“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。 {<~0nLyJS
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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》。 KNU/Kc#
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以下是用不同语言写成的Hello World程序的几个例子: $|.x !sA
Ada j"o`K}C
with Ada.Text_Io; use Ada.Text_Io; J 2%^%5&0
procedure Hello is dDN#>|
begin 2<}^m/}
Put_Line ("Hello, world!"); cSCO7L2E18
end Hello; ,>CFw-Nxu
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汇编语言 ey<u
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x86 CPU,DOS,TASM m`C(y$8fU
MODEL SMALL V x1C4
IDEAL j &)Xi^^
STACK 100H [0CoQ5:d?&
b)@%gS\F
DATASEG r$=MBeT
HW DB 'Hello, world!$' _F
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CODESEG jEfrxlj
MOV AX, @data .!0),KmkK
MOV DS, AX PETrMu<
MOV DX, OFFSET HW V ~w(^;o@
MOV AH, 09H Ixm<wKwW#
INT 21H {:40Jf
MOV AX, 4C00H qF=D,Dlz
INT 21H P8!Vcy938
END CYrVP%xRA
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x86 CPU,GNU/Linux,NASM X>OO4SV
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Acr\2!))
;Enter this into "hello.asm" then type: dA>t
;"nasm -f elf hello.asm" r/=v;4.W
;"ld hello.o -o hello" !q~s-~d^
;"./hello" W"4E0!r
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section .data ;data section declaration E&V"z^qs_
msg db 'Hello World!',0AH ~PaD _W#xP
len equ $-msg ;string length 'qQ 5K
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section .text ;code section declaration @& #df
global _start ;entry point (start of execution) %lz \w{
_start: mov edx,len ;string length UK+;/Mtg
mov ecx,msg ;string start 1C+Y|p?KA
mov ebx,1 ;file handle: stdout |J2_2a/"
mov eax,4 ;sys_write a*hOT_;#
int 80h ;kernel system call ]O',Ei^
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mov ebx,0 ;return value XyJ*>;q
mov eax,1 ;sys_exit le yhiL<
int 80h ;kernel system call CJg &
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x86 CPU,Windows,MASM32 6~?7CK
.386 /S1EQ%_
.model flat,stdcall r<V]MwO=
option casemap:none >
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;Include 文件定义 ElhTB
include windows.inc x*}j$n( Oa
include user32.inc `x$d8(1J`#
includelib user32.lib `48jL3|
include kernel32.inc
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includelib kernel32.lib M_+&XLnzsJ
;数据段 !y$Hr[v
.data W?~G_4
szCaption db 'A MessageBox!',0 q,VJpqQ
szText db 'Hello,world!',0 3 1KMn
;代码段
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.code @gENv~m<OI
start: )u ]J`.OA
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK '|&}rLr:+
invoke ExitProcess,NULL w{)*'8oCB
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> f!ehq\K1k
end start ZT4._|2
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BEGIN { print "Hello, world!" } K@U"^
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传统版BASIC(例如GWBASIC): (G<"nnjK
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10 PRINT "Hello, world!" LSlaz
20 END x,IU]YW@
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或在提示符输入: "5Oog<
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?"Hello, world!":END *CA|}l
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现代版BASIC(例如Quick BASIC): H`]nY`HYg
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Print "Hello, world!" |;'V":yDs
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以下的语句在Quick BASIC中同样有效: w7p%6m
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? "Hello,world!" y;Q_8|,F
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BCPL ]8ua>1XS
GET "LIBHDR" E:xpma1Qf
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LET START () BE }cgEC-
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WRITES ("Hello, world!*N") )XMSQ ="m
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Befunge Sd'
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#include <stdio.h> af\>+7x93
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int main(void) m46Q%hwV
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printf("Hello, world!\n"); \E9Z
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return 0; r1EccY
} gR.zL>=_5e
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C++ x?KgEcnw2X
#include <iostream> s6OnHX\it7
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int main() Vi23pDZ5
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std::cout << "Hello, world!" << std::endl; o; {
return 0; TU$/3fp*
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int main() Bt[`p\p@
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System::Console::WriteLine("Hello, world!"); 3qiE#+dC
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C# (C Sharp) ^)rX27!G
class HelloWorldApp <oI{:KH
{ w3 PE.A"Q
public static void Main() djS?$WBpU
{ b(_PCVC
System.Console.WriteLine("Hello, world!"); ( u@[}!
} bRJYw6oA<
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COBOL dI5Z*"`R9
IDENTIFICATION DIVISION. lu`\6
PROGRAM-ID. HELLO-WORLD. ^HLi1w|
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ENVIRONMENT DIVISION. zKe&*tZ
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DATA DIVISION. Z{EHV7
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PROCEDURE DIVISION. C<r7d [
DISPLAY "Hello, world!". @ z#;O2
STOP RUN. `i8osX[ &p
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Common Lisp ~7Kqc\/H&I
(format t "Hello world!~%") bENfEOf,
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DOS批处理 &}nU#)IX
@echo off \OHsCG27
echo "Hello, world!" i^G/)bq
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