“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。 zJe KB8
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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》。 `2mddx8
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以下是用不同语言写成的Hello World程序的几个例子: 2Y
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Ada ge~@}iO@
with Ada.Text_Io; use Ada.Text_Io; *]$B 9zVs!
procedure Hello is DXs an
begin cb}"giXQTB
Put_Line ("Hello, world!"); XUqorE
end Hello; Pq;OShU_
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汇编语言 sg2;"E@
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x86 CPU,DOS,TASM @(t3<g
MODEL SMALL Z>hTL_|]a{
IDEAL }Q\%tZC#T
STACK 100H q~ H>rC(\
x/*lNG/
DATASEG to={q
CqU
HW DB 'Hello, world!$' 82r8K|L.<y
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CODESEG $R9D
L^iD
MOV AX, @data qE[S>/R"
MOV DS, AX ^P)f]GQx
MOV DX, OFFSET HW D|-]<r1"
MOV AH, 09H L5&M@YTH
INT 21H 1-2hh)
MOV AX, 4C00H n(:<pz
INT 21H mUYRioNj
END F-&tSU,
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J<$@X JLS
x86 CPU,GNU/Linux,NASM ARH~dN* C
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). acd[rjeT
;Enter this into "hello.asm" then type: osW"wh_
;"nasm -f elf hello.asm" >B BV/C'9
;"ld hello.o -o hello" kK6OZhLH
;"./hello" E/;t6&6
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section .data ;data section declaration Pfd1[~,
msg db 'Hello World!',0AH FuhmLm'p
len equ $-msg ;string length 0=Z[6Q@:
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section .text ;code section declaration T &ZQie/
global _start ;entry point (start of execution) dWAt#xII
_start: mov edx,len ;string length kf,
&t
mov ecx,msg ;string start Iy<>-e"|
mov ebx,1 ;file handle: stdout >jm(2P(R
mov eax,4 ;sys_write afm\Iv[*
int 80h ;kernel system call LEb$Fd
>)>f~ >
mov ebx,0 ;return value gq=t7b
mov eax,1 ;sys_exit *1|7%*!8
int 80h ;kernel system call ACszx\[K3
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x86 CPU,Windows,MASM32 w"hd_8cO
.386 BU`X_Z1)
.model flat,stdcall -f+#j=FX
option casemap:none JcAsrtrG]
;Include 文件定义 gabfb#
include windows.inc M0V<Ay\%O
include user32.inc Y|Iq~Qy~
includelib user32.lib ]aX@(3G1s
include kernel32.inc $:9t(X)H
includelib kernel32.lib Ak'=l;
;数据段 _imuyt".+
.data {bj!]j
szCaption db 'A MessageBox!',0 #<{v~sVp&
szText db 'Hello,world!',0 MIMC(<
;代码段 X/5m}-6d]
.code `#""JTA"
start: i]8O?Ab>?
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK zakhJ
invoke ExitProcess,NULL 2W AeSUX
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
.-gJS-.c
end start D,#UJPyg
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BEGIN { print "Hello, world!" } = Xgo}g1
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BASIC CPz<iU
传统版BASIC(例如GWBASIC): ?ZF):}rvZ
8$( I! ;
10 PRINT "Hello, world!" gZ @+62
20 END 5EYGA\
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或在提示符输入: fz'qB-F
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?"Hello, world!":END 2 bc&sU)X
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现代版BASIC(例如Quick BASIC): ug3\K83aj/
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Print "Hello, world!" RQVu~7d[
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以下的语句在Quick BASIC中同样有效: b8WtNVd
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? "Hello,world!" <jh4P!\&j
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BCPL [F-R*}&x
GET "LIBHDR" xyL"U*
Z.VKG1e}
LET START () BE T#!>mL|9|
$( d |17G
WRITES ("Hello, world!*N") yw1&I^7
$) ^rWg:fb
atL<mhRz
BP/nK.
Befunge p2vN=[g9)
"!dlrow olleH">v J%"BCbxW~B
, { _9O4 +
&
^_@ =?5)M_6)
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C j|!,^._i
#include <stdio.h> 4BCPh:
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int main(void) =j.TDv'^nd
{ t3<MoDe7`r
printf("Hello, world!\n"); sz9W}&(j
return 0; bzr2Zj{4
} ]$smFF
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C++ t2[/eM.G
#include <iostream> \VpEUU6^U
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int main() jTa\I&s