“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。 o^%4w>|
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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》。 K*jV=lG
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以下是用不同语言写成的Hello World程序的几个例子: 5fuOl-M0W
Ada DJP)V8]!B
with Ada.Text_Io; use Ada.Text_Io; ~.7r
procedure Hello is 9MA/nybI
begin v`evuJ\3
Put_Line ("Hello, world!"); YqwDvJWX
end Hello; H~JPsS;
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汇编语言 c<)C3v
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x86 CPU,DOS,TASM |uVhfD=NG
MODEL SMALL OJe#s;oH
IDEAL WL(u'%5
STACK 100H j*aN_UTr3
[4B.;MS(
DATASEG u6h"=l{
HW DB 'Hello, world!$' Rda o
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CODESEG 5-lcz)DO
MOV AX, @data ,9Y{x
MOV DS, AX *kE2d{h^=C
MOV DX, OFFSET HW 7@al)G;~
MOV AH, 09H MFO}E!9`q
INT 21H &o*/6X
MOV AX, 4C00H $$`E@\5P
INT 21H i2`i5&*
END ,y@`=
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x86 CPU,GNU/Linux,NASM C^I h"S
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ciO^2X
;Enter this into "hello.asm" then type: `P}T{!P+6
;"nasm -f elf hello.asm" l1On .s
;"ld hello.o -o hello" @q2If{Tk
;"./hello" ] >-#T
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section .data ;data section declaration zS*GYE(l^
msg db 'Hello World!',0AH ~t\Hb8o
len equ $-msg ;string length BoJ@bOe#
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section .text ;code section declaration ]Ija,C!#
global _start ;entry point (start of execution) r#LoBfM;^A
_start: mov edx,len ;string length o
mstJ9
mov ecx,msg ;string start Ga0=
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mov ebx,1 ;file handle: stdout +*-u_L\'
mov eax,4 ;sys_write Q?rb(u(
int 80h ;kernel system call x"0*U9f
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mov ebx,0 ;return value b$)b/=2
mov eax,1 ;sys_exit kr2V
int 80h ;kernel system call :9!?${4R
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6'd=% V
x86 CPU,Windows,MASM32 JK0L&t<
.386 {#YGor|
.model flat,stdcall $>zLa_cn|
option casemap:none =BO} hk
;Include 文件定义 13(JW
include windows.inc >i=^Mh-bm
include user32.inc oyV@BHJO@
includelib user32.lib +`g&J
include kernel32.inc Z7?C^m
includelib kernel32.lib 7Wub@Mp
;数据段 Q-78B'!=
.data 7KU/ 1l9$9
szCaption db 'A MessageBox!',0 b489sa
szText db 'Hello,world!',0 ~3 4Ly
;代码段 ]5b%r;_
.code %IG cn48J
start: gf2<dEff
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ZVu&q{s,
invoke ExitProcess,NULL .nX+!EXeS
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> PEZ~og:w
end start [|<2BQX
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BEGIN { print "Hello, world!" } Vh1{8'GQ
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BASIC D/pc)3Ofe
传统版BASIC(例如GWBASIC): }WXO[ +l
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10 PRINT "Hello, world!" qXmkeidb&W
20 END $8#zPJR&
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或在提示符输入: X,d`-aKO\y
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?"Hello, world!":END vB >7W
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现代版BASIC(例如Quick BASIC): ek6PMZF:'
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Print "Hello, world!" EJ&[I%jU
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以下的语句在Quick BASIC中同样有效: #xZ7%
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? "Hello,world!" 3D>syf
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BCPL ]&%_Fpx
GET "LIBHDR" ta\AiHm
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LET START () BE tpp. 9
$( =9@{U2 =l
WRITES ("Hello, world!*N") !}fq%8"-
$) 9fR`un)f}
1+6)0 OH{
3}{od$3G
Befunge Yg@k+
"!dlrow olleH">v R<aF;Rvb5
, ]H8,}
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:db:|=#T
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Brainfuck h3y0bV[g=
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< ?.66B9Lld
+++++++++++++++.>.+++.------.--------.>+.>. p%A
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#=r:;,,
C Ng=XH"ce~
#include <stdio.h> qzq_3^66
#T_m|LN7
int main(void) j?sq i9#
{ '?Fw]z1$
printf("Hello, world!\n"); -m*IpDi
return 0; Z%_"-ENT
} M_@%*y\o
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C++ Hbz >D5$
#include <iostream> kc#<Gr&Z&
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int main() P9(]9np,,
{ *3 .+19Q
std::cout << "Hello, world!" << std::endl; S !Dq8
return 0; }c/p+Wo
} wxw3t@%mNm
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C++/CLI Fljqh8c5
int main() m]t`;lr<
{ P~Ss\PT
System::Console::WriteLine("Hello, world!"); 4LY
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} -yKx"Q9F
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C# (C Sharp) [K_v,m]
class HelloWorldApp (6##\}L&