“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。 p?PK8GL
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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》。 '*lVVeSiFw
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以下是用不同语言写成的Hello World程序的几个例子: ,v ,#f
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Ada Qh3BI?GZ'3
with Ada.Text_Io; use Ada.Text_Io; ZOw%Fw4B
procedure Hello is u0p[ltJ,
begin *MC+i$
Put_Line ("Hello, world!"); qjDt6B^RO
end Hello; wNl{,aH@
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汇编语言 :J6 xYy$
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x86 CPU,DOS,TASM P.aN4 9`=
MODEL SMALL eCFMWFhC
IDEAL maTQ0GX
STACK 100H >\[/e{Q"
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DATASEG H< 51dJn~
HW DB 'Hello, world!$' ^pwT8Bp
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CODESEG ur\<NApT;
MOV AX, @data m55|&Ux|
MOV DS, AX mSeCXCrZlI
MOV DX, OFFSET HW l]R=I2t
MOV AH, 09H YxowArV}uz
INT 21H s_o{w"3X
MOV AX, 4C00H z;iNfs0i$
INT 21H wAD%1;
END l$Y*ii
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x86 CPU,GNU/Linux,NASM ,i)wS1@
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). zCji]:
;Enter this into "hello.asm" then type: 18nT
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;"nasm -f elf hello.asm" 3Zdwt\OQ
;"ld hello.o -o hello" QlE]OAdB42
;"./hello" O#MaZ.=
^m
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section .data ;data section declaration z=/&tRe
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msg db 'Hello World!',0AH D,\hRQ
len equ $-msg ;string length *q; u%; 4
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section .text ;code section declaration }i$ER,hXh
global _start ;entry point (start of execution) QZ&
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_start: mov edx,len ;string length 9$f%
mov ecx,msg ;string start +R"Y~
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mov ebx,1 ;file handle: stdout L9{y1'')
mov eax,4 ;sys_write e1Q
int 80h ;kernel system call 4v.{C"M
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mov ebx,0 ;return value *Za'^ Z2
mov eax,1 ;sys_exit G,!{Q''w
int 80h ;kernel system call G,e!!J
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x86 CPU,Windows,MASM32 @)XR
.386 Tm\a%Z`U>
.model flat,stdcall 8'qq!WR~
option casemap:none /Bq4! n+
;Include 文件定义 y**YFQ*sc
include windows.inc 7bk`u'0%
include user32.inc HSR,moI
includelib user32.lib \AeM=K6q+D
include kernel32.inc ;F|8#! (
includelib kernel32.lib nvB<pSm
;数据段 ?U+nR/H:6
.data DGbEQiX$\
szCaption db 'A MessageBox!',0 _9yW; i-
szText db 'Hello,world!',0 I;Pd}A_}=_
;代码段 yXQ 28A
.code 6t=)1T
start: .WLwAL
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK RiG]-K:
invoke ExitProcess,NULL #+&"m7
s
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> } `Cc-X7
end start <!=:{&d%
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BEGIN { print "Hello, world!" } & LhQr-g
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BASIC k%R(Qga
传统版BASIC(例如GWBASIC): "[ieOFI
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10 PRINT "Hello, world!" {>UT'fa-
20 END .On3ZN
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或在提示符输入: C<#_1@^:8e
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?"Hello, world!":END :}-VLp4b
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现代版BASIC(例如Quick BASIC): IdoS6
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Print "Hello, world!" / hg)=p
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以下的语句在Quick BASIC中同样有效: uuQsK. S
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? "Hello,world!" =)}Yw)
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BCPL 5 qMP u|A
GET "LIBHDR" 1HLU
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LET START () BE @1~cPt
$( LJA
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WRITES ("Hello, world!*N") 1 F&}e&}c
$) 9"?;H%.
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Befunge P{HR='2
"!dlrow olleH">v JkI|Ojmm/
, @"B{k%+
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Brainfuck ]E.\ |I(
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C fZ(k"*\MZ
#include <stdio.h> XP[~ :+
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int main(void) Tv `&
{ .e4upTGU
printf("Hello, world!\n"); +i[@+`
return 0; v|dt[>G
} ~Rx`:kQ
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C++ 9rIv-&7'm
#include <iostream> ixL[(*V
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int main() ^x Z=";eq
{ Uu|2!}^T
std::cout << "Hello, world!" << std::endl; 4b+_|kYb
return 0; 1+[,eq
} +Ht(_+To1
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C++/CLI Q3'P<"u
int main() q;#bFPh
{ -v:3#9uX)
System::Console::WriteLine("Hello, world!"); Md0`/F:+2
} 3[@:I^q
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C# (C Sharp) RU~Pa+H
class HelloWorldApp TEbIU8{Y
{ i6S["\h>
public static void Main() YV'B*arIA
{ Esm=sPW
System.Console.WriteLine("Hello, world!"); P`S'F_IN
} l3y}nh+ 8
} 3BAQ2S}
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