“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。 EEj.Kch}4
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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》。 ;><m[ l6
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以下是用不同语言写成的Hello World程序的几个例子: ygYy [IZ
Ada -qdt$jIM
with Ada.Text_Io; use Ada.Text_Io; ?OVje9
procedure Hello is f}w_]l#[G
begin V3q[$~9
Put_Line ("Hello, world!");
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end Hello; WlmkM?@
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汇编语言 ,#K{+1z:
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x86 CPU,DOS,TASM !TLJk]7uC
MODEL SMALL >1RL5_US
IDEAL b!`{fwV
STACK 100H C{OkbE"Vym
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DATASEG ~9n30j%]s
HW DB 'Hello, world!$' 1x^Vv;K
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CODESEG 4OFv#$[
MOV AX, @data Ik-E_U2
MOV DS, AX .Ky)Co
MOV DX, OFFSET HW )
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MOV AH, 09H r0*Y~
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INT 21H 'PWA
MOV AX, 4C00H DcN!u6sJ
INT 21H =:'\wx
X
END
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x86 CPU,GNU/Linux,NASM J;'H],w}f
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ;
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;Enter this into "hello.asm" then type: wU|jw(
;"nasm -f elf hello.asm" n0g8B
;"ld hello.o -o hello" D!&]jkUN
;"./hello" f4$sH/ 2#v
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section .data ;data section declaration w@pJ49
msg db 'Hello World!',0AH J vq)%t8q>
len equ $-msg ;string length D7=Irz!O\7
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section .text ;code section declaration a[p$e?gka
global _start ;entry point (start of execution) 8*Ty`G&v
_start: mov edx,len ;string length 8.Ufw.
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mov ecx,msg ;string start 8Oz9 UcG
mov ebx,1 ;file handle: stdout 6q^\pJY%&7
mov eax,4 ;sys_write m|3Q'
int 80h ;kernel system call 6-FM<@H{
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mov ebx,0 ;return value ~RLWr.pK
mov eax,1 ;sys_exit I51I(QF=
int 80h ;kernel system call b[<L
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x86 CPU,Windows,MASM32 >Y(JC#M;
.386 5)A[NTNJx
.model flat,stdcall 0s79rJ
option casemap:none _D$1CaAYo
;Include 文件定义 m_.9PZ
include windows.inc Lp/'-Y_
include user32.inc hV:++g
includelib user32.lib AN3oh1xe:
include kernel32.inc g)=$zXWhP
includelib kernel32.lib O p1TsRm5L
;数据段 ix$
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.data P^!g0K
szCaption db 'A MessageBox!',0 bR,Es~n
szText db 'Hello,world!',0 Y=?{TX=6<[
;代码段 'n=bQ"bQu
.code I L,l XB<
start: /GX>L)
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK |}UA=? Xl
invoke ExitProcess,NULL g
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end start H4sW%nZ0
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BEGIN { print "Hello, world!" } Hzj8o3
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BASIC 5D2mZ/
传统版BASIC(例如GWBASIC): w>8kBQ?b
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10 PRINT "Hello, world!" 6212*Z_Af
20 END A FBH(ms't
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或在提示符输入: SP/b4
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?"Hello, world!":END IZm6.F
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现代版BASIC(例如Quick BASIC):
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Print "Hello, world!" ah
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以下的语句在Quick BASIC中同样有效: +H?g9v40
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? "Hello,world!" ,A7:zxnc.V
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BCPL @*~yVV!5
GET "LIBHDR" *0Z6H-Do,
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LET START () BE G_5{5Ar
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WRITES ("Hello, world!*N") 9H;Os:"\|
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Befunge fa,:d8
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C /DH`7E
#include <stdio.h> :Zkjtr.\
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int main(void) :UH*Wft1
{ K3h];F!^
printf("Hello, world!\n"); K$D+TI)
return 0; ^Ss<<
} .#Z'CZO|
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C++ Iurz?dt4w
#include <iostream> mZ? jpnd
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int main() ]j,o!|rx7
{ g8&& W_BI
std::cout << "Hello, world!" << std::endl; g'T L`=O
return 0; i !sVQ(:
} PBW_9&