“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。 ?O?~|nI
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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》。 LeCU"~
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以下是用不同语言写成的Hello World程序的几个例子: !:e
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Ada Qd?P[xm
with Ada.Text_Io; use Ada.Text_Io; 0^z$COCv
procedure Hello is [9^e
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begin jwox?] f+
Put_Line ("Hello, world!"); ,&SJ?XAs
end Hello; G#v7-&Yl6
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汇编语言 I SmnZ@
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x86 CPU,DOS,TASM B)dynGF8i
MODEL SMALL 2ZeL
IDEAL D
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STACK 100H LsV"h<
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DATASEG uBgHtjmae
HW DB 'Hello, world!$' ;8Cqy80K
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CODESEG }tPl?P'`
MOV AX, @data m+"%Jd{q
MOV DS, AX s_TM!LRUcw
MOV DX, OFFSET HW oJ+$&P(
MOV AH, 09H o*xEaD
INT 21H TbuR?#
MOV AX, 4C00H gjV&X N
INT 21H 91XHz14
END '5--eYG
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x86 CPU,GNU/Linux,NASM @Q!j7I
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). :u0433z:
;Enter this into "hello.asm" then type: =I1@ O9}+i
;"nasm -f elf hello.asm" jp]JFh;3
;"ld hello.o -o hello" AtOB'=ph*
;"./hello" ez>@'yhK
RT>3\qhZ
section .data ;data section declaration !@X#{
msg db 'Hello World!',0AH o_n.,=/cZ
len equ $-msg ;string length yw0uF
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section .text ;code section declaration
dp"w=~53
global _start ;entry point (start of execution) Me>'QVr
_start: mov edx,len ;string length DI7trR`
mov ecx,msg ;string start $;1~JOZh
mov ebx,1 ;file handle: stdout 9[*kpMC
mov eax,4 ;sys_write \=<.0K A~
int 80h ;kernel system call 6>Y}2fT}o3
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mov ebx,0 ;return value voxlo>:
mov eax,1 ;sys_exit #a&Vx&7L
int 80h ;kernel system call +!(hd
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x86 CPU,Windows,MASM32 ?H`LrL/k
.386 V1G]LM
.model flat,stdcall !QovpO">z
option casemap:none )94R\f
;Include 文件定义 r%m2$vx#
include windows.inc 2i)y'+s
include user32.inc 1"k@O)?JP
includelib user32.lib :<W8uDAs
include kernel32.inc QI-3mqL
includelib kernel32.lib JoYzC8/r
;数据段 ?cvv!2B]T
.data x1~`Z}LX0
szCaption db 'A MessageBox!',0 r/e&}!
szText db 'Hello,world!',0 (2(hl--'n
;代码段 h:;~)= {"X
.code Ub$$wOsf
start: h4#5j'RO
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK `6A"eDa
invoke ExitProcess,NULL ]Vsze4>Z[
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> c2nZd.SD|
end start >XF@=Jp
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BEGIN { print "Hello, world!" } f19
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BASIC
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传统版BASIC(例如GWBASIC): I2dt#
Fmu R(f=
10 PRINT "Hello, world!" <O WPG,
20 END R Mm`<:H_
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或在提示符输入: ziOmmL(r
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?"Hello, world!":END l>ttxYBa<d
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现代版BASIC(例如Quick BASIC): z 4-wvn<*
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Print "Hello, world!" DM&"oa50
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以下的语句在Quick BASIC中同样有效: CeQcnJU
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? "Hello,world!" ,'j5tU?c
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BCPL 38#(ruv
GET "LIBHDR" bQ)r8[o!
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LET START () BE Rq*m x<HDX
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WRITES ("Hello, world!*N") S:d `z'
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P'K')]D=!
Befunge 4q[r
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Brainfuck =Yfs=+O
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+++++++++++++++.>.+++.------.--------.>+.>. }S&{ &gh
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#include <stdio.h> >3bpa<M_
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int main(void) WC4Il
C
{ FKQnz/
printf("Hello, world!\n"); I/tzo(r
return 0; jsR1jou6
} \ Q6Ip@?
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C++ mVkn~LD:0
#include <iostream> =4I361oMf
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int main() 6Z"%vrH
{ Wp'\NFe8
std::cout << "Hello, world!" << std::endl; D >mLSh
return 0; ;f><;X~KX
} *0U(nCT&m
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C++/CLI ]X5*e'
int main() 3EFk] X
{ (3-G<