“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。 X+6`]]
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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》。 &!Sq6<!v2
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以下是用不同语言写成的Hello World程序的几个例子: va6e]p*Oy
Ada Wgp}v93
with Ada.Text_Io; use Ada.Text_Io; B<^yT@Wc
procedure Hello is LdAWCBLS
begin \.!+'2!m
Put_Line ("Hello, world!"); EL/~c*a/
end Hello; {nQ?+o3
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汇编语言 6b!F7kyg
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x86 CPU,DOS,TASM vMD%.tk
MODEL SMALL UQ[!k 6
IDEAL b({K6#?'[
STACK 100H 0Wd2Z-I
)-jA4!&
DATASEG Hsdcv~Xr;l
HW DB 'Hello, world!$' &7-ENg9 [
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CODESEG
EU5^"\
MOV AX, @data 9-B/n0
MOV DS, AX 0eMO`8u[A
MOV DX, OFFSET HW :}B=Bk/q
MOV AH, 09H P]A~:Lj
INT 21H @XJzM]*w&
MOV AX, 4C00H 5I`_SOa!
INT 21H 6y0CEly>3#
END ;#)vw;XR
t ZL|;K
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x86 CPU,GNU/Linux,NASM y"I8^CA
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Hoj'zY
;Enter this into "hello.asm" then type: kq$0~lNI$
;"nasm -f elf hello.asm" 6P$jMjs
;"ld hello.o -o hello" #qnK nxD
;"./hello" ow<z @^ 3'
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section .data ;data section declaration v?@=WG
msg db 'Hello World!',0AH <V
b
SEi
len equ $-msg ;string length (ah^</
y$,j'B:;4m
section .text ;code section declaration ABIQi[A
global _start ;entry point (start of execution) lj US-6
_start: mov edx,len ;string length _xz>O[unf
mov ecx,msg ;string start xoB "hNIX
mov ebx,1 ;file handle: stdout dxa[9>V
mov eax,4 ;sys_write j>I.d+
int 80h ;kernel system call AMSn^75
XS_Ib\-50
mov ebx,0 ;return value }Q1m
mov eax,1 ;sys_exit 9Od|R"aS|
int 80h ;kernel system call Q2LAXTF]y
9O{b8=\}
95IR.Qfn!
x86 CPU,Windows,MASM32 ?y|8bw<
.386 Aq*,cOF+
.model flat,stdcall ;\],R.!
option casemap:none y**>l{!!
;Include 文件定义 s~b!3l`gu
include windows.inc C'&t@@:
include user32.inc ^@-qnU lH
includelib user32.lib f1wwx|b%.
include kernel32.inc *USzzLq
includelib kernel32.lib >U#j\2!Sg
;数据段 WW3! ,ln_
.data jlM%Y
ZC
szCaption db 'A MessageBox!',0 0 >:RFCo
szText db 'Hello,world!',0 s g6e%
5
;代码段 IuOQX}
.code 5cZKk/"Ad}
start: )%Lgo${[;
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK gMB/ ~g5b0
invoke ExitProcess,NULL [W--%=Ou
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> $E35W=~)
end start tK LAA+Z
ibxtrt=
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AWK jx-8%dxtZ
BEGIN { print "Hello, world!" } v>'mW
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BASIC =G-u "QJ6
传统版BASIC(例如GWBASIC): A,f%0
eQR
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10 PRINT "Hello, world!" nH(Hk%~
20 END $-R9J6NN
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或在提示符输入: SX6P>:`
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?"Hello, world!":END 5:x .<
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现代版BASIC(例如Quick BASIC): -"X}
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Print "Hello, world!" i \u"+:j
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以下的语句在Quick BASIC中同样有效: '<KzWxuC
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? "Hello,world!" Q=cbHDB
:>GT<PPD;
^p !4`S
BCPL `@r#o&
GET "LIBHDR" js8GK
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LET START () BE `Ao;xOJ
$( S&m5]h!D
WRITES ("Hello, world!*N") D$[/|%3
$) u#m(Py
gHzjI[WI
4uUR2J
Befunge Cb/?hT
"!dlrow olleH">v 7f`x-iH!]7
, -?Aa RwZ,
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C'$}!p70
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C 8Bnw//_pT
#include <stdio.h> AH(O"v`
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int main(void) !jDqRXi(
{ uPpRzp
printf("Hello, world!\n"); {l7@<xZ??M
return 0; (d C<N3
} s=nE'/q1|
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C++ _u :4y4}
#include <iostream> B&m?3w
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int main() m~Dq0 T
{ ;v6e2NacM'
std::cout << "Hello, world!" << std::endl; b+M[DwPw
return 0; IfZaK([
} XfxNyZsy&>
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Tj{!Fx^H
C++/CLI ZtEHP`Iin
int main() #1zWzt|DW
{ ':!;6v|L
System::Console::WriteLine("Hello, world!"); b['TRYc=:
} <