“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。 d0^2<
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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》。 !jbjrzv9
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以下是用不同语言写成的Hello World程序的几个例子: 34=0.{qn
Ada hTm}j,H
with Ada.Text_Io; use Ada.Text_Io; i&$uG[&P
procedure Hello is ;D1IhDC
begin f/x "yUq
Put_Line ("Hello, world!"); +9X[gef8
end Hello; LcXMOT)s
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汇编语言 4=Ey\Px
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x86 CPU,DOS,TASM {E/TC%
MODEL SMALL ?MH4<7?"
IDEAL hqPn~Tq
STACK 100H |@BN+o;`Om
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DATASEG b nGA.b
HW DB 'Hello, world!$' b5Pn|5AVj
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CODESEG 6{'6_4;Fv(
MOV AX, @data V1.F`3h~
MOV DS, AX +b+sQ<w?.
MOV DX, OFFSET HW u$#7W>R
MOV AH, 09H :!$z1u8R
INT 21H {P&^Erx
MOV AX, 4C00H 919g5f`
INT 21H ''uI+>Y
END w>uZ$/
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x86 CPU,GNU/Linux,NASM U[l%oLra
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). mx~sxYa
;Enter this into "hello.asm" then type: )*h~dx_c m
;"nasm -f elf hello.asm" @
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;"ld hello.o -o hello" <q\)
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;"./hello" 2(Uz9!<V
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section .data ;data section declaration _eV n#!|
msg db 'Hello World!',0AH vc#oALc&
len equ $-msg ;string length -G#k/Rz6
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section .text ;code section declaration PU5mz.&0'
global _start ;entry point (start of execution) :-La
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_start: mov edx,len ;string length 4Z9wzQ>
mov ecx,msg ;string start Z4ioXl
mov ebx,1 ;file handle: stdout {yMA7W7]
mov eax,4 ;sys_write o'/C$E4W
int 80h ;kernel system call x9l0UD*+g
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mov ebx,0 ;return value *Ne&SXg
mov eax,1 ;sys_exit :xS&Y\ry
int 80h ;kernel system call m,C,<I|'d
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x86 CPU,Windows,MASM32 ih |Ky+ !
.386 dqA[|bV
.model flat,stdcall jUvA<r
option casemap:none D"4&9"C U
;Include 文件定义 cuaNAJ
include windows.inc /I'u/{KB
include user32.inc (0#F]""\e
includelib user32.lib Q4Fq=kTE
include kernel32.inc NLZZMr
includelib kernel32.lib fGf-fh;s
;数据段 8<g#$(a_E
.data Q &7)vs
szCaption db 'A MessageBox!',0 R{uJczu
szText db 'Hello,world!',0 q%k(M[
;代码段 dIpW!Pj^
.code 1"&;1Ts
start: xX/s1(P
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK IAF;mv}'
invoke ExitProcess,NULL Secq^#]8
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> xVkTRCh
end start MiH}VfI
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BEGIN { print "Hello, world!" } 'K`Rbhy
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BASIC I+"?,Ej$K
传统版BASIC(例如GWBASIC):
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10 PRINT "Hello, world!" p&sK\
20 END VkDS&g~Ws
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或在提示符输入: MATgJ`lsy
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?"Hello, world!":END mPfUJ#rS
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现代版BASIC(例如Quick BASIC): 6UW:l|}4#2
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Print "Hello, world!" uR:=V9O
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以下的语句在Quick BASIC中同样有效: m
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? "Hello,world!" Bhu@ 2KdA
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BCPL z_Wm
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GET "LIBHDR" Yn4)Zhkk
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LET START () BE n{^<&GWox
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WRITES ("Hello, world!*N") q11QAx4p
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#include <stdio.h> F_nZvv[H?
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