“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。 <n#phU Q
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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》。 L>trLD1pt
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以下是用不同语言写成的Hello World程序的几个例子: F,hiKq*
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with Ada.Text_Io; use Ada.Text_Io; , ZisJksk
procedure Hello is #\P\(+0K
begin ]TE(:]o7V
Put_Line ("Hello, world!"); DJWm7 t
end Hello; yW=I*f
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汇编语言 'R-Ly^:Qd
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x86 CPU,DOS,TASM N}|<P[LW
MODEL SMALL g$^:2MT"aQ
IDEAL 1')_^]
STACK 100H [ClDKswq
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DATASEG H$@5\pP>
HW DB 'Hello, world!$' \]:}lVtxS
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CODESEG "d5nVO/
MOV AX, @data H\>0jr`
MOV DS, AX rd
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MOV DX, OFFSET HW G5l?c@o
MOV AH, 09H uGoySt&;(
INT 21H Bd++G'FZ
MOV AX, 4C00H sxK|0i}6
INT 21H tyI!y~-z
END $`a>y jma
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x86 CPU,GNU/Linux,NASM q
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;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). w=;Jj7}L
;Enter this into "hello.asm" then type: %&Fsk]T%:
;"nasm -f elf hello.asm" z+5ZUS2~&
;"ld hello.o -o hello" `)aIFAW
;"./hello" mm1fG4
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section .data ;data section declaration $n><p>`
msg db 'Hello World!',0AH qH=<8Iu
len equ $-msg ;string length )0 1,3J>#
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section .text ;code section declaration u4KP;_,m
global _start ;entry point (start of execution) #$dEg
_start: mov edx,len ;string length !T|q/ri
mov ecx,msg ;string start X]1Q# $b
mov ebx,1 ;file handle: stdout }Sx+: N*
mov eax,4 ;sys_write uHQf <R$:
int 80h ;kernel system call W5SCm(QS5
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mov ebx,0 ;return value hI#1Ybl
mov eax,1 ;sys_exit }x~1w:zHd
int 80h ;kernel system call Lw1aG;5
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x86 CPU,Windows,MASM32 2zPO3xL,
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.model flat,stdcall a5dc#f
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option casemap:none o0)k5P~<~
;Include 文件定义 Lu.C+zgQ
include windows.inc @ L=dcO{r
include user32.inc K2o\+t
includelib user32.lib US'rhSV
include kernel32.inc Chs#}=gzi
includelib kernel32.lib w9aLTLv-
;数据段 B)`@E4i
.data N?3BzI%?
szCaption db 'A MessageBox!',0 AzZb0wW6p
szText db 'Hello,world!',0 q(XO_1W0V
;代码段 oro^'#ki
.code DkA@KS1Dq
start: ,7/F?!G!J
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK s#*
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invoke ExitProcess,NULL %+bw2;a6
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end start P$H9
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BEGIN { print "Hello, world!" } [dIlt"2fV
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BASIC 9`FPV`/
传统版BASIC(例如GWBASIC): t,IQ|B&0
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10 PRINT "Hello, world!" XIRvIwO
20 END mzbMX
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或在提示符输入: INF}~DN]
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?"Hello, world!":END VSDG_:!K
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现代版BASIC(例如Quick BASIC): "V3f"J?
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Print "Hello, world!" &57s//PrX
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以下的语句在Quick BASIC中同样有效: #HyE-|_C
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? "Hello,world!" qZB}}pM#
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GET "LIBHDR" ZQN%!2
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LET START () BE J5#shs[M:
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WRITES ("Hello, world!*N") mIYM+2p
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#include <stdio.h> \ ~uY);
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int main(void) h/xV;oj
{ Kn`-5{1B|
printf("Hello, world!\n"); 586lN22xM
return 0; <E1ngG
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#include <iostream> 7 P/1'f3
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int main() LG:Mksd8=4
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std::cout << "Hello, world!" << std::endl; bU{lV<R,
return 0; `S:LuU8e
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int main() d45mKla(V
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System::Console::WriteLine("Hello, world!"); +I[Hxf ~
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class HelloWorldApp 'E_~>
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public static void Main() .u^4vVz
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System.Console.WriteLine("Hello, world!"); yd~}CF
} P{[@t_
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