“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。 fxKhe[;
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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》。 8qY\T0
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以下是用不同语言写成的Hello World程序的几个例子: 3h-C&C
Ada / .ddx<
with Ada.Text_Io; use Ada.Text_Io; !C$bOhc
procedure Hello is E 9LKVs}
begin ;$Q&2}L[
Put_Line ("Hello, world!"); DiLZ5^`]
end Hello; [aF^ D;o
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汇编语言 x8]5> G8(r
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x86 CPU,DOS,TASM 18xT2f
MODEL SMALL lS.&>{
IDEAL quPNwNy
STACK 100H GYq.!d@O
Qg\{d)X[N
DATASEG SQ_w~'(
HW DB 'Hello, world!$' l6wN&JHTh
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CODESEG gh{Z=_
MOV AX, @data M'
d ,TV[
MOV DS, AX Hmi]qK[F
MOV DX, OFFSET HW vl{G;[6
MOV AH, 09H ?!4xtOA
INT 21H pW>?%ft.
MOV AX, 4C00H cR0OJ'w
INT 21H *)6:yn
END O~1vX9
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x86 CPU,GNU/Linux,NASM hrRkam !y
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). +l "z
;Enter this into "hello.asm" then type: t69C48}15
;"nasm -f elf hello.asm" G{ 9p.Q
;"ld hello.o -o hello" |H LU5=Y
;"./hello" xKl!{A9$w
C{r Sq
section .data ;data section declaration ,o3{?o]s
msg db 'Hello World!',0AH >*hY1@N1
len equ $-msg ;string length X<OOgC
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section .text ;code section declaration *C(/2
global _start ;entry point (start of execution) gW[(gf.oo
_start: mov edx,len ;string length k{?Pgf27
mov ecx,msg ;string start aOj(=s
mov ebx,1 ;file handle: stdout 9F&s9(=\
mov eax,4 ;sys_write
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int 80h ;kernel system call h*2NFL~#
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mov ebx,0 ;return value xMdbS4 &!
mov eax,1 ;sys_exit (H\)BS7#R
int 80h ;kernel system call eB$S d
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x86 CPU,Windows,MASM32 TbY<(wrMZ
.386 @w H+,]xE
.model flat,stdcall Vh WF(*
option casemap:none @.PVUP
;Include 文件定义 lBbUA)z6
include windows.inc jI-\~
include user32.inc ]Ywj@-*q
includelib user32.lib `H_.<``>
include kernel32.inc P2q'P&
includelib kernel32.lib `pHlGbrW
;数据段 LZ97nvK
.data km)5?
szCaption db 'A MessageBox!',0 .fQ/a`AsU
szText db 'Hello,world!',0 4!%TY4bJ
;代码段 o]#M8)=
.code XpFoSW#K
start: x2^Yvgc-
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK | m^qA](M
invoke ExitProcess,NULL 80p? qe
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 8b^v@|)N
end start xS4B"/
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BEGIN { print "Hello, world!" } :|GC~JElo5
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C
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BASIC J^Dkx"1GD
传统版BASIC(例如GWBASIC): y?t2@f]!XK
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10 PRINT "Hello, world!" RY>BP[h
20 END (&=<UGY(w
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或在提示符输入: 9WJS.\G^
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?"Hello, world!":END !zhg3B#p
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现代版BASIC(例如Quick BASIC): !L+4YA
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Print "Hello, world!"
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以下的语句在Quick BASIC中同样有效: wTpjM@F?J|
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? "Hello,world!" /``4!jU
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DE{tpN
BCPL /_N*6a~
GET "LIBHDR" )9^0Qk' ]
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LET START () BE ,9(=Iu-?1
$( EXdx$I=X
WRITES ("Hello, world!*N") rRTAWAs%T
$) J?yNZK$WqN
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4`x.d
Befunge 'Xl_,;W]
"!dlrow olleH">v x6, #Jp
, /EN3>25"#
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Brainfuck $_j\b4]%
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+++++++++++++++.>.+++.------.--------.>+.>. kIm)Um
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C ?r~|B/]
#include <stdio.h> _TB,2 R
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int main(void) ` )9nBZ
{ L(p{>Ykcc
printf("Hello, world!\n"); H`js1b1n
return 0; IfGmA.O
} 6;LM1
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C++ F,t
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#include <iostream> Fk:yj 4'
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int main() 'T(7EL3$}
{ l!U_7)s/
std::cout << "Hello, world!" << std::endl; Z!@<[Vo6
return 0; X~aD\%kC7
} 20 j9~+
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C++/CLI U_/sY9gz(
int main()
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{ UDJ{iZ
System::Console::WriteLine("Hello, world!"); .
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} w]4=uL6
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C# (C Sharp) ZT
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class HelloWorldApp e <Hbm
{ ;.=ZwM]C
public static void Main() (+@
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{ r<Il;?S6
System.Console.WriteLine("Hello, world!"); we6kV-L.
} E%R^
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} >~;MQDU5*Y
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COBOL `MMh"# xN
IDENTIFICATION DIVISION. #=tWjInm
PROGRAM-ID. HELLO-WORLD. &3
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ENVIRONMENT DIVISION. 8hx4s(1!
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DATA DIVISION. `m6>r9:
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PROCEDURE DIVISION. ~$#"'Tl4J
DISPLAY "Hello, world!". J 3oEN'8S
STOP RUN. ubC(%Y_k
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