“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。 gt t$O
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 g0:4zeL
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以下是用不同语言写成的Hello World程序的几个例子: mTuB*
Ada
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with Ada.Text_Io; use Ada.Text_Io; PVkN3J
procedure Hello is u0oYb_Yv
begin 6nWx>R<
Put_Line ("Hello, world!"); :rs\ydDUF
end Hello; /4B4IT
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汇编语言 )Y,?r[4{
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x86 CPU,DOS,TASM }jY[| >z
MODEL SMALL cVHE}0Xd(
IDEAL R$;&O.
5M
STACK 100H YT(1
"{:
xm10
DATASEG % 6hw
HW DB 'Hello, world!$' Y7t{4P
C}P
\kDM
CODESEG ?'/5%f`
MOV AX, @data T;[c<gc/
MOV DS, AX , w'$T)
MOV DX, OFFSET HW ~h^}W$pO
MOV AH, 09H ?.Yw%{?TG
INT 21H ;`PkmAg
MOV AX, 4C00H PSQ:'
INT 21H `)C`_g3Ew
END CpqSn/
v yLAs;
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x86 CPU,GNU/Linux,NASM F/od,w9_
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ~q T1<k
;Enter this into "hello.asm" then type: yDyeP{
;"nasm -f elf hello.asm" }B
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;"ld hello.o -o hello" Qhr]eu;z
;"./hello" ?^$4)Y>Kf
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section .data ;data section declaration B{o\RNU
msg db 'Hello World!',0AH -J7,Nw
len equ $-msg ;string length c'#J{3d
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section .text ;code section declaration ,f0g|5yDf
global _start ;entry point (start of execution) //u76nQ
_start: mov edx,len ;string length ;{q) |GRF
mov ecx,msg ;string start q>:&xR"ra
mov ebx,1 ;file handle: stdout E e\-q
mov eax,4 ;sys_write )4_6\VaM
int 80h ;kernel system call //5_E7Ehu$
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mov ebx,0 ;return value Ufe
mov eax,1 ;sys_exit :9
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int 80h ;kernel system call +ZA\M:^b
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x86 CPU,Windows,MASM32 Cz);mOb%M%
.386 y3[)zv
.model flat,stdcall b
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option casemap:none *;yMD-=
;Include 文件定义 o4 g
include windows.inc {ZM2WFpE
include user32.inc PM<LR?PLc
includelib user32.lib U4L=3T+:[
include kernel32.inc V1 #aDfiW
includelib kernel32.lib v?TJ!o
;数据段 g#%FY1xp
.data %PdYv _5
szCaption db 'A MessageBox!',0 MVv^KezD
szText db 'Hello,world!',0 M@X#[w:
;代码段 8Pdnw/W
.code rHBjR_L.2
start: VrE5^\k<a
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 1LIV/l^}f
invoke ExitProcess,NULL ftH%, /,
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> TIhzMW\/K
end start :;WDPRx
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BEGIN { print "Hello, world!" } Ahbu >LPk
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BASIC \Y[)bo6s
传统版BASIC(例如GWBASIC): (4f9wrK
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10 PRINT "Hello, world!" MVd
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20 END :@Dos'0Px
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或在提示符输入: :Sn3|`HDm
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?"Hello, world!":END [=F
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现代版BASIC(例如Quick BASIC): v]U;5Uo
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Print "Hello, world!" [IBk-opap
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以下的语句在Quick BASIC中同样有效: }/r%~cZ
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? "Hello,world!" s'Q^1oQM2h
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z ;Nk& <?
BCPL R./ 6Q1
GET "LIBHDR" K/+C6Y?
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LET START () BE [gp:nxyfQm
$( Iw7r}G
WRITES ("Hello, world!*N") I8;[DP9
$) i O|,,;_
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Befunge emPm^M5/K
"!dlrow olleH">v 7O^ S.(
, :=eUNH
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+++++++++++++++.>.+++.------.--------.>+.>. &)jZ|Q~
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#include <stdio.h> 9G/2^PI
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int main(void) wu&7#![,
{ *v/*_6f*
printf("Hello, world!\n"); :]QxT8B
return 0; E2kRt'~N
} G@!9)v]9
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C++ >D62l*V C)
#include <iostream> r!,V_a4n
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int main() @2*6+w_Ae
{ tgA
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std::cout << "Hello, world!" << std::endl; Pp hQa!F$
return 0; S9oGf
} ]X|G+[Ujv
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C++/CLI <j3HT"^[D
int main() D07u?
{ *S_Iza #&x
System::Console::WriteLine("Hello, world!"); y<d#sv(s
} Asu"#sd
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C# (C Sharp) <U pjAuG8
class HelloWorldApp uwA3!5
{ TN`:T.B
public static void Main() uI&M|u:nT
{ xR`2+t&t
System.Console.WriteLine("Hello, world!"); j pv,0(
} cSk}53
} ", )
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COBOL @ R Bw T
IDENTIFICATION DIVISION. :zRboqe(cc
PROGRAM-ID. HELLO-WORLD. hz<J8'U
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ENVIRONMENT DIVISION. 0+pJv0u
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DATA DIVISION. BG=_i#V
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}
PROCEDURE DIVISION. Ngnjr7Q={T
DISPLAY "Hello, world!". nB&