“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。 GHO6$iM)[
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 "TVmxE%(
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以下是用不同语言写成的Hello World程序的几个例子: ]QQeUxi
Ada FzAzAl5
with Ada.Text_Io; use Ada.Text_Io; ,F n-SrB:
procedure Hello is ?aguAqG$
begin <b?$-Rx
Put_Line ("Hello, world!"); x->+wJm@s
end Hello; }tQ^ch; Q
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汇编语言 Z^J7r&\V
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x86 CPU,DOS,TASM >2ha6A[
MODEL SMALL 2|&SG3e+(I
IDEAL ZcN#jnb0/
STACK 100H 6(>,qt,9S
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DATASEG JL[!8NyU
HW DB 'Hello, world!$' a+j"8tHu$
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CODESEG 5n[''#D
MOV AX, @data k\r^GB
MOV DS, AX 5z:#Bl-,L
MOV DX, OFFSET HW e|q~t
{=9S
MOV AH, 09H ornU8H`
INT 21H (mioKO )?v
MOV AX, 4C00H j@{ B 8
INT 21H TiR00#b
END 0es\
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x86 CPU,GNU/Linux,NASM tns4 e\
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). f@k.4aS
;Enter this into "hello.asm" then type: $&&+2?cx0
;"nasm -f elf hello.asm" <*9(m
;"ld hello.o -o hello" bwa*|{R
;"./hello" W\<HUd
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section .data ;data section declaration )iJv?Y\]
msg db 'Hello World!',0AH D^}2ilk!
len equ $-msg ;string length <`?%Cz AO
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section .text ;code section declaration +.g j/uy*
global _start ;entry point (start of execution) DG}s`'
_start: mov edx,len ;string length r]U8WM3r
mov ecx,msg ;string start w&e3#p
mov ebx,1 ;file handle: stdout wB:<ICm
mov eax,4 ;sys_write *m2?fP\
int 80h ;kernel system call 13 %:3W(
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mov ebx,0 ;return value Er
-rm
mov eax,1 ;sys_exit [NV/*>"j&
int 80h ;kernel system call j<R&?*
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x86 CPU,Windows,MASM32 8A}<-?>
.386 DS_0p|2
.model flat,stdcall "y5bODq3t
option casemap:none 7-0j8$`
;Include 文件定义 g+7j?vC{'
include windows.inc y;(G%s1
include user32.inc ~z,qr09
includelib user32.lib q,> C^p|2b
include kernel32.inc .Hk.'>YR
includelib kernel32.lib R7KV
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;数据段 $<"I*l@
.data 0M?zotv0#
szCaption db 'A MessageBox!',0 o' v!83$L
szText db 'Hello,world!',0 yivWT;`
;代码段 ~SmFDg$/m
.code ZUvc|5]
start: 7 fXJP5j
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK /x4L,UJ= P
invoke ExitProcess,NULL p 16+(m
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> +DO<M1uE
end start \#IKirf?
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BEGIN { print "Hello, world!" } 'ka$@,s :
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BASIC bR;.KC3C
传统版BASIC(例如GWBASIC): 'Hs*
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10 PRINT "Hello, world!" `sgW0Uf
20 END ^8YBW<9
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或在提示符输入: Cs\jPh;"
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?"Hello, world!":END H}q$6WE
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现代版BASIC(例如Quick BASIC): uvw1 _j?
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Print "Hello, world!" gI"cZ h3}
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以下的语句在Quick BASIC中同样有效: 3_.%NgES|
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? "Hello,world!" r8!pk~R5]
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BCPL WQ9Q:F2
GET "LIBHDR" gVy`||z
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LET START () BE EXwU{Hl
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WRITES ("Hello, world!*N") 7j29wvSp5
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C Pc7p2
#include <stdio.h> a*:GCGe
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int main(void) O%6D2d
{ u } +?'B)
printf("Hello, world!\n"); C\vOxBAB
return 0; u^#e7u
} X[f)0w%
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C++ zL3zvOhu}
#include <iostream> `M. I.Z_
%<'.c9u5
int main() 6eA)d#
{ FjLMN{eH/
std::cout << "Hello, world!" << std::endl; p )]x,F
return 0; |[>yJXxEL@
} F2ISg'
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C++/CLI ^".6~{
int main() A zp!;+
{ W-Vc6cq
System::Console::WriteLine("Hello, world!"); K5t.OAA:
} E7_OI7C
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C# (C Sharp) H
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class HelloWorldApp pYu6[
{ /L5:/Z
public static void Main() Y> ATL
{ 3-)}.8F
System.Console.WriteLine("Hello, world!"); !_;J@B
} DL,]iJm
} TIR Is1
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COBOL q)KOI`A
IDENTIFICATION DIVISION. {MTtj4$
PROGRAM-ID. HELLO-WORLD. &-X51O C
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ENVIRONMENT DIVISION. [Fv,`*/sm
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DATA DIVISION. !^v~hD$_q
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PROCEDURE DIVISION. @A(jo 32
DISPLAY "Hello, world!". C5$?Y8B3
STOP RUN. -P&