,T@
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C++/CLI 31e
O2|7
int main() ^~bdAO81
{ A+4Kj~`!
System::Console::WriteLine("Hello, world!"); #O8=M(- V
} >w.%KVBJ
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C# (C Sharp) F:Ps>
class HelloWorldApp !su773vo
{ V3a6QcG
public static void Main() Bx$?*y&f!v
{ UM]3MS:[
System.Console.WriteLine("Hello, world!"); TGPZUyi3!=
} mV4gw'.;7
} P7/Xh3
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hy$VG%b;#
COBOL f4+wP/n&
IDENTIFICATION DIVISION. m^TN6/])
PROGRAM-ID. HELLO-WORLD. ObS#aRq
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ENVIRONMENT DIVISION. B8.}9
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DATA DIVISION. /nX_Q?mo
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PROCEDURE DIVISION. :7dc;WdM
DISPLAY "Hello, world!". '}bmDb*
STOP RUN. 8xhx*A
A 2A_F|f
v.u 5%
Common Lisp e+VE FWz
(format t "Hello world!~%") h9iQn<lp4.
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,\#s_N7
DOS批处理 cN&:V2,
@echo off C|3cQ{
echo "Hello, world!" ZBN,%P!P0
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BD86t[${W
Eiffel asLrXGGyT
class HELLO_WORLD `s Pk:cNz~
b7T;6\[m
creation #)[.Xz:U
make y*US^HJOZ
feature , `EOJ"|
make is C-h?#/#?y
local zfg+gd)Z
io:BASIC_IO @M'qi=s*
do @v&