“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。 8pmWw?
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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》。 K/&
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以下是用不同语言写成的Hello World程序的几个例子: 'fb&3
Ada <Rt0
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with Ada.Text_Io; use Ada.Text_Io; ziAn9/sT
procedure Hello is P@etT8| V
begin V2Z^W^
Put_Line ("Hello, world!"); +5ql`C
end Hello; nCldH|>5w
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汇编语言 i;2V
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x86 CPU,DOS,TASM q!d7Ms{q
MODEL SMALL 8LtkP&Wx
IDEAL Lz-(1~o
STACK 100H 17rg!'+
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DATASEG (i)O@Jve
HW DB 'Hello, world!$' \a:-xwUu<
u_=>r_J[b
CODESEG t-FrF </0
MOV AX, @data \n0Gr\:
MOV DS, AX O sIvW'$\
MOV DX, OFFSET HW gA+@p'XnR
MOV AH, 09H Jl)Q#
INT 21H \p iz Vt
MOV AX, 4C00H b<g9L4s
INT 21H h>NuQo*
END *fDhNmQ `
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x86 CPU,GNU/Linux,NASM jW|M)[KJN
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). [MM`#!K%
;Enter this into "hello.asm" then type: uY)|
;"nasm -f elf hello.asm" j&?@:Zg v
;"ld hello.o -o hello" 0bIhP,4&
;"./hello" grCz@i
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section .data ;data section declaration o
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msg db 'Hello World!',0AH :2&W9v
len equ $-msg ;string length 4H%Ai(F}_
/;1h-Rc>
section .text ;code section declaration ID=^497
global _start ;entry point (start of execution) WGMEZx
_start: mov edx,len ;string length ADZU?7)
mov ecx,msg ;string start w#$Q?u ,G
mov ebx,1 ;file handle: stdout =
:\o/)+
mov eax,4 ;sys_write _AVP1
int 80h ;kernel system call ~p/1
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mov ebx,0 ;return value oGZ%w4T
mov eax,1 ;sys_exit lGN{1djT
int 80h ;kernel system call [)p>pA2GZj
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x86 CPU,Windows,MASM32 bu r0?q
.386 TqXB2`7Ri
.model flat,stdcall t'Pn*
option casemap:none "f`{4p0v
;Include 文件定义 n#5%{e>
include windows.inc QK/~lN
include user32.inc FAd4p9[Y
includelib user32.lib }7|UA%xz
include kernel32.inc _"c?[n
includelib kernel32.lib PeB7Q=d)K1
;数据段 ER$qL"H
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.data +dSO?Y]
szCaption db 'A MessageBox!',0 Xkb\fR6<K
szText db 'Hello,world!',0 -Fs<{^E3j
;代码段 9rhl2E
.code ;l=ZW
start: +(|
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK lK3Z}e*eXQ
invoke ExitProcess,NULL (E?X@d iu
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> L,wEUI
end start jG&gd<^
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BEGIN { print "Hello, world!" } OuF%!~V
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BASIC
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传统版BASIC(例如GWBASIC): La'XJ|>V
u IGeSd5B
10 PRINT "Hello, world!" %oE3q>S$en
20 END S+&Bf ~~D
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或在提示符输入: Ves
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?"Hello, world!":END P+nd?:cz
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现代版BASIC(例如Quick BASIC): i_6 Y6
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Print "Hello, world!" aoVfvz2Y
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以下的语句在Quick BASIC中同样有效: {]6Pd`-
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? "Hello,world!" u
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BCPL m3E`kW|
GET "LIBHDR" %ryYa
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LET START () BE E1-BB
$( y)e8pPDG
WRITES ("Hello, world!*N") ]3iQpL
$) i917d@r( <
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Befunge %^CoWbU
"!dlrow olleH">v -'mTSJ.}
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Brainfuck eQqx0+-0c
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< oF0BBs$
+++++++++++++++.>.+++.------.--------.>+.>. p`-Oz]
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C nkn4VA?"
#include <stdio.h> u#"L gG.X
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int main(void) AeN$AqQd/
{ \=NS@_t,
printf("Hello, world!\n"); {N2MskK
return 0; 84}Pu%
} tlJ@@v&=
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C++ Qaeg3f3F3
#include <iostream> .Do(iYO.L
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int main() 70BLd(?
{ 7uW=f kxT
std::cout << "Hello, world!" << std::endl; +<1MY'>y
return 0; zt|DHVy
} g ONybz6]
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C++/CLI .ZK^kcyA
int main() /\0g)B;]
{ }lP'bu
System::Console::WriteLine("Hello, world!"); he\ pW5p
} LX2Re
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C# (C Sharp) _aj,tz
class HelloWorldApp yT<