“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。 af^@
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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》。 6i^0T
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以下是用不同语言写成的Hello World程序的几个例子: |y'b217t
Ada 8|Q4-VK<!
with Ada.Text_Io; use Ada.Text_Io; M +\rX1T
procedure Hello is w0\4Wa
begin =X<)5IS3
Put_Line ("Hello, world!"); 'H
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end Hello; ;7)OSGR
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DZF[dxH
汇编语言 @b8X%0B7
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x86 CPU,DOS,TASM W3aXW,P. V
MODEL SMALL d7\k gh
IDEAL S]tkz*w0*
STACK 100H <&*#famX
HI7]%<L
DATASEG ho(5r5SNE
HW DB 'Hello, world!$' rn[$x(G
$)4GCP
CODESEG Ae3,W
MOV AX, @data t.gq5Y.[
MOV DS, AX CuF%[9[cT
MOV DX, OFFSET HW KC#kss
MOV AH, 09H Bi$
0{V Z8
INT 21H VM=hQYe
MOV AX, 4C00H b*@&c9I;q
INT 21H =I
%g;YK
END t00\yb^vJ8
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j\%?<2dj=
x86 CPU,GNU/Linux,NASM
#_?426Wfs
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). >SY2LmV'a
;Enter this into "hello.asm" then type: _K*\}un2
;"nasm -f elf hello.asm" N`y}Gs
;"ld hello.o -o hello" <W=~UUsn
;"./hello" jdV .{8@
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section .data ;data section declaration ^aGZJiyJ
msg db 'Hello World!',0AH ey'pm\Z
len equ $-msg ;string length C.b,]7i
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section .text ;code section declaration 9;>@"e21R
global _start ;entry point (start of execution) Ec7{BhH)
_start: mov edx,len ;string length pCB
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mov ecx,msg ;string start 94Kuy@0:+
mov ebx,1 ;file handle: stdout i*mZi4URN
mov eax,4 ;sys_write $.suu^>^w
int 80h ;kernel system call +#de8/x
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mov ebx,0 ;return value $gj+v+%N
mov eax,1 ;sys_exit l044c,AW(
int 80h ;kernel system call f.U0E6-(3N
0})7of
_mIa8K;
x86 CPU,Windows,MASM32 +cV5h
.386 JLFFh!J
.model flat,stdcall a2(D!_dZR
option casemap:none CS^ oiV%{s
;Include 文件定义 lOWB^uS%
include windows.inc X]3l| D
include user32.inc Cg]3(3
includelib user32.lib 5WtQwN~
include kernel32.inc }"g21-T^
includelib kernel32.lib PMz{8
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;数据段 !:g>CDA
.data Qwp\)jVi
szCaption db 'A MessageBox!',0 }(f.uN_v
szText db 'Hello,world!',0 6ywnyh
;代码段 iECC@g@a
.code ,N))=/
start: $~w@0Yl
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Hm.&f2|(
invoke ExitProcess,NULL G>_42Rp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> A/Fs?m{7U
end start LoV*YSDAY
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do?S,'(g
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BEGIN { print "Hello, world!" } ]$?zT`>(F
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BASIC mhJOR'2
传统版BASIC(例如GWBASIC): f/IRO33
)=,9`+Zta
10 PRINT "Hello, world!" SS45<!iy
20 END kERaY9L\
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或在提示符输入: _I
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?"Hello, world!":END &ls!IN
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现代版BASIC(例如Quick BASIC): l;][Q]Z@V
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Print "Hello, world!" 33v%e
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以下的语句在Quick BASIC中同样有效: (X`t"*y"
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? "Hello,world!" %unK8z
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BCPL Lct+cKKU
GET "LIBHDR" :;hBq4h
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LET START () BE |qudJucV
$( tWX+\ |
WRITES ("Hello, world!*N") g)r,q&*
$) ^) b7m
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Befunge t&Y^W <
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~E:/oV:4 >
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Brainfuck WG[0$j
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< C7*Yg$`{
+++++++++++++++.>.+++.------.--------.>+.>. r{:la56Xd
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C HjF'~n
#include <stdio.h> xzf)_ <
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int main(void) J`D<
{ GPhwq n{
printf("Hello, world!\n"); Y8CYkJTAD-
return 0; cJE>;a
} b!tZ bX#
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C++ `9"jHw`D
#include <iostream> -3XnK5
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int main() ne~#{q
{ ^~kFC/tQ
std::cout << "Hello, world!" << std::endl; I:2jwAl
return 0; YwTtI ID%
} HBkQ`T
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{ dxyBDK
C++/CLI AE@Rn(1.
int main() ;og<eK
{ K>p:?w
System::Console::WriteLine("Hello, world!"); #S74C*'8
} :95_W/l
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C
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C# (C Sharp) ?=o]Wx0(9
class HelloWorldApp sU3V)7"
{ 8i
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public static void Main() .\\#~r`t 3
{ :r+
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System.Console.WriteLine("Hello, world!"); 46JP1
} CZno2$8@e
} KD<`-b)7<
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COBOL TgG)btQ
IDENTIFICATION DIVISION. pNme jz:
PROGRAM-ID. HELLO-WORLD. -PuVI5L<
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ENVIRONMENT DIVISION. f*f9:xUY
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DATA DIVISION. b<MMli
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PROCEDURE DIVISION. lcLxqnv
DISPLAY "Hello, world!". l@9:VhU(
STOP RUN. Xq$0% WjG
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Common Lisp PltPIu)F
(format t "Hello world!~%") C'"6@-~
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DOS批处理 %[;KO&Ga