“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。 DrKP%BnS
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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》。 L*Tj^q!t+
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以下是用不同语言写成的Hello World程序的几个例子: Jj; L3S
Ada .0zY}`
with Ada.Text_Io; use Ada.Text_Io; }^ApJS(FQ
procedure Hello is Sj%u)#Ub
begin >{q]&}^U
Put_Line ("Hello, world!"); C)um9}
end Hello; faEt6
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汇编语言 0IsPIi"7
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x86 CPU,DOS,TASM wcrCEX=I>{
MODEL SMALL -o^7r@6
IDEAL U$O\f18
STACK 100H m ifxiV
\r/rBa\
DATASEG pj\u9
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HW DB 'Hello, world!$' du<tGsy
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CODESEG G?L HmTHg
MOV AX, @data Lu?C-$a C
MOV DS, AX .p<:II:6
MOV DX, OFFSET HW nD_GL
MOV AH, 09H j@n)kPo,1
INT 21H rMdt:`
MOV AX, 4C00H td(li.,
INT 21H >~''&vdsk\
END z6KCv(zvB
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x86 CPU,GNU/Linux,NASM A!od9W6
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 52@C9Q,
;Enter this into "hello.asm" then type: ]i|h(>QWP
;"nasm -f elf hello.asm" cq,S P&T~
;"ld hello.o -o hello" +^` I?1\UF
;"./hello" QE^$=\l0
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section .data ;data section declaration Zd3S:),&
msg db 'Hello World!',0AH 2Z+Wu3#
len equ $-msg ;string length xs{3pkTYD
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section .text ;code section declaration )1]ZtU
global _start ;entry point (start of execution) 2i)^!c
_start: mov edx,len ;string length bg!/%[ {M
mov ecx,msg ;string start W,K;6TZhh
mov ebx,1 ;file handle: stdout Ansk,$
mov eax,4 ;sys_write 1$xNUsD2
int 80h ;kernel system call h1j!IG
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mov ebx,0 ;return value "Bh}}!13
mov eax,1 ;sys_exit T-'OwCB1q
int 80h ;kernel system call )MtF23k)g
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x86 CPU,Windows,MASM32 .N,bIQnj
.386 57'*w]4f
.model flat,stdcall BGvre'67
option casemap:none FI)17i$
;Include 文件定义 [@&m4 7
include windows.inc %vn|k[nD
include user32.inc 'f#{{KA
includelib user32.lib PIJr{6B/PA
include kernel32.inc K%,2=.
includelib kernel32.lib 4.k0<
;数据段 ?k+xSV
.data [u
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szCaption db 'A MessageBox!',0 X1DF*wI
szText db 'Hello,world!',0 &xU[E!2H%
;代码段 ZJnYIK
.code `"Jj1O@
start: Q$a{\*[:+
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK +! ]zA4x
invoke ExitProcess,NULL DEBB()6,
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> iJ ($YvF4
end start
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BEGIN { print "Hello, world!" } h}>"j%I
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BASIC -Fi`Z$
传统版BASIC(例如GWBASIC): Wvq27YK'
^-TE([ bW
10 PRINT "Hello, world!" l#g\X'bK
20 END Z]A{ d[
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或在提示符输入: M-$%Rzl_
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?"Hello, world!":END h8x MI
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现代版BASIC(例如Quick BASIC): 2A']yD
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Print "Hello, world!" M=8.Bp|Ye
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以下的语句在Quick BASIC中同样有效: ](Xb_xMf
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? "Hello,world!" fnpYT:%fG
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BCPL wVvF^VHV^
GET "LIBHDR" %h hfU6[
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LET START () BE !`M,XSp(
$( 3#WT.4k
WRITES ("Hello, world!*N") h!M
$) T"(&b~m2b4
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dhC$W!N7!
Befunge 0XOp3
"!dlrow olleH">v 1;JEc9#h
, <!&[4-;fU
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S%$ }(
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Brainfuck )~&CvJ
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+++++++++++++++.>.+++.------.--------.>+.>. n|6Ic,:[
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#include <stdio.h> _Ym]Mj' ln
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int main(void) bpOYHc6,*`
{ 'g">LQ~a+
printf("Hello, world!\n"); ):P?
return 0; # ncRb
} l.(v^3:X
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C++ 3(``#7
#include <iostream> FW;m\vu
, |0}<%
int main() .14~J6
{ #F:p-nOq
std::cout << "Hello, world!" << std::endl; 2kqu p)82e
return 0; q'+)t7!
} 7( #:GD
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C++/CLI ['b}QW@Fx
int main() Z/G
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{ w3N[9w?1
System::Console::WriteLine("Hello, world!"); 0}<