“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。 E NjD~ S
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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》。 =(\!,S'
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以下是用不同语言写成的Hello World程序的几个例子: ibw;BU
Ada 1]`HX=cl
with Ada.Text_Io; use Ada.Text_Io; ~-i?=
procedure Hello is ^4NH.q{
begin X
jN.X
Put_Line ("Hello, world!"); '|T=
end Hello; s$6#3%h
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汇编语言 AFED YRX
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x86 CPU,DOS,TASM #9Z-Hd<
MODEL SMALL l si8?91
IDEAL `I$A;OPK7
STACK 100H )v0vdAh'b
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DATASEG ;v\n[
HW DB 'Hello, world!$' +Z*%,m=N(
$)V4Eu;
CODESEG JM%#L *;
MOV AX, @data {{,%p#/b
MOV DS, AX r kl7p?
MOV DX, OFFSET HW 1 Y&d%AA
MOV AH, 09H lR!$+atW
INT 21H (C%'I
MOV AX, 4C00H Tp13V.|
INT 21H _T$\$v$ {
END X;NTz75
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x86 CPU,GNU/Linux,NASM f14c}YY
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). }^q#0`e(y
;Enter this into "hello.asm" then type: (Q+3aEUE
;"nasm -f elf hello.asm" 9h{G1XL
;"ld hello.o -o hello" _JH6bvbQ
;"./hello" %ZK}y{u\
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section .data ;data section declaration (1^(V)@
msg db 'Hello World!',0AH |*$_eb
len equ $-msg ;string length n6f|,D!?
*&D=]fG
section .text ;code section declaration -E7\.K3
global _start ;entry point (start of execution) 25L{bcng
_start: mov edx,len ;string length KX`,7-
mov ecx,msg ;string start e
j9G[
mov ebx,1 ;file handle: stdout |.A>0-']M
mov eax,4 ;sys_write jo~Pr
int 80h ;kernel system call #,56vVY
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mov ebx,0 ;return value 51vK>
mov eax,1 ;sys_exit :y)'qv[
int 80h ;kernel system call FcA0 \`0M
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x86 CPU,Windows,MASM32 ]O."M"B
.386 kokkZd7!
.model flat,stdcall w3@te\
option casemap:none x-<dJ}`
;Include 文件定义 jo^*R'}
include windows.inc ?6dtvz;K+?
include user32.inc k$UBZ,=iC
includelib user32.lib DYS(ZY)4
include kernel32.inc &ly[mBP~
includelib kernel32.lib Tx5L
;数据段 ect?9S[!y
.data ,#G@ri:B
szCaption db 'A MessageBox!',0 pK4)>q
szText db 'Hello,world!',0 _OY ;SJ(
;代码段 LjH];=R
.code ZeO>Ag^
start: D fea<5~^z
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK `4CRpz
invoke ExitProcess,NULL <T wq{kt
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> /2:r}O
end start MD7[}cB
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BEGIN { print "Hello, world!" } \ *2IU"R
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BASIC 0`W~2ai
传统版BASIC(例如GWBASIC): OjN]mp-q
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10 PRINT "Hello, world!" <7GK *I
20 END jK =[
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或在提示符输入: _KFKx3<m!
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?"Hello, world!":END <L J$GiU
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现代版BASIC(例如Quick BASIC): t`AD9
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Print "Hello, world!" CqoL5qt
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以下的语句在Quick BASIC中同样有效: EY>A(
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? "Hello,world!" g=pDC+
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BCPL 4Z_.Jdu w
GET "LIBHDR" >b?,zWiw
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LET START () BE
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$( _VlNZ/V
WRITES ("Hello, world!*N") v%1# y5
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Befunge g5E]o)
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C M;(lc?Rv
#include <stdio.h> O7.Is88!
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int main(void) 982$d<0%
{ _ehU:3L`s
printf("Hello, world!\n"); w
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return 0; ESs)|t h
} $d"6y
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C++ 5`+*({
#include <iostream> 9J?j2!D
3] !(^N>V
int main() r[gV`khka
{ .,c8cq?
std::cout << "Hello, world!" << std::endl; ;7hf'k
return 0; rdK.*oT
} a%AU9?/q#
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C++/CLI PH]q#/'
int main() H`y- "L8q
{ `mMD e
System::Console::WriteLine("Hello, world!"); /`1zkBj<&
} GL /\uq
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C# (C Sharp) JK1b68n
class HelloWorldApp I[&!\Me[+w
{ t*DM^.@
public static void Main() F/!C=nS
{ m:h]nm
System.Console.WriteLine("Hello, world!"); s8tI_h
} mb&b