“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。 4&6cDig7*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》。 6S(`Bw8h
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以下是用不同语言写成的Hello World程序的几个例子: $A(3-n5=
Ada Exat_ L'?
with Ada.Text_Io; use Ada.Text_Io; 4dh>B>Q
procedure Hello is b}N\h<\G
begin f_:>36{1^!
Put_Line ("Hello, world!"); >( sS4_O7N
end Hello; 9 I&[6}
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汇编语言 UG6\OgkL+
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x86 CPU,DOS,TASM paxZlA
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MODEL SMALL #EH\Q%
IDEAL BpF}H^V-
STACK 100H q z!^<
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lDs C>L-F
DATASEG qtP*O#1q
HW DB 'Hello, world!$' CT|H1Ry2T
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CODESEG V{rQ@7SE
MOV AX, @data kioIyV\=
MOV DS, AX yT(86#st
MOV DX, OFFSET HW Mv7tK
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MOV AH, 09H ~"h V-3U
INT 21H `Cu9y+t
MOV AX, 4C00H .;D'
INT 21H fY|vq
amA;
END ~ \c
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x86 CPU,GNU/Linux,NASM ww\2
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). mNX0BZ
;Enter this into "hello.asm" then type: 1DF8-|+
;"nasm -f elf hello.asm" X)8Edw[?N3
;"ld hello.o -o hello" i2\CDYP
;"./hello" \9}-5
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section .data ;data section declaration tTJ$tx
msg db 'Hello World!',0AH <-Ax)zE
len equ $-msg ;string length RLDu5
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section .text ;code section declaration Fk?KR
global _start ;entry point (start of execution) HA0yX?f]
_start: mov edx,len ;string length U,aMv[Z B
mov ecx,msg ;string start hllb\Y)XL
mov ebx,1 ;file handle: stdout D,s[{RW+q
mov eax,4 ;sys_write Btc[
int 80h ;kernel system call "VAbUs
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mov ebx,0 ;return value 6V1
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mov eax,1 ;sys_exit }oii|=,#^
int 80h ;kernel system call
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x86 CPU,Windows,MASM32 xf{=~j/L
.386 X-%91z:o58
.model flat,stdcall LM".]f!,
option casemap:none XJ3aaMh"
;Include 文件定义 Aac7km
include windows.inc qp]sVY
include user32.inc 4WQ
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includelib user32.lib YMn=9EUp
include kernel32.inc ]T>YYz
includelib kernel32.lib x}N1Wl=8g
;数据段 &)EL%o5
.data S,C/l1s
szCaption db 'A MessageBox!',0 8noo^QO
szText db 'Hello,world!',0 v1E(K09h2
;代码段 JRw)~Tg @
.code zZ])G
start: 46c0;E\9
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ?qtL*;
invoke ExitProcess,NULL BCr*GtR)W
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end start SJ:Wr{ Or3
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BEGIN { print "Hello, world!" } $yMNdBI[
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传统版BASIC(例如GWBASIC): cX48?srG
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10 PRINT "Hello, world!" Pv3 e*I((
20 END -O[9{`i]
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或在提示符输入: kL%o9=R1
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?"Hello, world!":END |B@\Nf7
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现代版BASIC(例如Quick BASIC): b_oUG_B3]
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Print "Hello, world!" Z`'&yG;U
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以下的语句在Quick BASIC中同样有效: ZRoOdo94
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? "Hello,world!" MY>o8A
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BCPL $:0?"?o);
GET "LIBHDR" ZDl(q~4?z
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LET START () BE dn=g!=
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WRITES ("Hello, world!*N") iYzm<3n?
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#include <stdio.h> 28PT19&
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int main(void) 5oE!^bF?
{ POc-`]6<F
printf("Hello, world!\n"); Q:!.YSB
return 0; 0p'=Vel{}
} lzStJ,NPqn
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C++ Z3
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#include <iostream> X'h
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int main() @-Js)zcl q
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std::cout << "Hello, world!" << std::endl; O&u[^s/^
return 0; a).bk!G
} +MP`iuDO
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int main() $^4URH
{ C@L8,Kj ~.
System::Console::WriteLine("Hello, world!"); ]za1=~[
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C# (C Sharp) hZ@Wl6FG;
class HelloWorldApp Fi^Q]9.@{
{ @.Pe.\Z
public static void Main() -Am~CM
{ S+EC!;@Xg
System.Console.WriteLine("Hello, world!"); -h<Rby
} SMdQ,n1]
} amK.H"
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