“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。 {Sd@u$&
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 <8F->k1"3
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以下是用不同语言写成的Hello World程序的几个例子:
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Ada I1eb31<
with Ada.Text_Io; use Ada.Text_Io; hr/xpQW
procedure Hello is oT9XJwqnv
begin C9"f6>i
Put_Line ("Hello, world!"); UgOGBj,&5W
end Hello; pn ~/!y
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汇编语言 "GIg|3
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x86 CPU,DOS,TASM VNOK>+
MODEL SMALL LN,$P
IDEAL Zp% ""
STACK 100H @E&X&F%
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DATASEG Q!BkS=H30K
HW DB 'Hello, world!$' Q@3ld6y
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CODESEG hs -}:^S`
MOV AX, @data #U6/@l)
MOV DS, AX 93zlfLS0
MOV DX, OFFSET HW g:@Cg.q8
MOV AH, 09H |zr)hC
INT 21H IArpCF/"8
MOV AX, 4C00H O(c4iWm
INT 21H {<Xo,U7y
END .q|xMS}4
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x86 CPU,GNU/Linux,NASM V.E.~<7D\
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Q
xj|lr
;Enter this into "hello.asm" then type: 6i?kkULBS
;"nasm -f elf hello.asm" `"bRjC"f]
;"ld hello.o -o hello" B4M'Er{v
;"./hello" <try%p|f
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section .data ;data section declaration $yxIE}
msg db 'Hello World!',0AH <)0LwkFtB
len equ $-msg ;string length 4^jZv$l5
plz=G}Y
section .text ;code section declaration U`vt/#j
1
global _start ;entry point (start of execution) }gi`?58J6
_start: mov edx,len ;string length @Z1?t%1
mov ecx,msg ;string start ua. 6?W)
mov ebx,1 ;file handle: stdout I{X@<o}
mov eax,4 ;sys_write \C'I l
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int 80h ;kernel system call 16d{IGMz
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mov ebx,0 ;return value `zvT5=*-#
mov eax,1 ;sys_exit u.xA}yVS
int 80h ;kernel system call U%SNROj
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0 ^-b}
x86 CPU,Windows,MASM32 iaq:5||,
.386 ES:p^/ =*
.model flat,stdcall *^&iw$Qx3
option casemap:none 36D,el In
;Include 文件定义 ?),K=E+=U
include windows.inc 5D q{"@E
include user32.inc cR@}
includelib user32.lib T J"{nB
include kernel32.inc :[$i~V
includelib kernel32.lib u{y5'cJ{
;数据段 {3yws4
.data H"Em|LX^
szCaption db 'A MessageBox!',0 #7E&16Fk
szText db 'Hello,world!',0 5tbiNm^X
;代码段 y5opdIaT
.code h11bK'TIv
start: f<xt3
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK n*]x02:LjZ
invoke ExitProcess,NULL A5J#x6@
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> rt4|GVa
end start epm8N /
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BEGIN { print "Hello, world!" } 9#A{C!75(y
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BASIC )-7(Hv1
传统版BASIC(例如GWBASIC): ?(XX
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10 PRINT "Hello, world!" ,jdKcWy'
20 END bgx5{!A
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或在提示符输入: @zpHemdB
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?"Hello, world!":END "nS{
;:
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现代版BASIC(例如Quick BASIC): Pp" )hFx
#p^pvdvh3
Print "Hello, world!" l'X?S(fiV
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以下的语句在Quick BASIC中同样有效: L?pvz}
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? "Hello,world!" ,@j&q
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BCPL /-} p7AM
GET "LIBHDR" dXr
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LET START () BE mm~o%1|WR
$( 7B> cmi
WRITES ("Hello, world!*N") 1F%*k &R
$) 9hi(P*%q
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;?[ +vf")
Befunge ^*T{-U'
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++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< 4rCqN.J
+++++++++++++++.>.+++.------.--------.>+.>. e2H'uMy;&
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C j-\^
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#include <stdio.h> +=F);;!
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int main(void) ZtZV:re=
{ Ib<+m%Ac
printf("Hello, world!\n"); 6j.(l4}
return 0; 4zvU"np
} F;l<>|vG
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C++ Z)>a6s$ih<
#include <iostream> q+=@kXs>+
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C
int main() bSKV|z/x
{ I;PO$T
std::cout << "Hello, world!" << std::endl; d3hTz@JY
return 0; BwA~*5TFu
} N1zrfn-VU
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C++/CLI $zH0$aOx
int main() 2G*#Czr"
{ `e:RZ
System::Console::WriteLine("Hello, world!"); *" +cP!
} rb4g<f|
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C# (C Sharp) 8&iI+\lCy
class HelloWorldApp ))-M+CA
{ dQoMAsxzM
public static void Main() H_^u_%:e
{ 6aK2{-+
System.Console.WriteLine("Hello, world!"); tWy<9TF
} 'cCj@bZ9X
} [_B&7#3>7
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IDENTIFICATION DIVISION. JqIv&W